| Date: |
2023-12-03 |
| From: |
Lab - none |
| To: |
Lab - none |
| Title: |
Calibration |
| Notes: |
Zero Air, >500psi, Last zero ??
CH4 zero offset: -7.601ppb
CO2 zero offset: 6.771ppm
AMP CA04119, 4223.8 ppb CH4, ??ppm CO2, >500psi, Last span ??
CH4 span offset: 30.72ppb
CO2 span offset: ??
Previous weight: ??
New weight: ??
Notes: First calibration in the lab for UCSC sn TG10-01589. 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 forgot to write down the psi for both tanks, but they should be both >500psi based on notes from other calibrations from around this time. I waited for more than 45min for H2O zero to stabilize, however at AGU I talked w/ Graham from Licor and he said we actually don't need to wait that long for the zero, Since the software only calibrates the CO2 zero, we actually just need to wait for CO2 to stabilize. For our own TG10 analyzer, we also had a large H2O zero offset for our first calibration (offset of -90ppm), but it was much more reasonable for the second calibration (offset of -10ppm). |
| Entered by: |
Daphne Szutu |
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