| Date: |
2022-01-11 |
| From: |
Lab - |
| To: |
Lab - |
| Title: |
Calibration |
| Notes: |
Last calibration: 2021-12-09
AGC=99.8 SDM= DAC1= DAC2=
Ambient P=101.8kPa, Tair=27.8C, Tdew=6.5C
Zero Air at 1000psi, AMP CA04119 524.77 at 1675 Tdewspan=20.00
CO2 zero 0.9048 -> .9049 Offset: -.47ppm
CO2 span 1.0101 -> 1.0047 Offset: 3.73ppm
H2O zero 0.8413 -> .8391 Offset: -15.1ppm
H2O span 1.0349 -> 1.0087 Offset: .57ppm
Notes: Second calibration in a month because there was a big jump of 14ppm CO2 when I installed this sensor at BA on 12/14/2021 and removed sn 0035. I took this sensor off from BA on 1/2/2022 to calibrate again and replaced it with sn75H-2176. This time though the CO2 values were very close, so maybe the problem was actually with sn 0035, not this sensor. However, during this calibration the CO2 span offset was 3.73ppm, which is larger than usual. There was also a large H2O zero offset of -15.1 mmol/m3. I thought about changing its chemicals, but they were just changed a year ago so they're probably ok. I will calibrate it again next week to check.
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