Equipment and Calibration
View History
Equipment Entry
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Documents
Manual: Collecting_LI-7700_Ethernet_Data.pdfManual: LI-7700_Manual_V2_201103.pdf
Manual: LI-7700_Manual_V3_201312.pdf
History
| Rec No. | Date | Loc From | Title | Loc To | Notes |
|---|---|---|---|---|---|
| 7273 | 2025-06-09 | Lab none | Installed | Berkeley Way West none | Installed on the BWW tower to replace sn TG1-0424 for calibration. This sensor was connected to the 7550 in the software and the 7550 had good CH4 numbers on the screen. |
| 7267 | 2025-06-03 | Lab | Calibration | Lab | Calibration Location: Lab Last calibration: 2025-04-25 RSSI=84.4%, Optical RH=11% Ambient P=100.56kPa, Tair=19.4C Zero Air at 1900psi, AMP CA04395 1.9317 at 1300 CH4 Zero Offset: 0.015ppm CH4 Span Offset: -0.013ppm Notes: First calibration after replacing pressure sensor that burned up after getting wet from water that leaked in to the 7700 body. Pressure coefficients update in the factory settings. All seemed well. |
| 7266 | 2025-05-30 | Lab none | Repair | Lab none | Long story - didn't all happened on the 30th. This unit was calibrated on 4/25 and the pressure was a little funky. I tried to put it on the Tonzi Tower on 4/29 but the pressure was reading bad. I brought it back in to test. I took it apart in the lab to check for loose wires but discovered it had a bunch of water in it. Nothing looked corroded though. I let it dry out over the weekend then put it back together to test. The pressure was worse and then it also lost its line lock. I asked Licor how much time/money it would take for them to service it: 6-8weeks and 00! I asked if I could replace the pressure sensor: yes - same one as 7550 boxes: 5. I took it apart again and found the pressure sensor had burned up. I removed the dead pressure sensor and the 7700 worked. I swapped in a 7550 pressure sensor and it was still good. I ordered a new pressure sensor.
I got a new pressure sensor sn PX-5118 and eventually the calibration coefficients for the new sensor: P zero=58.80, span=15.41. On 6/03 I updated the 7700 pressure coefficients and calibrated it. To set the 7700 pressure coefficients choose "About" from the question mark menu and the "factory setup". "Proceed" from warning box then "Watch" the 7700. Finaly use the "Factory..." button to see and change the settings. "Commit" when done. Additionally I did a small inter-comparison of pressures from the new 7700 sensor, a brand new Campbell BaroVue10 sn 4337/4348 and a new 7550 box sn AIU-2562. With the use of the coefficients for the new sensor the 7700 pressure was right in line with the BaroVue sensor. |
| 7203 | 2025-04-25 | Lab | Calibration | Lab | Calibration Location: Lab Last calibration: 2024-10-07 RSSI=84.6%, Optical RH=10% Ambient P=100.37kPa, Tair=15.7C Zero Air at 200psi, AMP FB04304 1.9024 at 700 CH4 Zero Offset: -0.026ppm CH4 Span Offset: 0.022ppm Notes: Pressure took a long time to stabilize but eventually looked good matching weather apps and 7500. |
| 7205 | 2025-04-17 | Tonzi Gas Analyzer CH4 Floor | Removed | Lab none | Removed from Tonzi Floor for calibration. Replaced by sn TG1-0216. |
| 6905 | 2024-10-10 | Lab none | Installed | Tonzi Gas Analyzer CH4 Floor | Installed on the Floor tower by adding a new mount using L-brackets and a rail fitting removing existing Allen screws and reusing the sockets for standard 1/4-20 bolts. No wash box, hat but no spikes. |
| 6901 | 2024-10-07 | Lab | Calibration | Lab | Calibration Location: Lab Last calibration: 2021-07-12 RSSI=79%, Optical RH=21% Ambient P=100.2kPa, Tair=31.5C Zero Air at 1400psi, AMP FB04035 1.19156 at 1000 CH4 Zero Offset: -0.057ppm CH4 Span Offset: 0.0704ppm Notes: First check of instrument from USGS. Last zero was 2023-09-08. Clock 25min behind, set heater and wash to Biomet Default. TC was dead, swapped with repaired one. Initial span used ppb instead of ppm so off by a factor of 1000. Redid span on 10/08 with different tank - seemed fine less than ppb off. |