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 2024-06-04:	Tonzi,
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
6878	2024-06-04	Lab none	Installed	Tonzi Infrared Temperature Tree Crown	Reinstalled at the little tree northeast of the Tower at Tonzi after having been removed to repair massive cable damage from cows. This sensor is pointed at the tree crown.
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.