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ECSU Instrument Descriptions and Histories


Model Measurement
Notes (below)		 Units Install
Date		 Removal
Date		 Current
SN		 Current
CF
PSP Global Horizontal W/m2 09/03/1985 04/04/2004 25823F3 101.73 W/m2/mV
04/05/2004 03/11/2008 31256F3 132.25 W/m2/mV
03/11/2008 - 31392F3 135.21 W/m2/mV
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).
PSP Diffuse SB W/m2 09/03/1985 1994 - -
1998 04/04/2004 25819F3 110.25 W/m2/mV
04/05/2004 03/11/2008 17880F3 123.96 W/m2/mV
03/11/2008 - 31393F3 130.18 W/m2/mV
Diffuse (Sky) shortwave irradiance measured by a PSP mounted under a manually-adjusted shadow band. Data from July 14, 1995 through March 31, 2004 are NOT adjusted for the presence of the shadow band (a 10% to 18% increase is needed, depending on solar declination for the day of data).
NIP Direct Normal W/m2 03/01/1990 04/04/2004 17830E6 119.82 W/m2/mV
04/05/2004 03/11/2008 25521E6 124.47 W/m2/mV
03/11/2008 - 23398E6 139.96 W/m2/mV
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. As of April 1, 2004, the estimated broadband Aerosol Optical Depth (AOD) is also calculated using this instrument.
PSP Diffuse SD W/m2 1994 1998 - -
The Eppley PSP is mounted in a tracker which has a shading disk (SD).
HMP 35 Dry Bulb Temperature and Relative Humidity (Tower) oC
%		 07/14/1995 - - 1 oC/mV
0.1 %/mV
Ambient air temperature measured with a Vaisala probe (also measures RH) inside in a naturally aspirated radiation shield mounted on a tower. As of April 1, 2004, dew point temperature is also calculated using both the temperature and RH. As of April 1, 2004, the wind chill temperature is also calculated using the new National Weather Service (NWS) method as described on the NOAA web site, however the wind speed used is measured on the roof at approx. 50' instead of the 5' level required by the NWS calculation.
NRG #200 Wind Speed m/s 07/14/1995 - - 0.76171 m/s/Hz
Measured by a 3-cup anemometer mounted on a tower. Peak Wind Speed is also recorded, which is the the maximum 10-sec anemometer reading during the 5-minute interval.
NRG #200 Wind Direction o from N 07/14/1995 - - 0.1408 o/mV
Measured by a wind vane mounted on a tower.
PTA427 Pressure mBar 07/14/1995 - - 0.104 mBar/mV+800mBar
The Vaisala Pressure Transmitter is mounted inside the CR10 enclosure. The data are NOT adjusted to sea level conditions.
TRP525I Precipitation Gauge (tipping bucket)
Texas Electronics Inc.		 mm 07/14/1995 05/26/1997 14928 395 0.254 mm/count
The precipitation gauge got damaged and was removed from service. The instrument was later repaired and installed in the SRRL Baseline Measurement System (BMS).
CR10-T CR10 Temp oC 07/14/1995 - - -
CR10 internal temperature.
(calc) Zenith Angle o 04/01/2004 - - -
Solar zenith angle (refracted). Calculated after datacollection (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 04/01/2004 - - -
Solar azimuth angle. Calculated after datacollection (outside the datalogger) using the Solar Position Algorithm (SPA) and added to the datastream. Prior to June 21, 2004, SOLPOS was used.
(calc) Airmass - 04/01/2004 - - -
Relative optical airmass (not pressure corrected). Calculated after datacollection (outside the datalogger) using the Solar Position Algorithm (SPA) and added to the datastream. Prior to June 21, 2004, SOLPOS was used.
CR10-B CR10 Battery Voltage oC 05/21/2004 - - -
CR10 external battery voltage.
Notes:
  • Data Sample rate is 10-sec, with 5-min averages. As of May 21, 2004, the sample rate was changed to 4-sec.
  • Raw data files were downloaded directly from Campbell Scientific CR-10 datalogger using LoggerNet.

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