Equipment and Calibration

Equipment Entry

Instrument:	Infrared Temperature
Manufacture:	Apogee
Model No:	SI-121
Serial No:	1964
Tag No:
Acquisition Date:	2015-04-22
Project:	Ameriflux
Location on 2024-04-30:	Lab,
Notes:	Replacing old SI-121 sensor that was traded in. Narrow field of view 18deg half-angle, 0.6sec response time, analog outs. Coefficients: mC2 = 1.19642e5 mC1 = 1.10613e7 mC0 = 1.89441e9 bC2 = 2.67874e3 bC1 = 6.90193e4 bC0 = -1.33937e7

Rec No.	Date	Loc From	Title	Loc To	Notes
6694	2024-04-30	Lab none	Repair	Lab none	The cows had chewed the cable very nearly down to the nub. I had to cut some of the strain relief off to get enough conductor to splice. I added a length of cable and then spliced the end on that has a completion resistor for the thermmistor half bridge. So two splices. It compared withing 0.5C with the other IRT in the window - as good as you get without a fancier setup.
6693	2024-04-10	Tonzi Infrared Temperature Grass A	Removed	Lab none	Removed from the IRT tripod at Tonzi where it was pointed at the ground. The cows ate its cable.
1807	2015-05-06	Lab none	Installed	Tonzi Infrared Temperature Grass A	Installed at Tonzi to the east just north of the road. This sensor is point down on a patch of ground cleared of grass.