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SRRL BMS Instrument Descriptions and Histories


Model Measurement
Notes (below)		 Units Install
Date		 Removal
Date		 Current
SN		 Current
CF
PSP Global Horizontal (Not Ventilated) W/m2 07/15/1981 12/11/2014 25782F3 RS vs Z (2 degree)
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by an Eppley Laboratory, Inc. Model PSP (Precision Spectral Pyranometer) with calibration factor traceable to the World Radiometric Reference (WRR). As of June 7, 2006, an effective net infrared corrected responsivity function (based on zenith angle) is also applied to the corrected voltage (Vc). Where, Vc = V - Wnet * RSnet, where Wnet = effective net infrared (from the ventilated downwelling PIR) and RSnet = instruments effective net infrared response (derived from NREL black body system). The current coefficients for this function are available from AIM database server. As of June 1, 2012, irradiances without effective net infrared correction and/or non-zenith angle corrected are no longer provided, instead, the raw mV signal is provided. As of December 17, 2013 at 13:57 the responsivity function is replaced with a spline fit to AM/PM averaged 2-degree responsivity data (computed in the CR3000).
NIP Direct Normal (unit 1) W/m2 07/15/1981 - 31137E6 see database (click S/N)
[DQS]
[Maint]		 Direct (Beam) shortwave irradiance as measured by an Eppley Laboratory, Inc. Model NIP (Normal Incidence Pyrheliometer) mounted in an automatic sun-following tracker. Annual NIP calibrations traceable to WRR. The Sun-Follower III tracker is not as reliable as the Sci-Tec tracker, because the tracker must be manually reset if it loses power. As of 10/1/2008, the NIP (unit 1) was moved to a Sci-Tec Tracker #2.
PSP Diffuse (Shadow Band) W/m2 10/25/1984 04/11/2003 18041F3 147.21 W/m2/mV
04/11/2003 08/28/2003 31395F3 120.52 W/m2/mV
08/28/2003 07/08/2004 18041F3 149.76 W/m2/mV
07/08/2004 06/02/2005 31395F3 121.80 W/m2/mV
06/02/2005 06/08/2006 18041F3 150.91 W/m2/mV
06/08/2006 06/28/2007 31395F3 122.60 W/m2/mV
06/28/2007 06/24/2008 18041F3 150.55 W/m2/mV
06/24/2008 07/22/2009 31395F3 123.73 W/m2/mV
07/22/2009 07/02/2010 31399F3 132.83 W/m2/mV
07/02/2010 05/26/2011 31395F3 123.64 W/m2/mV
05/26/2011 06/07/2012 31399F3 132.54 W/m2/mV
06/07/2012 06/20/2014 31395F3 123.17 W/m2/mV
06/20/2014 06/26/2017 31399F3 131.19 W/m2/mV
06/26/2017 07/27/2018 35246 (8-48) 121.65 W/m2/mV
[DQS]
[Maint]		 Diffuse (Sky) shortwave irradiance measured by a PSP mounted under a manually-adjusted shadow band. As of Aug. 24, 2001 the data is adjusted for the presence of the shadow band (a 10% to 18% increase is needed, depending on solar declination for the day of data). As of June 7, 2012, an effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the downwelling PIR) and Rnet = instruments effective net infrared response. As of June 13, 2012, the shadow band correction factor (SBCF) has been removed. As of January 2, 2015, effective net infrared correction was removed. As of March 11, 2015, SBCF was re-applied. As of June 26, 2017, the instrument was upgraded to an 8-48 and the Drummond offset (included in SBCF) was changed from 0.04 to 0.
PSP Global 40-South W/m2 07/15/1981 06/30/1983 17798F3 -
04/08/1985 07/31/2000 25766F3 104.70 W/m2/mV
11/01/2000 04/10/2003 20715F3 96.91 W/m2/mV
04/10/2003 08/28/2003 31398F3 122.74 W/m2/mV
08/28/2003 08/19/2004 20715F3 100.72 W/m2/mV
08/19/2004 07/07/2005 20068F3 105.36 W/m2/mV
07/07/2005 07/11/2006 31401F3 116.90 W/m2/mV
07/11/2006 06/12/2007 30560F3 116.03 W/m2/mV
06/12/2007 05/27/2008 31401F3 119.14 W/m2/mV
05/27/2008 07/23/2009 25819F3 118.21 W/m2/mV
07/23/2009 07/01/2010 30560F3 117.65 W/m2/mV
07/01/2010 06/09/2011 25819F3 117.50 W/m2/mV
06/09/2011 08/13/2012 30560F3 118.55 W/m2/mV
08/13/2012 12/16/2013 25819F3 117.06 W/m2/mV
12/16/2013 01/02/2015 30560F3 117.62 W/m2/mV
01/02/2015 04/09/2015 25819F3 117.49 W/m2/mV
[DQS]
[Maint]		 Total hemispheric solar irradiance on a south-facing surface tilted 40 degrees from horizontal. This is the solar resource for collectors with fixed-tilt,optimized for year-round performance.
PSP 2-Axis Global (Global Normal) W/m2 04/08/1985 07/31/2000 13674F3 103.52 W/m2/mV
PSP pyranometer mounted in automatic solar tracker. PSP is always normal to the sun (detector is perpendicular to direct irradiance).
PSP Global 1-Axis W/m2 04/08/1985 01/12/1999 - -
PSP Global 90-North W/m2 10/25/1984 - see database see database (click S/N)
[DQS]
[Maint]		 Total hemispheric solar irradiance on a north-facing surface tilted 90 degrees from horizontal, measured by a pyranometer, 8 feet above the ground. Note: In 2011, the SRRL building was expanded to the east, as a result the north facing sensors are now looking at the 11 foot tall building (the south east corner), which is 45 feet away.
PSP Global 90-East W/m2 10/25/1984 - see database see database (click S/N)
[DQS]
[Maint]		 Total hemispheric solar irradiance on a east-facing surface tilted 90 degrees from horizontal, measured by a pyranometer, 8 feet above the ground.
PSP Global 90-South W/m2 10/25/1984 - see database see database (click S/N)
[DQS]
[Maint]		 Total hemispheric solar irradiance on a south-facing surface tilted 90 degrees from horizontal, measured by a pyranometer, 8 feet above the ground.
PSP Global 90-West W/m2 10/25/1984 - see database see database (click S/N)
[DQS]
[Maint]		 Total hemispheric solar irradiance on a west-facing surface tilted 90 degrees from horizontal, measured by a pyranometer, 8 feet above the ground.
PSP Global 90-North (ground shielded) W/m2 10/25/1984 04/07/1985 17799F3 -
Total hemispheric solar irradiance on a north-facing surface tilted 90 degrees from horizontal, measured by a pyranometer, 9 feet above the ground. Instrument has a shield placed to prevent measuring radiation reflected from the ground.
PSP Global 90-North (ground reflected) W/m2 10/25/1984 04/07/1985 17800F3 -
Total hemispheric solar irradiance on a north-facing surface tilted 90 degrees from horizontal, measured by a pyranometer, 7 feet above the ground. Instrument has a shield placed so only radiation reflected up from the ground is measured.
PSP Global 90-South (ground shielded) W/m2 10/25/1984 04/07/1985 17798F3 -
Total hemispheric solar irradiance on a north-facing surface tilted 90 degrees from horizontal, measured by a pyranometer, 9 feet above the ground. Instrument has a shield placed to prevent measuring radiation reflected from the ground.
PSP Global 90-South (ground reflected) W/m2 10/25/1984 04/07/1985 17863F3 -
Total hemispheric solar irradiance on a north-facing surface tilted 90 degrees from horizontal, measured by a pyranometer, 7 feet above the ground. Instrument has a shield placed so only radiation reflected up from the ground is measured.
PSP Reflected (Upwelling) Shortwave W/m2 07/15/1981 04/10/2003 18035F3 124.27 W/m2/mV
04/10/2003 08/28/2003 31401F3 117.49 W/m2/mV
08/28/2003 09/02/2004 18035F3 125.64 W/m2/mV
09/02/2004 07/07/2005 20715F3 100.76 W/m2/mV
07/07/2005 06/07/2006 30560F3 114.87 W/m2/mV
06/07/2006 07/05/2007 20715F3 101.41 W/m2/mV
07/05/2007 05/27/2008 20068F3 107.09 W/m2/mV
05/27/2008 07/23/2009 20715F3 100.27 W/m2/mV
07/23/2009 07/01/2010 25823F3 107.31 W/m2/mV
07/01/2010 06/09/2011 20715F3 99.494 W/m2/mV
06/09/2011 08/13/2012 25823F3 106.62 W/m2/mV
08/13/2012 12/16/2013 20715F3 100.26 W/m2/mV
12/16/2013 01/02/2015 25823F3 106.31 W/m2/mV
01/02/2015 03/27/2015 20715F3 100.08 W/m2/mV
[DQS]
[Maint]		 Reflected hemispheric solar irradiance as measured by an inverted pyranometer, 2 meters above the ground. The surface ALBEDO is computed from the ratio: Reflected / Global Horizontal. The typical surface albedo for vegetation is 18% to 20% and greater than 80% for fresh snow cover. As of Aug 4, 2001 the Albedo is also calculated using the ventilated global PSP.
PSP Diffuse Tracking Disk W/m2 06/17/1987 03/13/1988 - -
PSP Global Horizontal RG780 Filter W/m2 03/14/1988 07/08/2004 25822F3 112.57 W/m2/mV
07/08/2004 06/02/2005 25820F3 116.22 W/m2/mV
06/02/2005 06/08/2006 25822F3 113.79 W/m2/mV
06/08/2006 06/28/2007 25820F3 116.75 W/m2/mV
06/28/2007 06/24/2008 25822F3 114.68 W/m2/mV
06/24/2008 07/22/2009 25820F3 116.31 W/m2/mV
07/22/2009 07/02/2010 25822F3 115.34 W/m2/mV
07/02/2010 05/26/2011 25820F3 116.33 W/m2/mV
05/26/2011 06/07/2012 25822F3 115.80 W/m2/mV
06/07/2012 06/20/2014 25820F3 116.06 W/m2/mV
06/20/2014 - 25822F3 see database (click S/N)
[DQS]
[Maint]		 RG780 implies the instrument has a Schott Glass filter with cut-on wavelength of 780 nm. A filter correction factor of 1.075 is applied to correct for the fact that the filter does not transmit 100% above 780nm, prior to 8/28/2014 a factor of 1.019 was used. The Ventilator was added on 11/01/2000. As of June 7, 2012, an effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the downwelling PIR) and Rnet = instruments effective net infrared response. As of July 3, 2014 at 15:00 MST the factory AC ventilator fan was replaced with a 12 VDC fan. As of January 2, 2015, ventilator and effective net infrared correction were removed. As of 6/16/2016 at 13:35 MST, the instrument is calibrated with the RG780 filter installed against the BMS "Reference RG780" = BMS "Reference Global" - MS7XX UV-Vis Spectral Sum, therefore filter correction is no longer required.
NIP Direct Normal RG780 Filter W/m2 03/14/1988 07/08/2004 17837E6 120.71 W/m2/mV
07/08/2004 06/02/2005 31355E6 116.63 W/m2/mV
06/02/2005 07/17/2006 17837E6 120.74 W/m2/mV
07/17/2006 06/28/2007 31355E6 116.45 W/m2/mV
06/28/2007 06/24/2008 17837E6 120.26 W/m2/mV
06/24/2008 07/22/2009 31355E6 116.10 W/m2/mV
07/22/2009 07/02/2010 17837E6 120.56 W/m2/mV
07/02/2010 05/26/2011 31355E6 118.50 W/m2/mV
05/26/2011 06/07/2012 17837E6 120.74 W/m2/mV
06/07/2012 06/20/2014 31355E6 119.0 W/m2/mV
06/20/2014 - 17837E6 see database (click S/N)
[DQS]
[Maint]		 RG780 implies the instrument has a Schott Glass filter with cut-on wavelength of 780 nm. A filter correction factor of 1.16 is applied to correct for the fact that the filter does not transmit 100% above 780nm, prior to 7/21/2015 a factor of 1.019 was used. As of 10/1/2016 at 0:00 MST, the instrument is calibrated with the RG780 filter installed against the BMS "Reference RG780" = BMS "Reference Direct" - DNI_MS7XX UV-Vis Spectral Sum, therefore filter correction is no longer required.
TUVR Global UV W/m2 03/14/1988 05/09/2002 18180 -
05/09/2002 01/27/2003 33444 -
01/27/2003 08/25/2004 18180 6.825 W/m2/mV
11/18/2004 - 33444 see database (click S/N)
[DQS]
[Maint]		 The TUVR was calibrated from 280 - 400 nm, prior to Aug. 19, 2001 it was calibrated from 280-385nm. The spectral response of this instrument is shown in this UVA/Total Plot.
TC-1 500nm Photometer T.W. Cannon V 03/14/1988 12/19/2023 0001 see database (click S/N)
[DQS]
[Maint]		 Photometer data from 11/01/2000 to 12/20/2005 was recorded in W/m2/nm. As of Aug 4, 2001, the Aerosol Optical Depth (AOD) is also calculated. The TWC AOD is not calculated using best practices and reported AOD should be considered "research". As of June 11, 2013, the 500nm AOD is available as a seperate AOD data set from the Prede POM-01.
CSL800-L Wind Speed m/s 03/14/1988 07/31/2000 - -
[DQS] Measured by a Climatronics 3-cup anemometer mounted 10 meters above ground level. After 03/09/1993, Peak Wind Speed was also recorded, which is the maximum 5-sec anemometer reading during the 1 (or 5) minute interval.
CSL800-L Wind Direction o from N 03/14/1988 07/31/2000 - -
[DQS] Measured by a Climatronics wind vane mounted 10 meters above ground level.
HMP-35C Dry Bulb Temperature and Relative Humidity (Roof) oC / % 03/14/1988 07/31/2000 - -
[DQS] Ambient air temperature measured with a Vaisala probe (also measures RH) mounted in a naturally aspirated radiation shield, 48 inches above the instrument deck level, located on the north instrument rail. The instrument deck is 10 feet above ground level. An asphalt parking area (25 ft x 40 ft) is north of the instrument deck.
