| Date: |
2010-10-13 |
| From: |
Lab - none |
| To: |
Lab - none |
| Title: |
Calibration |
| Notes: |
Clibrated in the lab with grade 5.0 ultra pure N2 (40psi to empty) and 1.8978ppm CH4 god bottle (300psi). New fine wire thermocouple installed before calibration. Mirrors cleaned with rubbing alcohol and soft cloth.
Air T=27.9C, P=100.55kPa, RSSI=78%
Zero seemed right on flucuating about 5ppb around zero. I did not set the zero.
The span was a little off reading 1.842ppm about 50ppb short. I set the span.
I checked it with a scondary CH4 standard determined with an LGR at 4.982ppm CH4. The Li7700 read 5.050. |
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