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SRRL Ancillary Instrument Descriptions and Histories


Model Measurement
Notes (below)		 Units Install
Date		 Removal
Date		 Current
SN		 Current
CF
HMP-45C Dry Bulb Temperature and Relative Humidity (Optics Lab) oC
%		 07/11/2011 - U3140041 0.1 oC/mV-40oC
0.1 %/mV+3%
Ambient air temperature and relative humidity measured with a Vaisala probe, approx 2 feet above the floor on the east side of the optics table which is located in the appox center of the SRRL Optics Lab. Prior to 10/11/2011 it was located near the center of the north wall approx 6 feet above the floor. Prior to 9/16/2011 it was located near the center of the south wall approx 7 feet above the floor.
HMP-35C Dry Bulb Temperature and Relative Humidity (Optics Lab Duct) oC
%		 11/11/2013 - ? 0.1 oC/mV-40oC
0.1 %/mV
Ambient air temperature and relative humidity measured with a Vaisala probe inside the HVAC ceiling duct that supplies Optics Lab. Probe is mounted at exit of north register.
HMP-45C Dry Bulb Temperature and Relative Humidity (Staging Area) oC
%		 06/17/2014 - D3050012 0.1 oC/mV-40oC
0.1 %/mV
Ambient air temperature and relative humidity measured with a Vaisala probe mounted near north east corner of Indoor Staging Area about 8 feet above the ground. On 8-24-2018 the probe was relocated near center of Indoor Staging Area about 8 feet above the ground.
HMP-45C Dry Bulb Temperature and Relative Humidity (MetLab Main) oC
%		 01/08/2015 08/09/2016 T2410055 0.1 oC/mV-40oC
0.1 %/mV
Ambient air temperature and relative humidity measured with a Vaisala probe mounted on top of cabinet on east wall of metrology lab.
DEWK Dry Bulb Temperature and Relative Humidity (MetLab Main & Shield) oC
%		 08/09/2016 - A69029 N/A
Ambient air temperature and relative humidity measured with a Fluke 1620A "DEWK" thermo-hygrometer. A CR800 data logger reads from DEWK every 1 second using the RS-232 port to produce 1 minute averages. Probe for Main is located in north west corner of MetLab (above shield room door) and the probe for the sheild room is located on south wall about 10 feet above the ground.
03001 Wind Speed R.M. Young (Instrument Deck) m/s 09/24/2008 08/31/2016 2008-2 0.75 m/s/Hz+0.2 m/s
[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. Anemometer is measured in parallel with SRRL Baseline Measurement System (BMS) every 3-seconds. Peak Wind Speed was also recorded, which is the maximum 3-second anemometer reading during the 1-minute interval.
- WS 50 and 60 MPH Event Alert (Count) counts 05/21/2015 - - -
The number of times a back-to-back 3-second reading exceeded the 50 or 60 MPH threshold during the 1 minute period. As of 9/1/2016, the wind speed at 22 feet is used instead of 19 feet and sample rate is 2-second (instead of 3).
- WS 50 and 60 MPH Event Alert (Flag) counts 05/21/2015 - - -
The flag is set to 1, when a back-to-back 3-second reading exceeded the 50 or 60 MPH threshold during the 1 minute period. The flag is held at 1 until no more events occur for 30 minutes, then it returns to 0. During the same period that these two flags are set to 1, two corresponding data logger control ports are set high (5 Volts). As of 9/1/2016, the wind speed at 22 feet is used instead of 19 feet and sample rate is 2-second (instead of 3), also control ports are no longer set high.
- CR800 Process Time (Maximum) s 09/15/2015 - - -
The maximum time it took for the CR800 (for solar trackers) to execute its program during the 1-minute interval. The program is currently scheduled to run every 1 second, therefore value should not exceed 1 second.
2AP
Brusag
STR23G		 Clock Status Code varies 09/15/2015 - - -
The CR800 data logger (and a multiplexer) is used to check and maintain solar tracker clocks using RS-232 communication, the status codes reported by the data logger are as follows:
  • -2: Data logger failed to communicate with tracker
  • -1: Data logger did not check tracker clock (clock is only checked at night)
  • >=0: A zero or positive integer number indicates the absolute difference between the data logger clock and the tracker clock in seconds. Note: The data logger will attempt to reset the tracker clock if this difference exceedes 5 seconds.

Note: As of July 12, 2017 the BORCAL trackers were upgraded from Brusag to EKO STR32G. The data logger will not attempt to set the STR23G time, since its maintained by GPS.
LFI-3525 LI-1800 TEC Status varies 12/01/2015 09/14/2017 - -
NREL has modified the LICOR LI-1800 spectroradiometers with a TEC mounted on the Silicon detector housing to maintain a constant temperature. The TEC Controler (Model LFI-3525) has analog outputs to monitor the status of the system, including current temperature (thermistor mounted on Si photodiode case), setpoint temperature, TEC current, etc.
(varies) Research Channels (varies) 10/27/2017 - - -
[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. Measured using a Campbell Scientific CR1000X s/n 1085 or CR3000 s/n 5391
DCU060100 SRRL Power VAC 08/30/2018 - - 156.41 VAC/VDC
Monitor of AC Line Power calculated by measuring output of 6V AC/DC unregulated power adapter (Jameco DCU060100). Power supply output is loaded with a 25 Ohm/25 Watt resitor to blead off rectifier capasitor during power brownouts/blackouts. A 10:1 voltage divider is used to measure voltage using staging area datalogger. Data sample rate is approx 30 milliseconds with the 1 minute average, minimum, and maximum reported. Please note that the min/max will measure the typical ripple from rectifier.

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