Equipment and Calibration History

History for Los Gatos Research FGGA 09-0012

Rec No.	Date	Loc From	Title	Loc To	Notes
193	2010-04-09	Lab none	Returned	Returned	Returned to Frank Anderson for Twitchell ponds.
72	2010-03-04	Twitchell Rice	Removed	Lab none	This analyzer was removed from Twitchell for mainenance - low pressure on internal pump. It is now in the lab.
1479	2010-02-18	Twitchell Rice	Calibration	Twitchell Rice	Last calibration: 2010-01-14 00:00:00 Cell Pressure=39.54kPa, Cell Temperature=27.98C, Ring Time=17.17usec 2nd standard at 0psi: CH4: 3.276ppm, CO2: 433ppm, H2O: 0ppm CH4 = 3.5032ppm -> 3.316ppm Offset: -0.227ppb CO2 = 448.8ppm -> 441ppm Offset: -15.8ppm Notes: External filter seemed plugged up, swapped it with cleaned filter before calibration. Values improved, but I still don't agree with cal tank. I think the very low pressure is a problem. Maybe the internal filter is plugged up. I will do some check in the lab and then possibly swap out the LGR.
1477	2010-01-14	Twitchell Rice	Calibration	Twitchell Rice	Last calibration: 2009-03-03 00:00:00 Cell Pressure=148.63kPa, Cell Temperature=28.27C, Ring Time=17.277usec 2nd Standard at 0psi: CH4: 3.276ppm, CO2: 433ppm, H2O: 0ppm CH4 = 3.368ppm -> 3.275ppm Offset: -0.092ppb CO2 = 432.1ppm -> 433.4ppm Offset: 0.9ppm Notes: LGR pressure very low ~16Torr, but very easily adjusted using bypass valve.
1478	2009-08-06	Lab none	Installed	Twitchell Rice	Installed Frank's FGGA at the rice