Equipment and Calibration
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History
| Rec No. | Date | Loc From | Title | Loc To | Notes |
|---|---|---|---|---|---|
| 1334 | 2014-06-06 | Lab none | Calibration | Lab none | Last calibration: 2011-10-06 Cell Pressure=138.28Torr, Cell Temperature=18.94C, Ring Time=13.434usec God CH4 at 1800psi CH4 Span=1.900ppm CH4 = 1.900 -> 1.900 Offset: 0ppb Notes: New NOAA God bottle. I did not see any offset or change in readings after cal. CO2 content of this tank was 394.92ppm (average of 186 readings). |
| 1333 | 2014-06-06 | Lab none | Calibration | Lab none | Last calibration: 2013-10-21 Cell Pressure=138.28Torr, Cell Temperature=18.94C, Ring Time=13.434usec God CO2 at 1750psi CH4 Span=ppm, CO2 Span=402.69ppm CH4 = -> Offset: 0ppb CO2 = 402.5 -> 402.69 Offset: 0.19ppm Notes: Co2 only. Really very close. I did not see any change in values after calibration |
| 748 | 2012-07-20 | Lab none | Calibration | Lab none | Last calibration: 2011-10-06 Cell Pressure=138.44Torr, Cell Temperature=21.50C, Ring Time=13.448usec CH4 in air at 500psi CH4 Span=3.228ppm, CO2 Span=410ppm CH4 = 3.228 -> 3.228 Offset: 0ppb CO2 = 413 -> 410 Offset: -3ppm Notes: CH4 was right on and not calibrated. Only calibrated for CO2. |
| 419 | 2011-10-06 | Lab none | Calibration | Lab none | This analyzer was calibrated withe the CH4 god bottle then used to measure the CH4 in a 400ppm CO2 secondary tank. In the process the LGR CO2 was calibrated with the scondary CO2 tank.
Last calibration of CH4 and CO2 was on 2011-08-29. The last calibration of H2O was on 2009-03-13. God bottel: 1.8978ppm CH4 350psi Secondary CO2: 405.85ppm CO2 -> CH4 determined to be 4.666ppm CH4 Pre-cal: 8:23PST, 21.67C, 138.20Torr, 13.403usec, 1Hz, 1.9140ppm CH4 After CH4 was 1.8980ppm. CO2 pre-cal: 8:29PST, 21.65C, 138.18Torr, 13.395usec, 1Hz, 4.666ppm CH4, 413.8ppm CO2 After CO2 was 405.5ppm |
| 400 | 2011-09-02 | Borrowed | Borrowed | Lab none | We re-borrowed this analyzer from Frank of continued soil respiration in the lab. |
| 399 | 2011-08-22 | Lab none | Returned | Returned | Returned to Frank for chamber campaign on Twitwell ponds during the week of August 22nd, 2011 |
| 356 | 2011-05-13 | Lab none | Maintenance | Lab none | On first power up CH4 and H2O did not line lock. I adjusted the VO setting in the linelock_0.ini file from -0.690 to -0.590.
I did a calibration with the CH4 god bottle 1.8978ppm CH4, 350psi. Last cal was: CH4 - 14 Jul 2010 H2O, CO2 - 13 Mar 2009 Precal: 14:26PST, 22.77C, 138.11Torr, 14.052usec, 1Hz, 2.058ppm After cal: 1.9021ppm |