PTA-427 Pressure mBar 03/14/1988 07/28/1999 - -
[DQS] The data are NOT adjusted to sea level conditions.
TUVR Direct UV W/m2 07/03/1990 12/31/2005 18115 7.495 W/m2/mV
06/01/2012 12/12/2013 - Calculated
12/13/2013 - 29238 see database (click S/N)
[DQS]
[Maint]		 The Direct TUVR was calibrated from 280 - 400 nm, prior to Aug. 19, 2001 it was calibrated from 280-385nm. The spectral response of this instrument is shown in this UVA/Total Plot.
? Dry Bulb Temperature (Tower) oC 03/09/1993 07/31/2000 - -
[DQS] Ambient air temperature measured with a PRT (platinum resistance thermometer) mounted in a forced/air radiation shield, 2 meters above the ground level, over natural vegetation.
NIP Direct Normal (unit 2) W/m2 01/13/1999 12/11/2014 25792E6 132.44 W/m2/mV
[DQS]
[Maint]		 Secondary NIP mounted on SciTec Tracker #1 (therefore more reliable than the primary NIP, which was mounted on SF3 tracker prior to 10/1/2008). From Aug 4, 2001 to Dec 20, 2005, Estimated 500nm Aerosol Optical Depth (AOD) and Broadband Turbidity is calculated using this instrument. As of June 11, 2013, the 500nm AOD is available as a seperate AOD data set from the Prede POM-01.
PSP Diffuse Shading Ball (Ventilated) W/m2 01/13/1999 07/08/2004 17878F3 138.62 W/m2/mV
07/08/2004 06/02/2005 17801F3 128.44 W/m2/mV
06/02/2005 06/08/2006 17878F3 138.84 W/m2/mV
06/08/2006 06/28/2007 17801F3 129.30 W/m2/mV
06/28/2007 06/24/2008 17878F3 139.38 W/m2/mV
06/24/2008 07/22/2009 17801F3 128.63 W/m2/mV
07/22/2009 07/02/2010 17878F3 140.38 W/m2/mV
07/02/2010 05/26/2011 17801F3 129.26 W/m2/mV
05/26/2011 06/07/2012 17878F3 141.96 W/m2/mV
06/07/2012 08/27/2013 17801F3 128.50 W/m2/mV
08/27/2013 06/20/2014 17878F3 139.22 W/m2/mV
06/20/2014 03/26/2015 17801F3 129.26 W/m2/mV
[DQS]
[Maint]		 Diffuse (Sky) shortwave irradiance measured by an Eppley Pyranometer mounted under the shading ball of a Sci-Tec tracker. As of Aug 4, 2001, a "thermal correction" is also applied, which is based on DW PIR, Net PIR, WS @ 22', and Deck Temp & RH. As of June 7, 2006, this "thermal correction" was replaced with the effective net infrared responsivity @ 45o applied to the corrected voltage (Vc). Where, Vc = V - Wnet * RSnet, where Wnet = effective net infrared (from the ventilated downwelling PIR) and RSnet = instruments effective net infrared response (derived from NREL black body system). As of June 1, 2012, irradiances without effective net infrared correction are no longer provided, instead, the raw mV signal is provided. As of June 24, 2014 at 17:00 MST the factory AC ventilator fan was replaced with a 12 VDC fan.
8-48 Diffuse Shading Ball (Ventilated) W/m2 01/13/1999 - see database see database (click S/N)
[DQS]
[Maint]		 Diffuse (Sky) shortwave irradiance measured by an Eppley Black & White Pyranometer mounted under the shading ball of a Sci-Tec tracker. As of June 24, 2014 at 17:00 MST the factory AC ventilator fan was replaced with a 12 VDC fan.
PIR Downwelling Infrared (Ventilated) W/m2 01/13/1999 - see database see database (click S/N)
[DQS]
[Maint]		 Infrared Irradiance is calculated using: I=K0+VK1+σK2Tr4+σK3(Td4-Tr4), where σ=5.6704x10-8 W/(m2K4) (Stephan-Boltzmann's Constant), V=PIR thermopile voltage in µV, and Tr=Tc+VKr. The DW IR is mounted horizontal in a ventilator and on Sci-Tec tracker such that the dome is always shaded. The Dome (Td) and Case Temperature (Tc) are also reported in degrees K. As of 2/19/1999 the Instrument Net Infrared is also reported which is equal to the Downwelling IR (µV Signal) times the calibration factor K1. As of June 24, 2014 at 17:00 MST the factory AC ventilator fan was replaced with a 12 VDC fan.
PIR Upwelling Infrared W/m2 01/13/1999 - see database see database (click S/N)
[DQS]
[Maint]		 Infrared Irradiance is calculated using: I=K0+VK1+σK2Tr4+σK3(Td4-Tr4), where Tr=Tc+VKr. The UW IR is an inverted PIR mounted 2 meters above ground on the radiometer tower. Starting on 11/01/2000, Dome (Td) and Case Temperature (Tc) are also reported in degrees K. As of 1/12/2006 the Instrument Net Infrared is also reported which is equal to the Upwelling IR (µV Signal) times the calibration factor K1.
LI-200 Global Licor (Secondary) W/m2 01/13/1999 12/21/2005 PY25070 73.897 W/m2/mV
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by a Licor silcon pyranometer with calibration factor traceable to the World Radiometric Reference (WRR).
CR10TCR CR23X Ref-Temp oC 01/13/1999 07/31/2000 343515 -
Thermocouple Reference Temperature at CR23X logger
Type T 8-48 Temp. oC 01/13/1999 01/15/2001 - -
Type T Thermocouple Temperature of Diffuse 8-48 case.
PTB101B Pressure mBar 07/28/1999 10/05/2011 T4730011 0.184 mBar/mV+600mBar
[DQS]
[Maint]		 The Vaisala Pressure Transmitter is mounted 2 meters above ground level near the 14 meter NRG TallTower. As of Aug 4, 2001 the estimated sea-level pressure is also calculated, where sea-level pressure = station_pressure + 201.275. On Sept 24, 2008 the pressure sensor was relocated to the radiometer tower.
278 Pressure mBar 10/05/2011 08/25/2014 3259571 0.2 mBar/mV+598.8mBar
08/25/2014 08/05/2016 3259547 0.2 mBar/mV+598.8mBar
08/05/2016 07/05/2018 3259571 0.2 mBar/mV+598.8mBar
07/05/2018 07/02/2020 3259547 0.2 mBar/mV+598.36mBar
07/02/2020 07/08/2022 3259571 0.2 mBar/mV+598.78mBar
07/08/2022 07/25/2024 3259547 0.2 mBar/mV+598.24mBar
07/25/2024 - 3259571 0.2 mBar/mV+598.78mBar
[DQS]
[Maint]		 The Setra Pressure Transmitter is mounted 2 meters above ground level on the radiometer tower. The estimated sea-level pressure is also calculated. On 1/29/2018 at 11:35 MST, the sea level pressure was updated to use the NOAA/NWS method, where sea-level pressure = station_pressure * ((288.0-0.0065*elevation)/288.0)^-5.2561 = station_pressure * 1.248. On 11-SEPT-2020, and RM Young Model 61002 Gill Pressure Port was installed at the end of the pressure inlet tube.
PSP Global Horizontal (Ventilated) W/m2 11/01/2000 - 28402F3 RS vs Z (2 degree)
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by an Eppley Laboratory, Inc. Model PSP (Precision Spectral Pyranometer) with calibration factor traceable to the World Radiometric Reference (WRR). As of Aug 4, 2001, a responsivity function (based on zenith angle) is also applied to this instrument. As of June 7, 2006, the responsivity function is using effective net infrared corrected coefficients applied to the corrected voltage (Vc). Where, Vc = V - Wnet * RSnet, where Wnet = effective net infrared (from the ventilated downwelling PIR) and RSnet = instruments effective net infrared response (derived from NREL black body system). The current coefficients for this function are available from AIM database server. As of June 1, 2012, irradiances without effective net infrared correction and/or non-zenith angle corrected are no longer provided, instead, the raw mV signal is provided. As of December 17, 2013 at 13:57 the responsivity function is replaced with a spline fit to AM/PM averaged 2-degree responsivity data (computed in the CR3000). As of July 3, 2014 at 15:00 MST the factory AC ventilator fan was replaced with a 12 VDC fan. As of December 19, 2023 at 13:15 MST, the ventilator was removed.
LI-200 Global Licor (Primary) W/m2 07/15/1981 06/30/1983 PY1366 -
11/01/2000 - PY28257 see database (click S/N)
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by a Licor silcon pyranometer with calibration factor traceable to the World Radiometric Reference (WRR).
501A UVBiometer Global UVB Solar Light W/m2
MED/hr
Index		 11/01/2000 - 1898 see database (click S/N)
[DQS]
[Maint]		 501A UVB wavelength = 280 - 315 nm in W/m2 and the Minimum Erythema Dose per Hour (MED/hr). As of Aug. 19, 2001, the UV-Index is also reported. Temperature is controlled at 25 oC. The spectral response of this instrument is shown in this UVB Plot. The MED/hr and Index is based on the CIE 1987 Erythema Action Spectrum as shown in this UVE Plot.
MS-210W Global UVB EKO W/m2 11/01/2000 - S92096.04 see database (click S/N)
[DQS]
[Maint]		 MS-210W UVB wavelength = 280 - 315 nm. The spectral response of this instrument is shown in this UVB Plot. As of 11/13/2017 at 15:39 MST, the native 1V output on the MS-210W control box is being used. Note: The MS-210W has been discontinued by the manufacture and replaced with the MS-212W.
CUVA1 Global UVA Kipp & Zonen W/m2 11/01/2000 10/17/2017 950006 see database (click S/N)
[DQS]
[Maint]		 The CUVA1 was calibrated from 315 - 400 nm, prior to Aug. 4, 2001 it was calibrated from 315 - 385 nm. Temperature is controlled at 40 oC. The spectral response of this instrument is shown in this UVA/Total Plot.
CUVB1 Global UVB Kipp & Zonen W/m2 11/01/2000 10/17/2017 952010 see database (click S/N)
[DQS]
[Maint]		 The CUVB1 was calibrated from 280 - 315 nm. Temperature is controlled at 40 oC. The spectral response of this instrument is shown in this UVB Plot.
UVB-1 Global UVB YES W/m2 11/01/2000 10/29/2003 921106 0.719 W/m2/V
10/29/2003 10/20/2008 930401 1.074 W/m2/V
10/20/2008 06/22/2017 921106 see database (click S/N)
06/22/2017 07/30/2018 930401 see database (click S/N)
07/30/2018 - 921106 see database (click S/N)
[DQS]
[Maint]		 UVB-1 UVB wavelength = 280 - 315 nm in W/m2. Prior to Aug. 19, 2001 the UV-Index was also reported. Temperature is controlled at 45 oC. The spectral response of this instrument is shown in this UVB Plot.
LI-200 Global 40-South Licor W/m2 07/15/1981 06/30/1983 PY1245 -
11/01/2000 10/10/2002 PY1726 75.02 W/m2/mV
10/10/2002 08/28/2003 PY1724 84.749 W/m2/mV
08/28/2003 08/19/2004 PY1726 81.631 W/m2/mV
08/19/2004 07/07/2005 PY28260 79.853 W/m2/mV
07/07/2005 07/11/2006 PY1732 77.026 W/m2/mV
07/11/2006 06/12/2007 PY28244 77.585 W/m2/mV
06/12/2007 05/27/2008 PY1732 76.376 W/m2/mV
05/27/2008 06/18/2009 PY1744 69.140 W/m2/mV
06/18/2009 09/08/2010 PY1750 74.535 W/m2/mV
09/08/2010 08/09/2011 PY28260 80.001 W/m2/mV
08/09/2011 08/13/2012 PY28248 82.853 W/m2/mV
08/13/2012 12/16/2013 PY28260 79.313 W/m2/mV
12/16/2013 01/02/2015 PY28248 82.557 W/m2/mV
01/02/2015 07/31/2015 PY28260 79.295 W/m2/mV
07/31/2015 07/29/2016 PY28248 81.103 W/m2/mV
07/29/2016 06/23/2017 PY28260 78.894 W/m2/mV
06/23/2017 07/27/2018 PY28248 80.941 W/m2/mV
07/27/2018 08/15/2018 PY28260 78.042 W/m2/mV
08/15/2018 10/03/2019 PY28247 77.405 W/m2/mV
10/03/2019 04/08/2020 PY28248 81.565 W/m2/mV
[DQS]
[Maint]		 Total hemispheric solar irradiance on a south-facing surface tilted 40 degrees from horizontal. This is the solar resource for collectors with fixed-tilt, optimized for year-round performance.
CM-21 2-Axis Global (Global Normal) Kipp & Zonen W/m2 11/01/2000 04/10/2003 920056 82.64 W/m2/mV
04/10/2003 08/28/2003 910002 61.412 W/m2/mV
08/28/2003 07/12/2004 920056 82.359 W/m2/mV
07/12/2004 06/01/2005 910002 61.645 W/m2/mV
06/01/2005 06/07/2006 920056 82.965 W/m2/mV
06/07/2006 06/28/2007 910002 61.344 W/m2/mV
06/28/2007 06/25/2008 920056 82.378 W/m2/mV
06/25/2008 07/23/2009 910002 61.532 W/m2/mV
07/23/2009 07/01/2010 920056 82.756 W/m2/mV
07/01/2010 06/09/2011 910002 61.177 W/m2/mV
06/09/2011 08/13/2012 920056 82.553 W/m2/mV
08/13/2012 12/16/2013 910002 61.127 W/m2/mV
12/16/2013 09/15/2014 920056 81.762 W/m2/mV
09/15/2014 06/20/2015 910002 61.184 W/m2/mV
[DQS]
[Maint]		 CM-21 pyranometer mounted in automatic Licor LI-2020 solar tracker, which is on top of the radiometer tower. The CM-21 is always normal to the sun (detector is perpendicular to direct irradiance).
