| Date: |
2024-08-12 |
| From: |
Lab - none |
| To: |
Lab - none |
| Title: |
Calibration |
| Notes: |
Last zero 2023-12-01
Zero Air, 1450psi
CH4 zero offset: 3.4ppb
CO2 zero offset: -2.8ppm
Last span 2023-12-01
AMP CA03923, 3386.5ppb CH4, 488.75ppm CO2, 1500psi
CH4 span offset: -1.25ppb
CO2 span offset: 0.96 ppm
Previous weight: 0.9980
New weight: ??
Notes: Calibration in the lab before Kuno's field campaign next week. Ran zero and span gases at our usual flow rate of 2 SCFH and plumbed the system with the recommended 30cm vent before the air inlet to vent excess air pressure and to prevent diffusion of ambient air into the gas stream. I spoke with a Licor technical person at AGU (Graham I think) who said that because the laser is tuned to methane, we only need to wait for CH4 to stabilize for the calibration (don't need to wait for H2O). |
| Entered by: |
Daphne Szutu |
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