Equipment and Calibration History
History for Los Gatos Research FGGA 09-0010
| Rec No. | Date | Loc From | Title | Loc To | Notes |
|---|---|---|---|---|---|
| 337 | 2011-03-21 | Lab none | Adjusted | Lab none | I had to adjust the line lock for CH4 and H2O again. I changed it from 0.245 to 0.255. Also some strange computer lock up pausing on boot. But seems okay. |
| 219 | 2010-09-29 | Moffett Field | Removed | Lab none | Removed with portable tower from the zero flux study at Moffett Field. |
| 212 | 2010-09-23 | Lab none | Installed | Moffett Field | This analyzer was installed with a portable tower at Moffett Field for a week long zero flux study. |
| 201 | 2010-09-07 | Lab none | Maintenance | Lab none | This analyzer ran in the lab with no flow in slow flow mode and the cell pressure started close to 138Torr and fell slowly. I replaced the internal 2um filter with no improvement. A high flow of lab bench air through the filter before installing seems to have cleaned the down stream side of the filter and did not foul the mirrors.
I bought a new pressure controller from LGR ($720) and installed it. Cell pressure was 138Torr and holding steady with good flow. I had to change the linelock v0 value from 0.215 to 0.225 to get CH4 and H2O to lock. |
| 179 | 2010-08-17 | Twitchell Rice | Removed | Lab none | Removed from Twitchell for low to no flow in slow flow mode. Need to trouble shoot in the lab. |
| 1485 | 2010-06-22 | Twitchell Rice | Calibration | Twitchell Rice | Initial readings from the LGR were:
9:57, 29.18C, 129.50Torr, 13.902usec, 10Hz, 1.865ppm, 14819ppm, 385.91ppm I tried calibrating and notice very low pressure in low flow mode � 74.89Torr. I completed the calibration, but did not like it. I checked the exterior 2um filter and it seemed okay. I also checked the internal 2um filter and it seemed good as well. In checking the interior I noticed a loose connection. The connector that has to be disconnected to clean the mirror was left disconnected last time I cleaned the mirrors. I�m asking LGR what this connection does. It doesn�t look significant but after connecting it the pressure improved somewhat. And I did a second calibration. Precal: last cal June 3, 3.276ppm CH4, 433.0ppm CO2, 1800psi 10:54, 134.32Torr, 3.217+-0.003ppm CH4, 416+-2ppm CO2 Post cal: 10:57, 130.0Torr, 3.276+-0.002ppm CH4, 433+-1ppm CO2 Last readings from LGR: 11:02, 28.57C, 144.47Torr, 13.86usec, 10Hz, 1.888ppm, 15195ppm, 400.44ppm |
| 1484 | 2010-06-03 | Twitchell Rice | Calibration | Twitchell Rice | Calibrated with 3.276ppm CH4 and 433.0ppm CO2 tank 1750psi. Last cal May 20, 2010
Precal: 10:26, 129.6Torr dropping to 119Torr, 3.30+-0.05ppm CH4, 430+-1ppm CO2 Postcal: 3.26+-0.001ppm CH4, 429+-1ppm CO2 System back at 10Hz. |
| 1483 | 2010-05-20 | Twitchell Rice | Calibration | Twitchell Rice | calibrated the LGR:
Initial readings: 9:35, 19.99C, 138.24Torr, 14.071usec, 10Hz, 1.8530ppm, 8187ppm, 406.97ppm bypass valve adjusted to 143.55Torr. Calibrated with 3.276ppm CH4, 433.0ppm CO2 tank with 1800psi Pre cal: 9:41, 138.16Torr, 1Hz, 3.220+-0.005ppm, 444+-1ppm Post cal: 9:48, 3.278+-0.002ppm, 432+-1ppm Ambient conditions after calibration: 9:50, 20.02C, 143.90Torr, 14.069usec, 10Hz, 1.8610ppm, 8332ppm, 390.55ppm |
| 1482 | 2010-05-05 | Twitchell Rice | Calibration | Twitchell Rice | Twitchell: cal gas 3.276 ppm CH4, 433ppm CO2, mirror 13.9 us, 145 Torr, 37C
CH4 pre-cal: 3.342 CO2 pre-cal: 441 CH4 post-cal: 3.273 CO2 post-cal: 433 |
| 1481 | 2010-04-22 | Twitchell Rice | Calibration | Twitchell Rice | The LGR would not line lock CH4/H2O when power was restored. Initially the cell temperature was about 10C and I let it warm up to 18C with no lock and many restarts. Finally I called LGR and got their maintenance password to change line lock settings from 0.165 to 0.185 and this did the trick.
Initial readings 11:35, 18.50C, 144.60Torr, 13.940usec, 10Hz, 2.149ppm, 12039ppm, 398.07ppm Calibrated with 3.276ppm CH4, 433.0ppm CO2 tank, last cal Mar 11, 2010 Precal 11:40, 138.24Torr, 3.270+-0.002ppm CH4, 425.0+-1ppm CO2 Postcal: 11:44, 138Torr, 3.279+-0.002ppm CH4, 433.5+-1ppm CO2 |
| 2142 | 2010-04-08 | Twitchell Rice | Calibration | Twitchell Rice | Last calibration: 2010-03-11
Cell Pressure=134.99Torr, Cell Temperature=26.64C, Ring Time=14.014usec 2nd Standard at 1900psi CH4 Span=3.276ppm, CO2 Span=433.0ppm CH4 = 3.302 -> 3.305 Offset: -0.026ppm CO2 = 436 -> 439 Offset: -3ppm Notes: Seems to have made it worse? |
| 71 | 2010-03-04 | Lab none | Installed | Twitchell Rice | This analyzer was installed at twitchell so that the other one could be removed for maintenance. This anaylzer had inital line lock problems, but has running properly when I left. |
| 2141 | 2010-03-03 | Lab none | Calibration | Lab none | Last calibration: 2010-01-14
Cell Pressure=138.16Torr, Cell Temperature=20.17C, Ring Time=13.987usec God CH4 at psi CH4 Span=1.8978ppm, CO2 Span=382.50ppm CH4 = 1.834 -> 1.903 Offset: 0.064ppm CO2 = 354 -> 383 Offset: 28.5ppm Notes: Testing with CH4 standard 4.978ppm CH4 and 3ppm CO2 LGR reading: 4.785ppm +- 9ppb CH4 CO2 reading -1.00 Maybe out of range Testing with CO2 standard 597.4ppm CO2 ??ppm CH4 LGR reading: 2.701ppm +- 9ppb CH4 LGR reading: 582ppm +-4ppm CO2 This analyzer seems noisier than the single channel. Will check other FGGA analyzer after swap. |
| 69 | 2010-03-03 | Borrowed | Initial Notes | Lab none | This analyzer was borrowed from Frank Anderson |