CUVA2 Direct Normal UVA Kipp & Zonen W/m2 11/01/2000 - 961003 see database (click S/N)
[DQS]
[Maint]		 The CUVA2 was calibrated from 315 - 400 nm, prior to Aug. 4, 2001 it was calibrated from 315 - 385 nm. Temperature is controlled at 40 oC. The spectral response of this instrument is shown in this UVA/Total Plot.
CUVB2 Direct Normal UVB Kipp & Zonen W/m2 11/01/2000 - 953001 see database (click S/N)
[DQS]
[Maint]		 The CUVB2 was calibrated from 280 - 315 nm. Temperature is controlled at 40 oC. The spectral response of this instrument is shown in this UVB Plot.
CM-11 Diffuse Shading Disk Kipp & Zonen (Ventilated) W/m2 11/01/2000 08/03/2001 86325 191.17 W/m2/mV
Diffuse (Sky) shortwave irradiance measured by a Kipp & Zonen Pyranometer mounted under the shading ball of a Sci-Tec tracker.
MS-110 4-channel Photometer EKO mV 11/01/2000 06/16/2005 S94121.04 7.57 mV
8.77 mV
8.45 mV
8.51 mV
[DQS]
[Maint]		 4-channel photometer at 368, 500, 675, and 778 nm. As of Aug 4, 2001, the Aerosol Optical Depth (AOD), at each wavelength, is also calculated. Prior to Dec 21, 2005, the photometer outputs were recorded in W/m2/nm.
#40 Wind Speed NRG (Meteorolgical/PV Tower) m/s 11/01/2000 09/09/2008 - 0.022352 m/s/mV
[DQS]
[Maint]		 Measured by (3) 3-cup anemometers mounted 10, 22, and 42 feet above ground level on a 46 foot NRG TallTower. Peak Wind Speed was also recorded (for all three), which is the maximum 1-sec anemometer reading during the 1-minute interval. The frequency output of the #40 is converted a mV signal using an NRG #SI2100 Interface. As of Aug 4, 2001 the vertical wind shear is also calculated by taking the difference in speed of the sensors at 42 feet and 10 feet, then dividing by their distance (in meters).
#40C Wind Speed NRG (Meteorolgical/PV Tower) m/s 09/09/2008 05/08/2017 179500076953
179500078610		 0.760 m/s/Hz+0.34 m/s
0.758 m/s/Hz+0.38 m/s
11/16/2017 - 179500189695
179500189519		 0.768 m/s/Hz+0.38 m/s
0.772 m/s/Hz+0.38 m/s
[DQS]
[Maint]		 Measured by (2) 3-cup anemometers mounted 22 and 42 feet above ground level on a 46 foot NRG TallTower. Peak Wind Speed is also recorded (for both), which is the maximum 2-sec anemometer reading during the 1-minute interval. The vertical wind shear is also calculated by taking the difference in speed of the sensors at 42 feet and 22 feet, then dividing by their distance (in meters). From 12/6/2010 to 05/08/2017 the 22 foot sensor was replaced with a #40 (uncalibrated). On 11/16/2017 the 42 foot level was relocated to 33 feet (10 meters).
#200P Wind Direction NRG (Meteorolgical/PV Tower) o from N 11/01/2000 - - 0.144 o/mV+150o
[DQS]
[Maint]		 Measured by (2) wind vanes mounted 22 and 42 feet above ground level on a 46 foot NRG TallTower. On 11/16/2017 the 42 foot level was relocated to 33 feet (10 meters).
HMP Dry Bulb Temperature and Relative Humidity (Deck) oC
%		 11/01/2000 - see database see database (click S/N)
[DQS]
[Maint]		 Ambient air temperature measured with a Vaisala probe (also measures RH) mounted in a naturally aspirated radiation shield, 3 feet above the instrument deck level, located under a BORCAL table. The instrument deck is 15 feet above ground level. As of Sept. 24, 2008, the wind chill temperature is also calculated using National Weather Service method as described on the NOAA web site and the deck wind speed at 19' above ground level.
HMP Dry Bulb Temperature and Relative Humidity (Meteorolgical/SE-PV Tower) oC
%		 11/01/2000 - see database see database (click S/N)
[DQS]
[Maint]		 Ambient air temperature measured with a Vaisala probe (also measures RH) mounted in a naturally aspirated radiation shield, 2 meters above ground near the 14 meter NRG TallTower. As of Aug. 4, 2001 the tower wind chill temperature is also calculated using the wind speed at 42'. As of Dec. 13, 2002 the wind chill formula was updated to use the new National Weather Service method as described on the NOAA web site and the wind speed at 10'. As of Jan. 1, 2004 the tower dew point temperature is also calculated using both the temperature and RH. As of Aug. 1, 2004 the tower wet bulb temperature is also calculated using the dry bulb temperature, dew point, and station pressure. As of Sept 1, 2008, this sensor is renamed to "SE" (because the SunEdison PV field was installed arround it) and the new radiometer tower sensor is considered the "tower" temperature (tower wind chill, dew point, and wet bulb are now calculated using the radiometer tower sensor).
TE525 Precipitation Gauge (tipping bucket)
Campbell Scientific		 mm 11/01/2000 09/06/2017 14928 395 0.254 mm/count
TB4 09/08/2017 - 14-630 0.254 mm/count
[DQS]
[Maint]		 The precipitation gauge is mounted 4 feet above ground level near the 46 foot NRG TallTower. As of Aug. 4, 2001, the accumulated daily precipitation is also recorded. The rain gauge was relocated near the radiometer tower on 9/12/2008.
CR10TCR J-Box Ref-Temp (thermistor) oC 11/01/2000 01/15/2001 343515 -
Thermocouple Reference Temperature mounted inside J-Box that is used for connecting 8-48 Thermocouple to datalogger.
(CR23X-T) CR23X Panel Temperature oC 11/01/2000 11/09/2012 - -
CR23X internal temperature sensor is located under wiring panel.
(CR3000-T) CR3000 Panel Temperature oC 11/09/2012 - - -
CR3000 internal temperature sensor is located under wiring panel.
(CR10X-T) CR10X Circuit Board Temperature (Met-Tower) oC 11/01/2000 - - -
CR10X internal temperature sensor is mounted on datalogger circuit board. Logger was upgraded to a CR800 on 7/1/2015.
(CR23X-B) CR23X Battery Voltage V 11/01/2000 11/09/2012 - -
CR23X internal battery voltage, charged by AC power.
(CR3000-B) CR3000 Battery Voltage V 11/09/2012 - - -
CR3000 internal battery voltage, charged by AC power.
(CR10X-B) CR10X Battery Voltage (Met-Tower) V 11/01/2000 - - -
CR10X external battery voltage, charged by AC power. As of Sept 25, 2008, battery was replaced with a CSI BP24 (24Ahr) and is charged by a CSI SP20 20-Watt Solar Panel with CH100 charger/regulator. Battery now provides power for both the CR10X and Freewave wireless transmitter. Logger was upgraded to a CR800 on 7/1/2015.
LI-1800 Global 40-South Spectral Data W/m2/nm 01/24/2001 06/13/2006 PRS 456 see database
07/10/2008 02/15/2012 PRS 456 see database
[DQS]
[Maint]		 LICOR LI-1800 Spectroradiometer with traceability to NIST Standard of Spectral Irradiance Lamp Standards. The instrument has 6nm spectral bandwidth and the detector is not temperature controlled. The usable spectral range of the instrument is 300 to 1000nm. Measurements are made using the standard cosine receptor with instrument on a 40 south facing tilt. Data is taken at 2nm intervals every 5 minutes. Instrument data type value (field column 1) is 1.
LI-1800 Global Horizontal Spectral Data W/m2/nm 06/13/2006 07/10/2008 PRS 456 see database
02/15/2012 05/08/2015 PRS 456 see database
[DQS]
[Maint]		 LICOR LI-1800 Spectroradiometer with traceability to NIST Standard of Spectral Irradiance Lamp Standards. The instrument has 6nm spectral bandwidth and the detector is not temperature controlled. The usable spectral range of the instrument is 300 to 1000nm. Measurements are made using the standard cosine receptor. Data is taken at 2nm intervals every 5 minutes. Instrument data type value (field column 1) is 4.
LI-1800 Direct Normal Spectral Data W/m2/nm 04/30/2001 08/03/2003 PRS 158 see database
[DQS]
[Maint]		 LICOR LI-1800 Spectroradiometer with traceability to NIST Standard of Spectral Irradiance Lamp Standards. The instrument has 4nm spectral bandwidth and the detector is maintained at 40oC +/- 1oC (Note: On hot summer days, the detector probably overheated up to 8oC). The usable spectral range of the instrument is 350 to 1100nm. Measurements are made using the 1800-10 Quartz Fiber Optic Probe (w/o remote cosine receptor) and the fiber end is inserted into a 5o view limiting tube (with window), which is mounted on a Sci-Tec tracker. Data is taken at 2nm intervals every 5 minutes. Instrument data type value (field column 1) is 2.
(LI2020-B) LI-2020 Battery Voltage V 05/23/2001 - - 0.01 V/mV
The battery voltage for the LI-2020 tracker, which is used for the Global Normal CM-21. The battery is charged by a PV panel. The setup instructions for the LI-2020 are available online.
CG4 Downwelling Infrared (Ventilated)
Kipp & Zonen		 W/m2 08/04/2001 - see database see database (click S/N)
[DQS]
[Maint]		 Infrared Irradiance is calculated using: I=K0+VK1+σK2Tr4+σK3(Td4-Tr4), where σ=5.6704x10-8 W/(m2K4) (Stephan-Boltzmann's Constant), V=PIR thermopile voltage in µV, and Tr=Tc+VKr. The DW CG4 is mounted horizontal in a ventilator and on Sci-Tec tracker such that the dome is always shaded. The Case Temperature (Tc) is also reported in degrees K. The Instrument Net Infrared is also reported, which is equal to the Downwelling IR (µV Signal) times the calibration factor K1.
CNR1 Net Radiometer (Downwelling CM3)
Kipp & Zonen		 W/m2 08/04/2001 - 010284-DW-CM3 107.75 W/m2/mV
[DQS]
[Maint]		 The CRN1 has (4) instruments: Downwelling CM3 (shortwave global), Upwelling CM3 (shortwave), Downwelling CG3 (Infrared), and Upwelling CG3 (Infrared). The CNR1 mounted is mounted on the radiometer tower. The PT-100 Case Temperature (Tc) is also reported in degrees K. The Albedo and Net Radiation are also calculated for this instrument. As of June 1, 2012, the Global CM22 is used for calculating the Albedo and Net Radiation.
CNR1 Net Radiometer (Upwelling CM3)
Kipp & Zonen		 W/m2 08/04/2001 - 010284-UW-CM3 108.45 W/m2/mV
[DQS]
[Maint]		 The CRN1 has (4) instruments: Downwelling CM3 (shortwave global), Upwelling CM3 (shortwave), Downwelling CG3 (Infrared), and Upwelling CG3 (Infrared). The CNR1 mounted is mounted on the radiometer tower. The PT-100 Case Temperature (Tc) is also reported in degrees K. The Albedo and Net Radiation are also calculated using this instrument. As of June 1, 2012, the Global CM22 is used for calculating the Albedo and Net Radiation.
CNR1 Net Radiometer (Downwelling CG3)
Kipp & Zonen		 W/m2 08/04/2001 01/01/2015 010284-DW-CG3 K0=0.0 W/m2
K1=0.1010 W/m2/µV
K2=1.0080
K3=0.0
Kr=7.044e-4 K/µV
[DQS]
[Maint]		 The CRN1 has (4) instruments: Downwelling CM3 (shortwave global), Upwelling CM3 (shortwave), Downwelling CG3 (Infrared), and Upwelling CG3 (Infrared). Infrared Irradiance is calculated using: I=K0+VK1+σK2Tr4+σK3(Td4-Tr4), where σ=5.6704x10-8 W/(m2K4) (Stephan-Boltzmann's Constant), V=PIR thermopile voltage in µV, and Tr=Tc+VKr. The CNR1 mounted is mounted on the radiometer tower. The PT-100 Case Temperature (Tc) is also reported in degrees K. The Atmos. Net Infrared and Net Radiation are also calculated using this instrument. As of 1/1/2006 the Instrument Net Infrared is also reported which is equal to the Downwelling IR (µV Signal) times the calibration factor K1. As of June 1, 2012, the Downwelling CG4 is used for calculating the Atmos. Net Infrared and Net Radiation. The CG3 is a flat dome instrument, therefore it is easily contaminated by snow, rain, and moisture, which causes very large errors in downwelling infrared measurements. Data from the DW CG3 should be used with extreme caution.
CNR1 Net Radiometer (Upwelling CG3)
Kipp & Zonen		 W/m2 08/04/2001 - 010284-UW-CG3 K0=0.0 W/m2
K1=0.093 W/m2/µV
K2=1.0095
K3=0.0
Kr=7.044e-4 K/µV
[DQS]
[Maint]		 The CRN1 has (4) instruments: Downwelling CM3 (shortwave global), Upwelling CM3 (shortwave), Downwelling CG3 (Infrared), and Upwelling CG3 (Infrared). Infrared Irradiance is calculated using: I=K0+VK1+σK2Tr4+σK3(Td4-Tr4), where σ=5.6704x10-8 W/(m2K4) (Stephan-Boltzmann's Constant), V=PIR thermopile voltage in µV, and Tr=Tc+VKr. The CNR1 mounted is mounted on the radiometer tower. The PT-100 Case Temperature (Tc) is also reported in degrees K. The Atmos. Net Infrared and Net Radiation are also calculated using this instrument. As of 1/1/2006 the Instrument Net Infrared is also reported which is equal to the Upwelling IR (µV Signal) times the calibration factor K1. As of June 1, 2012, the Downwelling CG4 is used for calculating the Atmos. Net Infrared and Net Radiation.
