Equipment and Calibration History

History for Vaisala GMP221 K1340007

Rec No.	Date	Loc From	Title	Loc To	Notes
1875	2015-06-09	Twitchell Alfalfa	Removed	Lab none	Removed from Set A at -8cm with upgrade of soil CO2 system
1862	2014-08-13	Lab none	Installed	Twitchell Alfalfa	Installed near the radiometers at Alfalfa in Set A to the south at -8cm
2090	2014-04-10	Lab none	Installed	Sherman Island	Installed in Sherman profile A at -8cm to replace sn F4960019
1452	2014-04-07	Lab none	Calibration	Lab none	Trueppm = Probeppm*1.01 + -11.96; linear relationship between the ppm reported by the probe and the known ppm of the calibration tanks. Tanks: zero air (0ppm), 2238ppm, 3056ppm, and 10000ppm. Ta=25.8C, P=101.9kPa. Because the lab conditions were close to factory conditions, no temperature or pressure corrections were applied. Done by: Joe.