Equipment and Calibration

Equipment Entry

Instrument:	Infrared Temperature
Manufacture:	Apogee
Model No:	SI-121
Serial No:	1965
Tag No:	NULL
Acquisition Date:	2015-04-22
Project:	Ameriflux
Location on 2024-04-30:	Lab, NULL
Notes:	Replacing old SA-121 sensor that was traded in. Narrow field of view 18deg half-angle, 0.6sec response time, analog outs. Coefficients: mC2 = 1.08768e5 mC1 = 1.05487e7 mC0 = 1.82939e9 bC2 = 2.63346e3 bC1 = 1.75985e5 bC2 = -4.94396e6

Rec No.	Date	Loc From	Title	Loc To	Notes
6692	2024-04-30	Lab none	Repair	Lab none	I spliced this cable back together where the cow chewed it. The end has a completion resister for the thermistor half bridge. A quick test in the lab window shows it matches the other IRT within 0.5C - as good as you get without a fancier setup.
6683	2024-04-22	Tonzi Infrared Temperature Tree Crown	Removed	Lab none	Removed from the IRT tripod because cows had chewed the wires off.
1806	2015-05-06	Lab none	Installed	Tonzi Infrared Temperature Tree Crown	Installed at Tonzi to the east just north of the road. This sensor is point down on top of a small tree.