CH1 Direct Normal Kipp & Zonen W/m2 08/04/2001 05/27/2010 010256 91.797 W/m2/mV
05/27/2010 08/02/2010 080033 111.82 W/m2/mV
08/02/2010 05/23/2013 010256 92.241 W/m2/mV
05/23/2013 07/29/2013 31137E6 118.39 W/m2/mV
07/29/2013 - 010256 92.546 W/m2/mV
[DQS]
[Maint]		 Direct (Beam) shortwave irradiance as measured by a Kipp & Zonen pyrheliometer mounted on a Sci-Tec tracker. The CH1 has a 5 degree field of view. As of Dec 21, 2005, the Estimated 500nm Aerosol Optical Depth (AOD) and Broadband Turbidity is calculated using this instrument. As of December 1, 2017, Estimated 500nm Aerosol Optical Depth (AOD) is no longer reported. As of June 11, 2013, the 500nm AOD is available as a seperate AOD data set from the Prede POM-01.
CM22 Diffuse Shading Disk Kipp & Zonen (Ventilated) W/m2 08/04/2001 - see database see database
[DQS]
[Maint]		 Diffuse (Sky) shortwave irradiance measured by a Kipp & Zonen Pyranometer mounted under the shading ball of a Sci-Tec tracker. As of June 7, 2012, an effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the downwelling CG4) and Rnet = instruments effective net infrared response.
CM6b Global Horizontal Kipp & Zonen W/m2 08/04/2001 - 015189 see database (click S/N)
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by a Kipp & Zonen pyranometer with calibration factor traceable to the World Radiometric Reference (WRR). As of June 7, 2012, an effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the downwelling CG4) and Rnet = instruments effective net infrared response.
SP-Lite Global Horizontal Kipp & Zonen Silicon W/m2 08/04/2001 01/08/2015 970003 12.052 W/m2/mV
SP-Lite2 01/08/2015 08/26/2015 140311 14.980 W/m2/mV
08/26/2015 - 151027 see database (click S/N)
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by a Kipp & Zonen silicon pyranometer with calibration factor traceable to the World Radiometric Reference (WRR).
UV-S-A-T Global UVA Kipp & Zonen W/m2 08/04/2001 - 010536 see database (click S/N)
[DQS]
[Maint]		 The UV-S-A-T was calibrated from 315 - 400 nm. Temperature is controlled at 25 oC. The spectral response of this instrument is shown in this UVA/Total Plot.
UV-S-B-T Global UVB Kipp & Zonen W/m2 08/04/2001 - 010538 see database (click S/N)
[DQS]
[Maint]		 The UV-S-B-T was calibrated from 280 - 315 nm. Temperature is controlled at 25 oC. The spectral response of this instrument is shown in this UVB Plot.
UVB-1 Diffuse UVB YES W/m2 08/04/2001 10/29/2003 930401 0.754 W/m2/V
02/10/2004 08/06/2008 921106 1.065 W/m2/V
[DQS]
[Maint]		 UVB-1 UVB wavelength = 280 - 315 nm in W/m2. Temperature is controlled at 45 oC. Instrument is mounted on Sci-Tec Tracker under shading disk. The spectral response of this instrument is shown in this UVB Plot.
TSP-1 Global Horizontal YES W/m2 08/04/2001 08/28/2014 940703 0.49551 W/m2/mV
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by a Yankee Environmental Systems (YES) pyranometer with calibration factor traceable to the World Radiometric Reference (WRR).
LI-201 Direct Normal LI-Cor W/m2 08/04/2001 08/02/2016 PYHR100 see database (click S/N)
08/02/2016 - PYHR101 see database (click S/N)
[DQS]
[Maint]		 Direct (Beam) shortwave irradiance as measured by a Licor silcon pyrheliometer mounted on the Sun-Follower III Tracker.
LI-190 Global Quantum LI-Cor µmol/s/m2 08/04/2001 04/23/2008 Q8435 -260.0 µmol/s/m2/mV
04/23/2008 07/06/2018 Q8432 see database (click S/N)
07/06/2018 05/13/2024 Q8785 see database (click S/N)
05/13/2024 - Q8709 see database (click S/N)
[DQS]
[Maint]		 The LI-COR quantum sensor measures photosynthetically active radiation (PAR) in the 400 to 700 nm waveband. The spectral response of this instrument is shown in this plot.
(FW-B) Met-Tower Transmitter Battery Voltage V 08/04/2001 08/31/2008 - 0.01 V/mV
The battery voltage used for the FreeWave wireless transmitter at the meteorological tower. The battery is charged by AC power.
(CR10X-T) CR10X Circuit Board Temperature (Rad-Tower) oC 08/04/2001 11/18/2014 - -
CR10X internal temperature sensor is mounted on datalogger circuit board. Logger was upgraded to CR3000 on 11/18/2014.
(CR10X-B) CR10X Battery Voltage (Rad-Tower) V 08/04/2001 11/18/2014 - -
CR10X external battery voltage, charged by AC power. Battery provides power for both CR10X and CSI NL100 Network Link. Logger (and NL100) were upgraded to CR3000 on 11/18/2014.
(calc) Net Radiation and Net Infrared (atmos.) W/m2 08/04/2001 - - -
Calculated after data collection (outside the datalogger) and added to the datastream. Net Radiation = Net Solar + Net IR (atmos.), where Net Solar = Downwelling Shortwave - Upwelling Shortwave and Net IR (atmos.) = Downwelling Infrared - Upwelling Infrared. As of 1/2/2015, only one Net Radiation is reported, calculated using Atmos Net IR (PIRs), Global CM22 (vent), and Upwelling PSP. As of 3/27/2015 the Upwelling PSP was replaced with a CM21.
(calc) Zenith Angle o 08/04/2001 - - -
Solar zenith angle (refracted). Calculated after data collection (outside the datalogger) using the Solar Position Algorithm (SPA) and added to the datastream. Prior to June 21, 2004, SOLPOS was used.
(calc) Azimuth Angle o 08/04/2001 - - -
Solar azimuth angle. Calculated after data collection (outside the datalogger) using the Solar Position Algorithm (SPA) and added to the datastream. Prior to June 21, 2004, SOLPOS was used.
(calc) Airmass - 08/04/2001 - - -
Relative optical airmass (not pressure corrected). Calculated after data collection (outside the datalogger) using the Solar Position Algorithm (SPA) and added to the datastream. Prior to June 21, 2004, SOLPOS was used.
AOCS Direct Normal Spectral Data (calculated) W/m2/nm 10/19/2001 09/30/2008 1 -
[DQS]
[Maint]		 The AOCS calculates spectral data from 300 to 4000nm (variable interval), every 60 seconds when the AOCS parameter is less than 0.15. See the AOCS page for more information. Instrument data type value (field column 1) is 3.
TSP-700 Global Horizontal YES W/m2 01/01/2004 - 0212-2 see database (click S/N)
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by a Yankee Environmental Systems (YES) pyranometer.
LI-200 Upwelling Shortwave LI-Cor W/m2 01/07/2004 - see database see database (click S/N)
[DQS]
[Maint]		 Reflected hemispheric solar irradiance as measured by an inverted silicon pyranometer, 2 meters above the ground. The surface ALBEDO is computed from the ratio: Reflected LI-200 / Global Horizontal LI-200. The typical surface albedo for vegetation is 18% to 20% and greater than 80% for fresh snow cover.
LI-190 Upwelling Quantum LI-Cor µmol/s/m2 01/07/2004 03/24/2006 Q20558 338.3 µmol/s/m2/mV
03/28/2006 - Q20555 see database (click S/N)
[DQS]
[Maint]		 Reflected hemispheric solar irradiance as measured by an inverted quantum pyranometer, 2 meters above the ground. The LI-COR quantum sensor measures photosynthetically active radiation (PAR) in the 400 to 700 nm waveband. The spectral response of this instrument is shown in this plot. The surface ALBEDO is computed from the ratio: Reflected LI-190 / Global Horizontal LI-190. As of 1/1/2024, ALBEDO = Reflected LI-190 / Global Horizontal PQS1.
(varies) Research Channels (varies) 02/13/2004 - - -
[DQS]
[Maint]		 Research channels used for testing various instruments at different times. Output could be a voltage or engineering units. Channel is usually shorted (output at zero) when not in use. Further information is available on the Research Channel History page.
LI-200 Global 90-North LI-Cor W/m2 06/14/2004 - see database see database (click S/N)
[DQS]
[Maint]		 Total hemispheric solar irradiance on a north-facing surface tilted 90 degrees from horizontal, measured by a silicon pyranometer, 8 feet above the ground. Note: In 2011, the SRRL building was expanded to the east, as a result the north facing sensors are now looking at the 11 foot tall building (the south east corner), which is 45 feet away.
LI-200 Global 90-East LI-Cor W/m2 06/14/2004 - see database see database (click S/N)
[DQS]
[Maint]		 Total hemispheric solar irradiance on a east-facing surface tilted 90 degrees from horizontal, measured by a silicon pyranometer, 8 feet above the ground.
LI-200 Global 90-South LI-Cor W/m2 06/14/2004 - see database see database (click S/N)
[DQS]
[Maint]		 Total hemispheric solar irradiance on a south-facing surface tilted 90 degrees from horizontal, measured by a silicon pyranometer, 8 feet above the ground.
(observe) ΔT and ΔUT1 seconds 06/18/2004 - - -
ΔT is the difference between the earth rotation time and the terrestrial time. ΔT is derived from observation only and is reported in the IERS Bulletin-A, where ΔT = 32.184 + (TAI-UTC) - ΔUT1. As of 1-APR-2013, ΔUT1 is also available, which is the fractional second difference between UTC and UT which is used to adjust UTC for earth's irregular rotation rate and is derived from observation only and is reported in the IERS Bulletin-A. Historical ΔT data is also available from IERS.
TSI-880 Total & Opaque Cloud Cover percent 08/01/2004 - 119 -
[DQS]
[Maint]		 Calculated by a Yankee Total Sky Imager Model 880. This instrument captures all sky images, analyzes them, and computes the percentage of cloud cover. Historical raw and processed images are available in the SRRL TSI-880 Sky Imager Gallery. Note: The instrument only analyzes clouds between zenith angles of 0 to 80o (clouds on the very low horizon are ignored) and cloud cover is calculated every 1 minute. Historical images are only retained every 10 minutes.
LI-200 Global 90-West LI-Cor W/m2 08/19/2004 - see database see database (click S/N)
[DQS]
[Maint]		 Total hemispheric solar irradiance on a west-facing surface tilted 90 degrees from horizontal, measured by a silicon pyranometer, 8 feet above the ground.
CM22 Global Horizontal Kipp & Zonen (Ventilated) W/m2 06/01/2005 05/31/2006 010046 107.69 W/m2/mV
05/31/2006 06/13/2007 010034 91.776 W/m2/mV
06/13/2007 05/23/2008 010046 107.52 W/m2/mV
05/23/2008 07/06/2009 010034 91.660 W/m2/mV
07/06/2009 06/30/2010 010046 107.19 W/m2/mV
06/30/2010 - 010034 91.936 W/m2/mV
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by a Kipp & Zonen pyranometer with calibration factor traceable to the World Radiometric Reference (WRR). As of June 7, 2012, an effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the downwelling CG4) and Rnet = instruments effective net infrared response.
PYR-P Global Horizontal Apogee W/m2 12/2/2005 10/20/2008 2703 5.3808 W/m2/mV
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by a Apogee silicon pyranometer with calibration factor traceable to the World Radiometric Reference (WRR). Note: Apogee has renamed this instrument model to SP-110.
SP-110 Global Horizontal Apogee W/m2 10/20/2008 12/06/2010 7272 5.8157 W/m2/mV
12/06/2010 12/11/2014 17197 5.3763 W/m2/mV
03/13/2015 - 40337 see database (click S/N)
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by a Apogee silicon pyranometer with calibration factor traceable to the World Radiometric Reference (WRR).
LI-210 Global Photometric LI-Cor klux 12/21/2005 - PH7994 see database (click S/N)
[DQS]
[Maint]		 The LI-COR photometric sensor measures the visible radiation with a sensor having a spectral responsivity curve similar to the human eye. The sensor uses a filtered silicon photodiode to provide a spectral response that matches the CIE curve to within ± 5%. The spectral response of this sensor is shown in this plot.
ULTRA-S Snow Depth Senix cm 12/21/2005 09/06/2007 00103742 -0.089544 cm/mV+231.227 cm
[DQS]
[Maint]		 The Senix ultra-sonic distance sensor is mounted 156.1 cm above the ground. The snow depth is equal to 156.1 minus the distance measured by the sensor. The sensor determines the distance by bouncing an ultra sonic pulse off the ground (or snow) and based on the time for the pulse return back to the sensor it calculates a distance (the sensor is temperature compensated). When the instrument is unable to determine the distance due to uneven obstructions, obsorbing materials, etc, the instrument will output a 6999 value.
SR50A Snow Depth CSI cm 09/06/2007 - 1263 N/A
[DQS]
[Maint]		 The Campbell Scientific Inc. ultra-sonic distance sensor is mounted approx. 143 cm above the ground. The snow depth is equal to sensor height above ground minus the distance measured by the sensor. The sensor determines the distance by bouncing an ultra sonic pulse off the ground (or snow) and based on the time for the pulse return back to the sensor it calculates a distance (the sensor is temperature compensated). The sensor also reports a quality indicator as follows:
0Not able to read distance
162-210Good measurement quality numbers
210-300Reduced echo signal strength
300-600High measurement uncertainty
As of 12/13/2007, the datalogger will automatically filter snow depth values, based on quality indicators above. When the quality is outside the "valid" range of 160-250, the previous valid snow depth will be output for up to ~30 minutes, if the quality is still invalid, then the snow depth will become a missing value (-6999). Note: In 2011, the SRRL building was expanded to the east, for some reason this expansion included adding new dirt to the area south of the building expansion, as a result this dirt creates snow drifting in the vicinity of the snow depth sensor. On 1/17/2018, the sensor was relocated to a new stand 30 feet west of the radiometer in an effort to find a location that will produce more accurate readings.
