| Date: |
2025-05-08 |
| From: |
Lab - |
| To: |
Lab - |
| Title: |
Calibration |
| Notes: |
Last calibration: 2025-01-07
AGC=99.5 SDM=7 DAC1=- DAC2=-
AIU sn AIU-2652, Presure A0=59.516, A1=15.503
Ambient P=101.0kPa, Tair=19.1C, Tdew=9.8C
Zero Air at 100psi, AMP CA03923 488.75 at 1200 Tdewspan=13.0
CO2 zero 0.941 -> 0.9418 Offset: ppm
CO2 span 1.0165 -> 1.0218 Offset: ppm
H2O zero 0.8454 -> 0.8421 Offset: ppm
H2O span 1.0393 -> 1.0332 Offset: ppm
Notes: I started to calibrate this head yesterday but the H2O zero offset was large ~-30 and opposite for the third time. I decided to swap the internal chemicals - they were hard and needed a screw driver to pry out of the bottles. I tried to flush the body with zero air but the zeros were still high ~18ppm CO2. I let it run overnight. The chopper is a little noisy and I had to use 0.1ppm less to get the CO2 span to read right.
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