(calc) Direct Extraterrestrial (ETRN) W/m2 01/01/2006 - - -
Extraterrestrial (top-of-atmosphere) direct normal solar irradiance (ETRN). Calculated after data collection (outside the datalogger) and added to the datastream. ETRN = SOLCON / R2, where SOLCON = the Solar Constant = 1367 W/m2 and R = Earth radius vector, which is calculated using the Solar Position Algorithm (SPA). Note: As of 26-JAN-2023 @ 15:12 MST, a value of 1361.1 W/m2 is used for the solar constant.
(calc) Global Extraterrestrial (ETR) W/m2 01/01/2006 - - -
Extraterrestrial (top-of-atmosphere) global horizontal solar irradiance (ETR). Calculated after data collection (outside the datalogger) and added to the datastream. ETR = ETRN * cos(Z), where ETRN = Direct Extraterrestrial and Z = Zenith Angle.
(CR23X-P) CR23X Program Exec. Time (Maximum) s 01/01/2006 11/09/2012 - -
The maximum time it took for the CR23X to execute its program during the 1-minute interval. The program is currently scheduled to run every 3.0 seconds (20 times during the minute). Program execution will take the longest on the last scan of the minute, due to 1-minute average computations and outputs.
(CR3000-P) CR3000 Program Exec. Time (Maximum) s 11/09/2012 - - -
The maximum time it took for the CR3000 to execute its program during the 1-minute interval. The program is currently scheduled to run every 3.0 seconds (20 times during the minute). Program execution will take the longest on the last scan of the minute, due to 1-minute average computations and outputs.
PSP Zebra (Global or Diffuse) W/m2 05/25/2007 07/28/2008 29668F3 121.30 W/m2/mV
07/28/2008 07/22/2009 25818F3 115.25 W/m2/mV
07/22/2009 07/02/2010 25765F3 116.68 W/m2/mV
07/02/2010 05/26/2011 25818F3 115.26 W/m2/mV
05/26/2011 06/07/2012 25765F3 117.20 W/m2/mV
06/07/2012 06/20/2014 25818F3 115.05 W/m2/mV
06/20/2014 12/11/2014 25765F3 116.59 W/m2/mV
[DQS]
[Maint]		 Total Hemispheric shortwave or Diffuse (Sky) shortwave irradiance measured by a PSP mounted under a manually-adjusted shadow band with evenly spaced square holes (Zebra shadow band). As of June 7, 2012, an effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the downwelling PIR) and Rnet = instruments effective net infrared response. As of January 2, 2015, effective net infrared correction was removed.
(CR10X-O) CR10X Table Overuns (Meteorolgical and Radiometer Towers) counts 09/06/2007 07/01/2015 - -
The number of times the CR10X program execution exceeded the execution interval defined for the table. Under normal operation this value should be always be zero, the counter must be reset manually. The meteorolgical tower program is currently scheduled to run every 1.0 seconds. As of Sept 1, 2008, this output was also added to the radiometer tower program which is scheduled to run every 3.0 seconds. On 7/1/2015 this was replaced with program execution time (because logger was upgraded to CR800).
SPN1 Global Horizontal and Diffuse W/m2 01/01/2008 08/02/2010 A168 1.0162 W/m2/mV
08/02/2010 - A360 see database (click S/N)
[DQS]
[Maint]		 Total Hemispheric shortwave and Diffuse (Sky) shortwave irradiance as measured by a ΔT Model SPN1 Sunshine Pyranometer. An internal heater keeps the dome clear of dew, ice and snow down to -20oC (in still air conditions). Instrument is not calibrated according to best practices and measured data should be considered "research".
PGS-100 Direct Normal Spectral Data W/m2/nm 08/06/2008 01/21/2010 S08029 see database
01/29/2010 04/22/2010 S09032 see database
04/22/2010 05/06/2010 S08029 see database
05/06/2010 - S09032 see database
[DQS]
[Maint]		 Prede PGS-100 Direct Normal Spectroradiometer with traceability to NIST Standard of Spectral Irradiance Lamp Standards (through a LICOR LI-1800 spectroradiometer). The instrument has 3.6nm spectral bandwidth and the detector is maintained at 35oC +/- 2oC. The usable spectral range of the instrument is 350 to 1050nm, however when the detector is not at 35 oC there will be high uncertainty above 950nm resulting in errors up to 10%. Measurements are made by a Si-CCD with a 1o degree field of view, which is mounted on a Prede ASTX-1 tracker. Data is taken at approx 0.7nm intervals (slightly variable, differs for each serial number) every 5 minutes. Instrument data type value (field column 1) is 6. The specified operating range of the PGS-100 is -10 oC to +45 oC (without wind chill), near or outside that range will result in the detector going beyond the +/- 2oC temperature controller specifications.
CUV4 Global Total UV W/m2 08/08/2008 08/10/2018 080019 see database (click S/N)
08/10/2018 - 080018 see database (click S/N)
[DQS]
[Maint]		 Global Total Ultra-Violet radiation measured by a Kipp & Zonen CUV4. The spectral response of this instrument is shown in this plot.
CUV4 Diffuse Total UV W/m2 08/12/2008 08/28/2014 080018 see database (click S/N)
[DQS]
[Maint]		 Diffuse Total Ultra-Violet radiation measured by a Kipp & Zonen CUV4. Instrument is mounted on Sci-Tec Traker under shading ball. The spectral response of this instrument is shown in this plot.
(calc) Direct Normal Total UV (calculated) W/m2 08/15/2008 12/12/2013 - -
[DQS]
[Maint]		 Direct (Beam) total ultraviolet radiation is calculated using the formula: Global = Direct * Cosine(Zenith) + Diffuse, where Diffuse and Global are measured by a shaded and un-shaded CUV4. Note: Direct is set to zero when the Zenith >= 88.5.
MS-700 Global 40-South Spectral Data (OTF) W/m2/nm 08/20/2008 01/27/2023 S07125.02 see database
[DQS]
[Maint]		 EKO MS-700 Spectroradiometer with traceability to NIST Standard of Spectral Irradiance Lamp Standards. The instrument has 10nm spectral bandwidth and the detector is maintained at 25oC +/- 5oC. The usable spectral range of the instrument is 350 to 1050nm. Measurements will be made at a 40 degree south tilt on the roof of the NREL Outdoor Test Facility (OTF), which is a building just "below" SRRL. Data is taken at approx 3.3nm intervals (slightly variable) every 60 seconds. Instrument data type value (field column 1) is 5.
HMP Dry Bulb Temperature and Relative Humidity (Radiometer Tower) oC
%		 09/01/2008 - see database see database (click S/N)
[DQS]
[Maint]		 Ambient air temperature measured with a Vaisala probe (also measures RH) mounted in a naturally aspirated radiation shield, 2 meters above ground near the radiometer tower. The wind chill temperature is also calculated using National Weather Service method as described on the NOAA web site and the wind speed at 6'. The dew point temperature is also calculated using both the temperature and RH. The wet bulb temperature is also calculated using the dry bulb temperature, dew point, and station pressure.
03001 Wind Speed & Direction R.M. Young (Radiometer Tower) m/s
o from N		 09/08/2008 05/12/2017 2008 06 0.75 m/s/Hz+0.2 m/s
0.142 o/mV+180o
05/12/2017 - 2017 06 0.75 m/s/Hz+0.2 m/s
0.142 o/mV+180o
[DQS]
[Maint]		 Measured by a 3-cup anemometer and wind vane mounted 6 feet above ground level attached to the radiometer tower. Peak Wind Speed was also recorded, which is the maximum 3-sec anemometer reading during the 1-minute interval.
03001 Wind Speed & Direction R.M. Young (Instrument Deck) m/s
o from N		 09/24/2008 05/12/2017 2008 19 0.75 m/s/Hz+0.2 m/s
0.142 o/mV+0o
05/12/2017 - 2017 19 0.75 m/s/Hz+0.2 m/s
0.142 o/mV+0o
[DQS]
[Maint]		 Measured by a 3-cup anemometer and wind vane mounted 19 feet above ground level attached to the west side of the instrument deck. Peak Wind Speed was also recorded, which is the maximum 3-sec anemometer reading during the 1-minute interval.
POM-01 7-channel Photometer Prede nA
µA		 10/16/2008 11/08/2011 PS1825402 15.95 nA
141.4 µA
324.5 µA
356.7 µA
248.2 µA
171.4 µA
189.2 µA
03/01/2012 - PS2206006 95.95 nA
99.24 µA
283.0 µA
335.7 µA
234.4 µA
190.4 µA
182.2 µA
[DQS]
[Maint]		 7-channel photometer at 315, 400, 500, 675, 870, 940, 1020 nm. As of Dec 19, 2008, the Aerosol Optical Depth (AOD), at each wavelength, is also calculated as well as the precipitable water vapor (cm), these calculated values are under revision and SHOULD NOT BE USED. Data is acquired using the manufacture provided software and then merged with the BMS data stream. Each wavelength is sampled once during the 1-minute interval, total time to scan all wavelengths is approx 10 seconds. The instrument includes a moisture sensor, that will cause the data collection to stop and the tracker to return to the home position (sensor facing the ground) when rain or snow is detected. The instrument will not acquire data when the zenith angle is greater than 84.5, the sun intensity is below a certain threshold, or if the sensor detects moisture; during those times a value of -6999 will be reported. Instrument PS2206006 has a factory upgrade for improved 315nm measurement performance. As of June 11, 2013, the new ESR method of AOD calculation is available as a seperate AOD data stream.
HMP Dry Bulb Temperature and Relative Humidity (Data Lab) oC
%		 08/13/2009 - see database see database (click S/N)
[DQS]
[Maint]		 Ambient air temperature measured with a Vaisala probe (also measures RH), 7 feet above the floor inside the SRRL Data Lab.
EFM-100 Atmospheric Electric Field kV/m 09/27/2010 - 01A0267 0.01 kV/m/mV
[DQS]
[Maint]		 Measured by a Boltek EFM-100 Atmospheric Electric Field Monitor (EFM) mounted on the top of the radiometer tower at a height of approximately 13 feet above ground. A value greater than +/- 0.5 kV/m is "warning level" and a value greather than +/- 2 kV/m is high potential for lighting. EFM is measured by data logger using analog output from sensor and a 10:1 voltage divider. A custom sensitivity plug of 2.6 kOhms is installed on the EFM. The data logger samples the EFM every 3-seconds and reports the 1-minute average; as of 2-JAN-2024 the minimum and maximum is also reported.
LI-200 Global Sun Edison (SE) Plane of Array (POA) W/m2 11/15/2011 06/20/2012 PY66489 109.34 W/m2/mV
06/20/2012 06/26/2014 PY66482 130.96 W/m2/mV
06/26/2014 08/03/2015 PY66489 109.70 W/m2/mV
08/03/2015 10/28/2016 PY66482 130.77 W/m2/mV
10/28/2016 11/16/2017 PY66489 108.25 W/m2/mV
11/16/2017 01/09/2019 PY66482 131.48 W/m2/mV
01/09/2019 11/19/2019 PY66489 107.06 W/m2/mV
11/19/2019 06/23/2022 PY66482 131.02 W/m2/mV
[DQS]
[Maint]		 Total hemispheric solar irradiance in the plane of array of Sun Edison PV string. The Sun Edison PV farm consists of 1-Axis solar trackers. The angle of the tracker is also available and is measured by the inclinometer below.
SCA121T-D03 Sun Edison (SE) Plane of Array (POA) Tracker Angle degrees 11/15/2011 07/01/2015 VTI w/2:1 VDIV arcsin(0.001*mV-1.25)
07/01/2015 06/23/2022 VTI arcsin(0.0005*mV-1.25)
[DQS]
[Maint]		 Measured using the y-axis output of a VTI Technologies dual axis inclinometer (a 2:1 voltage divider was required). A positive angle indicates the Sun Edision 1-Axis tracker is facing west, zero is horizontal, and negative facing east. The 2:1 voltage divider was removed when the logger was upgraded from a CR10X to CR800 on 1-JULY-2015.
(flag) Horizontal TP Thermal Correction - 06/07/2012 - - -
Flag to indicate when effective net infrared thermal correction has been applied to a horizontal (non-black and white) thermopile pyranometer. A value of one indicates that correction was applied to all samples during the one-minute average, a value of zero indicates that no correction was applied to any readings during the minute, and a fractional value represents the fraction of readings during the minute that had the correction applied to it. Correction is suspended if the difference in downwelling infrared irradiance from the Eppley and Kipp & Zonen pyrgeometers exceed 40 W/m2; correction is then resumed when the difference drops below 30 W/m2. Note: Due to calibration logistic issues, the CM3 (mounted on the CNR1) never has correction applied.
LI-190 Direct Quantum LI-Cor µmol/s/m2 08/27/2012 - Q8434 see database (click S/N)
[DQS]
[Maint]		 The LI-COR quantum sensor measures photosynthetically active radiation (PAR) in the 400 to 700 nm waveband. The spectral response of this instrument is shown in this plot. The LI-190 sensor is installed in a NREL-custom direct normal limiting tube that was constructed as part of the AOCS.
(CR3000-CF) CR3000 CF Change Count counts 05/17/2013 - - -
A counter that indicates the number of calibration factors (CF) that were changed during a day (value is reset to zero at midnight). Calibration factors for instruments collected by CR3000 data logger are stored in a text file in memory, the logger will read the file on request (by chaning a flag in memory) and also at midnight, the number of values that change are indicated by the counter.
(CR3000-ZA) CR3000 Zenith Angle degrees 07/30/2013 - - -
Solar zenith angle (refracted) as calculated by the CR3000 using the Campbell SolarPosition function (SOLPOS-based).
MS-56 Direct Normal EKO W/m2 01/06/2014 04/29/2019 P12022 see database (click S/N)
04/29/2019 - S18015.22 see database (click S/N)
[DQS]
[Maint]		 Direct (Beam) shortwave irradiance as measured by an EKO Model MS-56 Pyrheliometer mounted on Sci-Tec Tracker #1 with calibration factor traceable to the World Radiometric Reference (WRR). The MS-56 was upgraded to an MS-57 on 29-April-2019.
WISER Global or Direct Spectral Data (WISER) W/m2/nm 03/13/2014 - see below see below
[DQS]
[Maint]		 EKO WISER Spectroradiometer System with traceability to NIST Standard of Spectral Irradiance Lamps. Over time the WISER system consists of any of these combinations: MS-710 and MS-712; MS-701, MS-710, and MS-712; or MS-711 and MS-712 spectroradiometers. Further details regarding the individual spectoradiometers can be found below. Data is switch from the MS-710/711 to MS-712 at 900nm. As of 15:15 MST on 26-MAR-2015, the MS-701 data is merged with the WISER, data is switched from the MS-701 to MS-710 at 395nm. As of 17:25 MST on 8-SEP-2017, the MS-701 and MS-710 were replaced with an MS-711. The instruments can be mounted for either global horizontal or direct normal measurements on a solar tracker. For direct normal measurements, the instruments are outfitted with a 5 degree FOV limiting tube. Datacollection and processing is performed by a Campbell CR6 or CR1000X (prior to MS-711 upgrade a Campbell CR1000 or CR3000 data logger was used). As of 12-Nov-2019, a Campbell CR1000 is used. Scan rate is typically every 5 minutes, but may occasionally be every 1 minute. Scan rate was permenently changed to 1 minute on 6-AUG-2019. Instrument is typically mounted in global horizontal orientation, but instrument is switched to a solar tracking orientation at these occasional times:
  • Direct Normal: 19-SEP-2014 @ 11:15 through 17-MAR-2015
  • Direct Normal: 16-SEP-2016 to 3-NOV-2016
  • Direct Normal: 15-SEP-2017 @ 10:15 to 18-SEP-2017 @ 09:41
  • Global Normal: 18-SEP-2017 @ 09:49 to 20-SEP-2017 @ 12:11
  • Global Normal: 25-SEP-2017 @ 13:00 to 26-SEP-2017 @ 07:11
  • Direct Normal: 26-SEP-2017 @ 07:20 to 12-OCT-2017 @ 07:30
  • Global Normal: 12-OCT-2017 @ 07:40 to 19-OCT-2017 @ 14:00
MS-710 Global or Direct Spectral Data (MS-710) W/m2/nm 03/13/2014 09/08/2017 S13098.13 see database
[DQS]
[Maint]		 EKO MS-710 Spectroradiometer with traceability to NIST Standard of Spectral Irradiance Lamps. The MS-710 instrument has 4nm spectral bandwidth and the detector is maintained at 25oC +/- 3oC. The instruments raw data output interval is 0.73nm however data is interpolated to 1nm. Instrument was replaced with the MS-711 on 8-SEP-2017.
MS-711 Global or Direct Spectral Data (MS-711) W/m2/nm 09/08/2017 - S17024.07 see database
[DQS]
[Maint]		 EKO MS-711 Spectroradiometer with traceability to NIST Standard of Spectral Irradiance Lamps. The MS-711 instrument has 6.5nm spectral bandwidth and the detector is maintained at 25oC +/- 1oC. The instruments raw data output interval is 0.41nm however data is interpolated to 1nm.
MS-712 Global or Direct Spectral Data (MS-712) W/m2/nm 03/13/2014 07/14/2021 S13099.11 see database
07/14/2021 09/03/2021 S18070.01 see database
09/03/2021 09/02/2022 S16059.01 see database
09/02/2022 11/21/2022 S13099.11 see database
11/21/2022 08/11/2023 S18070.01 see database
08/11/2023 - S16059.01 see database
[DQS]
[Maint]		 EKO MS-712 Spectroradiometer with traceability to NIST Standard of Spectral Irradiance Lamps. The MS-712 instrument has 5nm spectral bandwidth and the detector is maintained at -5oC +/- 1oC. The instruments raw data output interval is 1.6nm, however data is interpolated to 1nm.
MS-701 Global or Direct Spectral Data (MS-701) W/m2/nm 05/15/2014 09/08/2017 S12065.02 see database
[DQS]
[Maint]		 EKO MS-701 Spectroradiometer System with traceability to NIST Standard of Spectral Irradiance Lamps. The MS-701 instrument has 3nm spectral bandwidth and the detector is maintained at 25oC +/- 5oC. The instrument raw data output interval is 0.8nm, however data is interpolated to 1nm. Datacollection and processing is performed by the EKO factory software. As of 26-MAR-2015 instrument data is no longer a seperate data stream (collected by EKO factory software) and is merged with the WISER data. Instrument was replaced with the MS-711 on 8-SEP-2017. Note: On 12-MAY-2021 the MS701 data stream was used for other research purposes and should be ingored by the user.
CHP1 Direct Normal Kipp & Zonen W/m2 01/01/2015 06/23/2015 010256-CH1 92.546 W/m2/mV
06/23/2015 - 080009 see database (click S/N)
[DQS]
[Maint]		 Direct (Beam) shortwave irradiance as measured by a Kipp & Zonen pyrheliometer mounted on a Sci-Tec tracker. The instrument has a 5 degree field of view. The Estimated 500nm Aerosol Optical Depth (AOD) and Broadband Turbidity is calculated using this instrument.
CMP22 Global Horizontal Kipp & Zonen (Ventilated) W/m2 01/01/2015 06/22/2015 010034-CM22 91.936 W/m2/mV
06/22/2015 04/23/2024 080017 see database (click S/N)
04/23/2024 - 140043 see database (click S/N)
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by a Kipp & Zonen pyranometer with calibration factor traceable to the World Radiometric Reference (WRR). An effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the downwelling CG4) and Rnet = instruments effective net infrared response.
CMP11 2-Axis Global (Global Normal) Kipp & Zonen W/m2 01/01/2015 06/20/2015 910002-CM21 61.184 W/m2/mV
06/20/2015 07/29/2016 140840 142.72 W/m2/mV
07/29/2016 06/23/2017 114747 109.68 W/m2/mV
06/23/2017 12/01/2017 140840 141.88 W/m2/mV
[DQS]
[Maint]		 Kipp & Zonen pyranometer mounted in automatic Licor LI-2020 solar tracker, which is on top of the radiometer tower. The pyranometer is always normal to the sun (detector is perpendicular to direct irradiance).
CMP11 Global 40-South Kipp & Zonen W/m2 01/01/2015 01/02/2015 30560F3 117.62 W/m2/mV
01/02/2015 04/09/2015 25819F3 117.49 W/m2/mV
04/09/2015 06/25/2015 140911 114.16 W/m2/mV
06/25/2015 07/29/2016 091084 119.18 W/m2/mV
07/29/2016 06/23/2017 140911 116.33 W/m2/mV
06/23/2017 07/27/2018 091084 118.52 W/m2/mV
07/27/2018 10/03/2019 140911 115.58 W/m2/mV
10/03/2019 03/30/2020 091084 116.93 W/m2/mV
[DQS]
[Maint]		 Total hemispheric solar irradiance on a south-facing surface tilted 40 degrees from horizontal. This is the solar resource for collectors with fixed-tilt, optimized for year-round performance.
CM21 Reflected (Upwelling) Shortwave W/m2 01/01/2015 01/02/2015 25823F3 106.31 W/m2/mV
01/02/2015 03/27/2015 20715F3 100.08 W/m2/mV
03/27/2015 07/17/2015 920056 81.762 W/m2/mV
07/17/2015 07/29/2016 910002 61.327 W/m2/mV
07/29/2016 06/23/2017 920056 81.255 W/m2/mV
06/23/2017 11/27/2017 910002 61.262 W/m2/mV
11/27/2017 12/01/2017 140910-CMP11 109.62 W/m2/mV
[DQS]
[Maint]		 Reflected hemispheric solar irradiance as measured by an inverted pyranometer, 2 meters above the ground. The surface ALBEDO is computed from the ratio: Reflected / Global Horizontal CM22. The typical surface albedo for vegetation is 18% to 20% and greater than 80% for fresh snow cover.
CM3 Global Horizontal Kipp & Zonen W/m2 01/01/2015 03/11/2015 010284-DW-CM3 107.75 W/m2/mV
03/11/2015 - 014261 see database (click S/N)
[DQS]
[Maint]		 Global Horizontal shortwave irradiance measured by a Kipp & Zonen Pyranometer with calibration factor traceable to the World Radiometric Reference (WRR). An effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the ventilated downwelling CG4 and unventilated CMP22 case temperature) and Rnet = instruments effective net infrared response = 0.40 µV/W/m2. Note: Prior to 11-March-2015, the data was provided from a CM3 part of a CNR1 Net Radiometer and no effective net infrared correction was applied.
CM3 Upwelling Shortwave Kipp & Zonen W/m2 01/01/2015 - see database see database (click S/N)
[DQS]
[Maint]		 Upwelling shortwave irradiance measured by a Kipp & Zonen thermopile sensor. Albedo is also calculated using this instrument.
CG3 Upwelling Infrared Kipp & Zonen W/m2 01/01/2015 - see database see database (click S/N)
[DQS]
[Maint]		 Infrared Irradiance is calculated using: I=K0+VK1+σK2Tr4+σK3(Td4-Tr4), where σ=5.6704x10-8 W/(m2K4) (Stephan-Boltzmann's Constant), V=PIR thermopile voltage in µV, and Tr=Tc+VKr. The thermistor case temperature (Tc) is also reported in degrees K and Instrument Net Infrared is also reported which is equal to the Upwelling IR (µV Signal) times the calibration factor K1. The Atmos. Net Infrared is also calculated using this instrument.
(calc) Effective Net Infrared (Wnet) W/m2 01/02/2015 - - -
Effective Net Infrared (Wnet) is typically used when correcting thermal offets in horizontal non-black and white pyranometers. Wnet = Win - Wout, where Win = incoming (downwelling) infrared and Wout = σ * Tc4, where Tc = case temperature of the pyranometer being corrected, if not available a similiar instrument with the same (or similar) body type and ventilation can be used (such as a pyrgeometer of the same make and ventilation).
SPP Global Horizontal (Ventilated) W/m2 02/24/2015 07/24/2020 37839F3 see database (click S/N)
07/24/2020 08/12/2020 38860F3 138.12 W/m2/mV
08/12/2020 - 37839F3 see database (click S/N)
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by an Eppley Laboratory, Inc. Model SPP (Standard Precision Pyranometer) with calibration factor traceable to the World Radiometric Reference (WRR). An effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the ventilated downwelling PIR) and Rnet = instruments effective net infrared response = 0.30 µV/W/m2. Note: The factory AC ventilator fan has been retrofitted with a 12 VDC fan. As of December 19, 2023 at 13:15 MST, the ventilator was removed.
GPP Global Horizontal W/m2 02/25/2015 - 37831F3 see database (click S/N)
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by an Eppley Laboratory, Inc. Model GPP (Global Precision Pyranometer) with calibration factor traceable to the World Radiometric Reference (WRR). An effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the ventilated downwelling CG4 and unventilated CMP22 case temperature) and Rnet = instruments effective net infrared response = 0.15 µV/W/m2.
sNIP Direct Normal W/m2 02/25/2015 - 37882E6 see database (click S/N)
[DQS]
[Maint]		 Direct (Beam) shortwave irradiance as measured by an Eppley Laboratory, Inc. Model sNIP (Normal Incidence Pyrheliometer) mounted in an automatic sun-following tracker (SciTec Tracker #1) with calibration factor traceable to the World Radiometric Reference (WRR).
CMP11 Diffuse Shading Disk Kipp & Zonen W/m2 02/25/2015 06/22/2015 140713 114.94 W/m2/mV
06/22/2015 06/10/2016 140910 109.67 W/m2/mV
06/10/2016 06/14/2017 140713 116.39 W/m2/mV
06/14/2017 11/27/2017 140910 109.62 W/m2/mV
[DQS]
[Maint]		 Diffuse (Sky) shortwave irradiance measured by a Kipp & Zonen Pyranometer mounted under the shading ball of a Sci-Tec tracker with calibration factor traceable to the World Radiometric Reference (WRR). An effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the ventilated downwelling CG4 and unventilated CMP22 case temperature) and Rnet = instruments effective net infrared response = 0.205 µV/W/m2.
CMP11 Global Horizontal Kipp & Zonen W/m2 03/10/2015 - 140712 see database (click S/N)
[DQS]
[Maint]		 Global Horizontal shortwave irradiance measured by a Kipp & Zonen Pyranometer with calibration factor traceable to the World Radiometric Reference (WRR). An effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the ventilated downwelling CG4 and unventilated CMP22 case temperature) and Rnet = instruments effective net infrared response = 0.205 µV/W/m2.
PQS1 Global Quantum Kipp & Zonen µmol/s/m2 03/10/2015 - 131225 see database (click S/N)
[DQS]
[Maint]		 The Kipp & Zonen quantum sensor measures photosynthetically active radiation (PAR) in the 400 to 700 nm waveband. The spectral response of this instrument is shown in this plot.
MS-802 Global Horizontal EKO MS-802 W/m2 03/10/2015 - F14077R see database (click S/N)
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by a EKO thermopile pyranometer with calibration factor traceable to the World Radiometric Reference (WRR). As of 6/22/2015, An effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the ventilated downwelling CG4 and unventilated CMP22 case temperature) and Rnet = instruments effective net infrared response = 0.18 µV/W/m2.
MS-410 Global Horizontal EKO MS-410 W/m2 03/10/2015 04/22/2015 N/A (#94) 98.62 W/m2/mV
04/22/2015 - S13144.085R see database (click S/N)
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by a EKO thermopile pyranometer with calibration factor traceable to the World Radiometric Reference (WRR). As of 6/22/2015, An effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the ventilated downwelling CG4 and unventilated CMP22 case temperature) and Rnet = instruments effective net infrared response = 0.20 µV/W/m2.
MS-602 Global Horizontal EKO MS-602 W/m2 03/10/2015 - S13071483 see database (click S/N)
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by a EKO thermopile pyranometer with calibration factor traceable to the World Radiometric Reference (WRR). As of 6/22/2015, An effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the ventilated downwelling CG4 and unventilated CMP22 case temperature) and Rnet = instruments effective net infrared response = 0.30 µV/W/m2.
ML-01 Global Horizontal EKO Silicon W/m2 03/13/2015 03/23/2015 S13135062 23.095 W/m2/mV
03/23/2015 - S13135063 see database (click S/N)
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by a EKO silicon pyranometer with calibration factor traceable to the World Radiometric Reference (WRR).
LI-200R Global Horizontal LI-COR Silicon W/m2 04/10/2015 - PY100360 see database (click S/N)
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by a LI-COR silicon pyranometer with calibration factor traceable to the World Radiometric Reference (WRR).
DR02 Direct Normal Hukseflux W/m2 05/22/2015 - 9206 CF=see database (click S/N)
a=-0.0000094995
b=0.00044574
c=0.9949
[DQS]
[Maint]		 Direct (Beam) shortwave irradiance as measured by an Hukseflux Model DR02 Fast Response Pyrheliometer mounted on Sci-Tec Tracker #2 with calibration factor traceable to the World Radiometric Reference (WRR). Irradiance data is temperature corrected based on the formula: Irradiance = V * CF / (a*T2 + b*T +c), where V = thermopile signal in mV, CF is the calibration factor reported above, T is the ambient deck temperature in degrees C, and the temperature coefficients (a, b, and c) are reported above. The raw thermopile mV signal is also reported. As of 27-NOV-2017, the Global SR25 case temperature is used for the correction instead of air temperature. As of 05:34 MST on 4-JAN-2024, the Direct DR20 case temperature is used instead of Global SR25 case.
CMP22 Global Horizontal Kipp & Zonen (Primary) W/m2 06/22/2015 04/23/2024 140043 see database (click S/N)
04/23/2024 - 210757 see database (click S/N)
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by a Kipp & Zonen pyranometer with calibration factor traceable to the World Radiometric Reference (WRR). An effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the ventilated downwelling CG4 and unventilated primary CMP22 case temperature) and Rnet = instruments effective net infrared response.
CMP22 Global Horizontal Kipp & Zonen (Secondary) W/m2 06/22/2015 - 100174 see database (click S/N)
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by a Kipp & Zonen pyranometer with calibration factor traceable to the World Radiometric Reference (WRR). An effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the ventilated downwelling CG4 and unventilated primary CMP22 case temperature) and Rnet = instruments effective net infrared response.
CM22 Diffuse Shading Disk Kipp & Zonen (Secondary, Ventilated) W/m2 06/22/2015 - see database see database
[DQS]
[Maint]		 Diffuse (Sky) shortwave irradiance measured by a Kipp & Zonen Pyranometer with calibration factor traceable to the World Radiometric Reference (WRR) mounted under the shading ball of a Sci-Tec tracker. An effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the ventilated downwelling CG4) and Rnet = instruments effective net infrared response.
CHP1 Direct Normal Kipp & Zonen (Secondary) W/m2 06/23/2015 - 140108 see database (click S/N)
[DQS]
[Maint]		 Direct (Beam) shortwave irradiance as measured by a Kipp & Zonen pyrheliometer with calibration factor traceable to the World Radiometric Reference (WRR) mounted on a Sci-Tec tracker. The instrument has a 5 degree field of view.
LI-1800 Global 1-Axis Spectral Data W/m2/nm 12/01/2015 09/14/2017 PRS 102 see database
[DQS]
[Maint]		 LICOR LI-1800 Spectroradiometer with traceability to NIST Standard of Spectral Irradiance Lamp Standards. The instrument has 4nm spectral bandwidth and the detector is maintained at 40oC +/- 0.25oC. The usable spectral range of the instrument is 350 to 1100nm. Measurements are made using on a 1-Axis Global tracking system. Data is taken at 2nm intervals every 5 minutes. Instrument data type value (field column 1) is 8.
MS-710 Global 1-Axis Spectral Data (WISER) W/m2/nm 10/03/2017 04/28/2022 S13098.13 see database
[DQS]
[Maint]		 EKO MS-710 Spectroradiometer with traceability to NIST Standard of Spectral Irradiance Lamps. The MS-710 instrument has 4nm spectral bandwidth and the detector is maintained at 25oC +/- 3oC. Data scan rate is 5 minutes and instrument raw data output interval is 0.73nm, however data is interpolated to 1nm. Data above 900nm is discarded in favor of the MS-712 below. As of 6-AUG-2019, scan rate was changed to 1 minute.
MS-712 Global 1-Axis Spectral Data (WISER) W/m2/nm 10/03/2017 09/03/2021 S16059.01 see database
09/03/2021 04/28/2022 S18070.01 see database
[DQS]
[Maint]		 EKO MS-712 Spectroradiometer with traceability to NIST Standard of Spectral Irradiance Lamps. The MS-712 instrument has 5nm spectral bandwidth and the detector is maintained at -5oC +/- 1oC. Data scan rate is 5 minutes and instrument raw data output interval is 1.6nm, however data is interpolated to 1nm.
SR25 Global Horizontal Hukseflux W/m2 08/01/2016 11/27/2017 2516 see database (click S/N)
11/27/2017 - 2543 see database (click S/N)
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by a Hukseflux sapphire pyranometer with calibration factor traceable to the World Radiometric Reference (WRR). As of 27-NOV-2017, Irradiance data is temperature corrected based on the formula: Irradiance = V * CF / (a*T2 + b*T +c), where V = thermopile signal in mV, CF is the calibration factor reported above, T is the SR25 case temperature in degrees C, and the temperature coefficients (a, b, and c) are reported above (in database link). As of December 19, 2023 at 14:00 MST, the SR25 was installed in an retrofited Eppley Ventilator with 12 VDC Fan.
SolarSIM-D2+ Direct Normal SolarSIM-D2+ W/m2/nm 09/01/2016 - 107 see database
[DQS]
[Maint]		 Spectrafy SolarSIM-D2+ spectral modeling device with traceability to NIST Standard of Spectral Irradiance Lamp Standards (through a spectroradiometer). The instrument has 6 narrow band wavelength channels then uses a model to generate spectral data from 280 to 4000nm. Raw data is collected every 20 seconds by a CR800 data logger and the MIDC web site uses the model to generate spectral data on-the-fly. See the SolarSIM-D2+ page for more information and details on how to download large volumes of spectral data.
LI-200R 2-Axis Global (Global Normal) LI-COR Silicon W/m2 12/01/2016 - see database see database (click S/N)
[DQS]
[Maint]		 LI-COR Silicon pyranometer mounted in automatic Licor LI-2020 solar tracker, which is on top of the radiometer tower. The pyranometer is always normal to the sun (detector is perpendicular to direct irradiance). On 3/27/2020, the pyranometer was moved to a new EKO STR-32G tracker on the south patio.
8-48 Diffuse (Shadow Band) W/m2 06/26/2017 - see database see database (click S/N)
[DQS]
[Maint]		 Diffuse (Sky) shortwave irradiance measured by a 8-48 mounted under a manually-adjusted shadow band. The data is adjusted for the presence of the shadow band (a 10% to 18% increase is needed, depending on solar declination for the day of data). The Drummond offset (included in SBCF) is set to 0 (instead of 0.04 which is typically used when a PSP is mounted under the shadowband).
MS-71X Research Spectral Data (MS-710, MS-711, or MS-712) W/m2/nm 07/24/2017 - - -
[DQS]
[Maint]		 EKO MS-71X Series Spectroradiometer(s) with traceability to NIST Standard of Spectral Irradiance Lamps. The instruments raw data output interval is interpolated to 1nm. This instrument is for research purposes and can be any orientation (global horizontal, global tilt, global tracking, direct tracking, or diffuse horizontal) and may not be operational at all times. Further information is available on the Research Channel History page.
(calc) Solar Eclipse Shading % 8/16/2017 - - -
The percentage area of the sun being shaded by a solar eclipse (100% = total eclipse). Calculated after data collection (outside the datalogger) using the Solar and Moon Position Algorithm (SAMPA) and added to the datastream. This value is equal to 100 - a_sul_pct, where a_sul_pct is the percent area of sun's unshaded lune reported by SAMPA.
(calc) SAMPA/Bird Irradiance (Global, Direct, Diffuse) W/m2 8/16/2017 - - -
The estimated global horizontal, direct normal, and diffuse horizontal irradiance from sun's unshaded lune. Calculated after data collection (outside the datalogger) using the Solar and Moon Position Algorithm (SAMPA) and Bird Clear Sky Model and added to the datastream. Note: As of 2-FEB-2024 @ 11:25 MST, a value of 1361.1 W/m2 is used for the solar constant for Bird Model (instead of 1367).
ASI-16 All Sky Imager and Cloud Cover percent 09/26/2017 - 16031 -
[DQS]
[Maint]		 EKO/CMS-Schreder All Sky Imager Model ASI-16: this instrument captures all sky images, analyzes them, and computes the percentage of cloud cover. Note: The instrument only analyzes clouds between zenith angles of 0 to 80o (clouds on the very low horizon are ignored) and cloud cover is calculated every 10 minutes. The FindClouds PC-Based post processing software uses two algorithms to produce cloud cover percentage. The BRBG is an evaluation using the blue/red and blue/green ratio of the image and the CDOC is an evaluation using the cloud detection and opacity classification algorithm. Before evaluating the image for clouds the software first maps the image into a projection which corrects for distortions created by the use of a fish eye lens. To help with cloud detection the camera takes a normally exposed and an under exposed image at each time stamp. In addition the software reports a sun flag, which is defined as follows:
  • 0 = Sun not visible
  • 1 = Sun on clear sky
  • 3 = Parts of sun cloud covered
  • 5 = Sun behind clouds, but a bright dot is visible
  • 8 = Sun outside view, either because of zenith angle, or sun is hidden by horizon
  • 9 = No Sun flag evaluation was made
CMP11 Reflected (Upwelling) Shortwave W/m2 11/27/2017 - see database see database (click S/N)
[DQS]
[Maint]		 Reflected hemispheric solar irradiance as measured by an inverted pyranometer, 2 meters above the ground. The surface ALBEDO is computed from the ratio: Reflected / Global Horizontal CMP22 (Vent). The typical surface albedo for vegetation is 18% to 20% and greater than 80% for fresh snow cover.
CMP22 2-Axis Global (Global Normal) Kipp & Zonen W/m2 12/01/2017 - see database see database (click S/N)
[DQS]
[Maint]		 Kipp & Zonen pyranometer mounted in automatic Licor LI-2020 solar tracker, which is on top of the radiometer tower. The pyranometer is always normal to the sun (detector is perpendicular to direct irradiance). On 3/27/2020, the pyranometer was moved to a new EKO STR-32G tracker on the south patio.
SR25 Diffuse Shading Disk Hukseflux W/m2 12/01/2017 - see database see database (click S/N)
[DQS]
[Maint]		 Diffuse (Sky) shortwave irradiance measured by a Hukseflux Pyranometer mounted under the shading ball of a Sci-Tec tracker with calibration factor traceable to the World Radiometric Reference (WRR). Irradiance data is temperature corrected based on the formula: Irradiance = V * CF / (a*T2 + b*T +c), where V = thermopile signal in mV, CF is the calibration factor reported above, T is the Global SR25 case temperature in degrees C, and the temperature coefficients (a, b, and c) are reported above (in database link). As of December 21, 2023 at 14:40 MST, the SR25 was installed in an retrofited Eppley Ventilator with 12 VDC Fan.
(flag) Hukseflux TP Temperature Correction - 12/01/2017 - - -
Flag to indicate when Hukseflux Thermopile temperature correction has been applied to hukseflux radiometers. A value of one indicates that correction was applied to all samples during the one-minute average, a value of zero indicates that no correction was applied to any readings during the minute, and a fractional value represents the fraction of readings during the minute that had the correction applied to it. Correction is automatically suspended when the temperature used for correction is detected as invalid. As of 05:34 MST on 4-JAN-2024, variable has been redefined as follows:
  • 0 = No temp correction applied to any Hukseflux radiometers
  • 1 = Temp correction only applied to direct Hukseflux pyrheliometers
  • 2 = Temp correction only applied to global and diffuse Hukseflux pyranometers
  • 3 = Temp correction applied to all Hukseflux radiometers (direct, global, and diffuse).
501A UVA Global UVA Solar Light W/m2 12/01/2017 - 23157 see database (click S/N)
[DQS]
[Maint]		 501A UVA wavelength = 315 - 400 nm in W/m2. Temperature is controlled at 25 oC. The spectral response of this instrument is shown in this UVA Plot.
MS-80 Global Horizontal EKO W/m2 12/01/2017 - S17096005 see database (click S/N)
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by a EKO pyranometer with calibration factor traceable to the World Radiometric Reference (WRR).
260-2590 Moisture Detector NovaLynx Flag 12/01/2017 - 130121 -
[DQS]
[Maint]		 The NovaLynx precipitation (moisture) detector is mounted 19 feet above ground level near the north east corner of the SRRL Instrument Deck. A value of one indicates that moisture was detected during the entire one minute interval, a value of zero indicates that no moisture was dectected during the entire one minute interval, and a fractional value represents the fraction of readings during the minute that moisture was detected. Note: BMS is using the Normally Closed Relay contact, so if there is loss of power or malfuction, the data will report a value of one.
SL-510 Downwelling Infrared Apogee W/m2 12/01/2017 03/29/2023 see database see database (click S/N)
[DQS]
[Maint]		 Infrared Irradiance is calculated using: I=K0+VK1+σK2Tr4+σK3(Td4-Tr4), where σ=5.6704x10-8 W/(m2K4) (Stephan-Boltzmann's Constant), V=PIR thermopile voltage in µV, and Tr=Tc+VKr. The sensor is mounted on the instrument deck (unshaded and unheated). The Case Temperature (Tc) is also reported in degrees K. The Instrument Net Infrared is also reported, which is equal to the Downwelling IR (µV Signal) times the calibration factor K1. The SL-510 is a flat dome instrument, therefore it is easily contaminated by snow, rain, and moisture, which causes very large errors in downwelling infrared measurements. Data from the SL-510 should be used with extreme caution.
SP-510 Global Horizontal Apogee W/m2 12/01/2017 - 1171 see database (click S/N)
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by an Apogee thermopile sensor with calibration factor traceable to the World Radiometric Reference (WRR). An effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the ventilated downwelling CG4 and SL-510 case temperature) and Rnet = instruments effective net infrared response = 2.5 µV/W/m2.
CUV4 Total UV W/m2 08/14/2018 - 080019 see database (click S/N)
[DQS]
[Maint]		 Total Ultra-Violet radiation on a south-facing surface tilted 40 degrees from horizontal measured by a Kipp & Zonen CUV4. The spectral response of this instrument is shown in this plot.
SPP Diffuse Shading Disk Eppley (Ventilated) W/m2 01/23/2020 07/21/2022 see database see database (click S/N)
[DQS]
[Maint]		 Diffuse (Sky) shortwave irradiance measured by an Eppley SPP Pyranometer with calibration factor traceable to the World Radiometric Reference (WRR) mounted under the shading ball of a Sci-Tec tracker. As of 28-Jan-2020 @ 19:03MST, An effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the ventilated downwelling PIR) and Rnet = instruments effective net infrared response = 0.22 µV/W/m2. Note: The factory AC ventilator fan has been retrofitted with a 12 VDC fan.
MS-711 Global 2-Axis Spectral Data (WISER) W/m2/nm 01/27/2020 03/01/2023 S17157.04 see database
03/01/2023 06/08/2023 S14167.01 see database
06/08/2023 - S17157.04 see database
[DQS]
[Maint]		 EKO MS-711 Spectroradiometer with traceability to NIST Standard of Spectral Irradiance Lamps. The MS-711 instrument has 6.5nm spectral bandwidth and the detector is maintained at 25oC +/- 1oC. Data scan rate is 1 minute and instrument raw data output interval is 0.41nm, however data is interpolated to 1nm. Data above 900nm is discarded in favor of the MS-712 below.
MS-712 Global 2-Axis Spectral Data (WISER) W/m2/nm 01/27/2020 07/14/2021 S18070.01 see database
07/14/2021 06/22/2022 S13099.11 see database
06/22/2022 08/26/2022 S11120.02 see database
08/26/2022 09/05/2022 S18070.01 see database
09/05/2022 11/21/2022 S16059.01 see database
11/21/2022 - S13099.11 see database
[DQS]
[Maint]		 EKO MS-712 Spectroradiometer with traceability to NIST Standard of Spectral Irradiance Lamps. The MS-712 instrument has 5nm spectral bandwidth and the detector is maintained at -5oC +/- 1oC. Data scan rate is 1 minute and instrument raw data output interval is 1.6nm, however data is interpolated to 1nm.
SPLite2 2-Axis Global (Global Normal) Kipp & Zonen Silicon W/m2 03/27/2020 - see database see database (click S/N)
[DQS]
[Maint]		 Kipp & Zonen silicon pyranometer mounted on a two axis EKO STR-32G solar tracker on the SRRL south patio. The pyranometer is always normal to the sun (detector is perpendicular to direct irradiance).
CMP22 1-Axis Global Kipp & Zonen W/m2 03/27/2020 - see database see database (click S/N)
[DQS]
[Maint]		 Kipp & Zonen pyranometer mounted on a single axis EKO STR-32G solar tracker on the SRRL south patio. The 1-axis tracking is controlled by a CR850 data logger using NREL developed code.
SPLite2 1-Axis Global Kipp & Zonen Silicon W/m2 03/27/2020 - see database see database (click S/N)
[DQS]
[Maint]		 Kipp & Zonen silicon pyranometer mounted on a single axis EKO STR-32G solar tracker on the SRRL south patio. The 1-axis tracking is controlled by a CR850 data logger using NREL developed code.
LI-200R 1-Axis Global LI-COR Silicon W/m2 03/27/2020 - see database see database (click S/N)
[DQS]
[Maint]		 LI-COR silicon pyranometer mounted on a single axis EKO STR-32G solar tracker on the SRRL south patio. The 1-axis tracking is controlled by a CR850 data logger using NREL developed code.
CMP22 Global 40-South Kipp & Zonen W/m2 10/03/2019 - see database see database (click S/N)
[DQS]
[Maint]		 Total hemispheric solar irradiance on a south-facing surface tilted 40 degrees from horizontal. This is the solar resource for collectors with fixed-tilt, optimized for year-round performance.
LI-200R Global 40-South LI-COR Silicon W/m2 10/03/2019 - see database see database (click S/N)
[DQS]
[Maint]		 Total hemispheric solar irradiance on a south-facing surface tilted 40 degrees from horizontal. This is the solar resource for collectors with fixed-tilt, optimized for year-round performance.
SPLite2 Global 40-South Kipp & Zonen Silicon W/m2 04/10/2020 - see database see database (click S/N)
[DQS]
[Maint]		 Total hemispheric solar irradiance on a south-facing surface tilted 40 degrees from horizontal. This is the solar resource for collectors with fixed-tilt, optimized for year-round performance.
SolarSIM-G Global Horizontal SolarSIM-G W/m2/nm 04/30/2021 - 1057 see database
[DQS]
[Maint]		 Spectrafy SolarSIM-G spectral modeling device with traceability to NIST Standard of Spectral Irradiance Lamp Standards (through a spectroradiometer). The instrument has 9 narrow band wavelength channels then uses a model to generate spectral data from 280 to 4000nm. Raw data is collected every 20 seconds by a CR800 data logger and the MIDC web site uses the model to generate spectral data on-the-fly. See the SolarSIM-G page for more information and details on how to download large volumes of spectral data.
HMP-50 Relative Humidity (Radiometer Tower Logger Enclosure) % 05/19/2021 - D3530102 see database (click S/N)
[DQS]
[Maint]		 Relative humidity inside radiometer tower data logger enclosure measured with a Vaisala probe. Since this a sealed enclosure, humidity should be less than 70%.
MS-710 Global 40-South Spectral Data (WISER) W/m2/nm 04/28/2022 - S13098.13 see database
[DQS]
[Maint]		 EKO MS-710 Spectroradiometer with traceability to NIST Standard of Spectral Irradiance Lamps. The MS-710 instrument has 4nm spectral bandwidth and the detector is maintained at 25oC +/- 3oC. Data scan rate is 1 minute and instrument raw data output interval is 0.73nm, however data is interpolated to 1nm. Data above 900nm is discarded in favor of the MS-712 below.
MS-712 Global 40-South Spectral Data (WISER) W/m2/nm 04/28/2022 08/26/2022 S18070.01 see database
08/26/2022 01/27/2023 S11120.02 see database
01/27/2023 08/11/2023 S16059.01 see database
08/11/2023 - S18070.01 see database
[DQS]
[Maint]		 EKO MS-712 Spectroradiometer with traceability to NIST Standard of Spectral Irradiance Lamps. The MS-712 instrument has 5nm spectral bandwidth and the detector is maintained at -5oC +/- 1oC. Data scan rate is 1 minute and instrument raw data output interval is 1.6nm, however data is interpolated to 1nm.
MS-700 Upwelling Spectral Data W/m2/nm 04/06/2023 - S07125.02 see database
[DQS]
[Maint]		 EKO MS-700 Spectroradiometer with traceability to NIST Standard of Spectral Irradiance Lamp Standards. The instrument has 10nm spectral bandwidth and the detector is maintained at 25oC +/- 5oC. The usable spectral range of the instrument is 350 to 1050nm. Instrument is mounted on the SRRL Radiometer Tower facing the ground. Data is taken at approx 3.3nm intervals (slightly variable) every 60 seconds.
BTS2048-UV-S-WP Global UV Spectral Data W/m2/nm 11/21/2023 - 61190 see database
[DQS]
[Maint]		 Gigahertz-Optik BTS2048-UV-S-WP Spectroradiometer with traceability to PTB Standard of Spectral Irradiance Lamp Standards. The instrument has 0.8 nm spectral bandwidth and the core temperature is maintained at 38oC +/- 0.1oC. Instrument is operated using the "Solar BP SLC" mode which is optimized for the outdoor solar spectrum and the usable spectral range of the instrument is 285 to 400nm. Instrument is mounted on the SRRL instrument platform measuring global horizontal. Data is taken at 0.2 nm intervals every 5 minutes (2 minutes prior to 28-Nov-2023).
DR20 Direct Normal Hukseflux W/m2 01/04/2024 - 65089 see database (click S/N)
[DQS]
[Maint]		 Direct (Beam) shortwave irradiance as measured by an Hukseflux Model DR20 Pyrheliometer mounted on Sci-Tec Tracker #2 with calibration factor traceable to the World Radiometric Reference (WRR). Irradiance data is temperature corrected based on the formula: Irradiance = V * CF / (a*T2 + b*T +c), where V = thermopile signal in mV, CF is the calibration factor reported above, T is the DR20 case temperature in degrees C, and the temperature coefficients (a, b, and c) are reported above (in database link). The raw thermopile mV signal is also reported.
SR20 Global Horizontal Hukseflux W/m2 01/05/2024 - 15360 see database (click S/N)
[DQS]
[Maint]		 Total Hemispheric shortwave irradiance as measured by a Hukseflux pyranometer with calibration factor traceable to the World Radiometric Reference (WRR). An effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the ventilated downwelling PIR and ventilated SR25 case temperature) and Rnet = instruments effective net infrared response = 0.18 µV/W/m^2. Irradiance data is also temperature corrected based on the formula: Irradiance = Vc * CF / (a*T2 + b*T +c), where Vc = thermopile signal in mV (offset corrected), CF is the calibration factor reported above, T is the Global SR25 case temperature in degrees C, and the temperature coefficients (a, b, and c) are reported above (in database link). The SR20 is installed in an retrofited Eppley Ventilator with 12 VDC Fan.
SR20 Diffuse Shading Disk Hukseflux W/m2 01/05/2024 - see database see database (click S/N)
[DQS]
[Maint]		 Diffuse (Sky) shortwave irradiance measured by a Hukseflux Pyranometer mounted under the shading ball of a Sci-Tec tracker with calibration factor traceable to the World Radiometric Reference (WRR). An effective net infrared correction is applied to the voltage (V). Where, Vc = V - Wnet * Rnet, where Wnet = effective net infrared (from the ventilated downwelling PIR and ventilated SR25 case temperature) and Rnet = instruments effective net infrared response = 0.18 µV/W/m^2. Irradiance data is also temperature corrected based on the formula: Irradiance = Vc * CF / (a*T2 + b*T +c), where Vc = thermopile signal in mV (offset corrected), CF is the calibration factor reported above, T is the Global SR25 case temperature in degrees C, and the temperature coefficients (a, b, and c) are reported above (in database link). The SR20 is installed in an retrofited Eppley Ventilator with 12 VDC Fan.
Notes:
  • Site location:
    • 07-15-1981 to 06-30-1983: Southern base of South Table Mountain (STM) at interim site, located 1.2 km southeast and 90 meters below final location on top of STM.
    • 10-25-1984 to 07-31-2000: Old facilities on top of South Table Mountain (STM), Golden, Colorado.
    • 08-01-2000 to 10-31-2000: BSRN test pad on top of STM, during transition from old facility to the new SRRL laboratory and instrument deck.
    • 11-01-2000 to Present: New SRRL instrument deck and met tower on top of STM, Golden, Colorado.
  • Data output resolution:
    • 07-15-1981 to 04-07-1985 is 60-minute averages
    • 04-08-1985 to 01-11-1999 is 5-minute averages
    • 01-13-1999 to Present is 1-minute averages
  • Data sample rate (program execution interval):
    • 07-15-1981 to 01-11-1999 is 10-second samples
    • 01-13-1999 to 07-28-1999 is 2-second samples (30-second for Roof Temp, RH, & Press in Table 2)
    • 07-28-1999 to 07-31-2000 is 3-second samples (30-second for Roof Temp, RH, & Press in Table 2)
    • 08-01-2000 to 10-31-2000 is 1-second samples
    • 11-01-2000 to 08-03-2001 is 3-second samples (1-second for Met Tower)
    • 08-04-2001 to 11-12-2003 is 4-second samples (1-second for Met & Rad Towers)
    • 11-12-2003 to 01-06-2004 is 3-second samples (1-second for Met & Rad Towers)
    • 01-06-2004 to 09-12-2008 is 3-second samples (1-second for Met Tower)
    • 09-12-2008 to Present is 3-second samples (2-second for Met/PV Tower)
  • Data logger history:
    • Instrument Deck:
      • 07-15-1981 to approx 1993: Campbell Scientific CR21X
      • approx 1993 to 01-11-1999: Campbell Scientific CR10
      • 01-13-1999 to 07-31-2000: Campbell Scientific CR23X s/n 1162
      • 08-01-2000 to 10-31-2000: Campbell Scientific CR10 s/n ?
      • 11-01-2000 to 01-12-2007: Campbell Scientific CR23X s/n 1162
      • 01-12-2007 to 10-29-2007: Campbell Scientific CR23X s/n 3416
      • 10-29-2007 to 11-09-2012: Campbell Scientific CR23X s/n 1162
      • 11-09-2012 to 12-11-2014: Campbell Scientific CR3000 s/n 2080
      • 12-11-2014 to 02-24-2015: Campbell Scientific CR3000 s/n 9687
      • 02-24-2015 to Present: Campbell Scientific CR3000 s/n 2080
    • Meterological Tower:
      • 11-01-2000 to 11-12-2012: Campbell Scientific CR10X-1M s/n 09086
      • 11-12-2012 to 07-01-2015: Campbell Scientific CR10X-1M-TD s/n 09086
      • 07-01-2015 to Present: Campbell Scientific CR800 s/n 31258
    • Radiometer Tower:
      • 08-04-2001 to 11-12-2012: Campbell Scientific CR10X-1M s/n 09087
      • 11-12-2012 to 11-18-2014: Campbell Scientific CR10X-1M-TD s/n 09087
      • 11-18-2014 to Present: Campbell Scientific CR3000 s/n 9682
    • Single/Dual AXIS Patio Tracker:
  • Instrument mounting history since November 2000:
  • Tracker maintenance records since November 2004:

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