Campbell Scientific EC155 CO2 and H2O Closed-Path Gas Analyzer and EC100 Electronics with Optional CSAT3A 3D Sonic Anemometer - Manual (Page 46)

EC155 CO
2
and H
2
O Closed-Path Gas Analyzer
FIGURE 9-8. Replacing the detector housing desiccant/scrubber bottle
9.6 Factory Recalibration
When the EC155 is manufactured, it goes through an extensive calibration
process, covering a wide range of temperatures, pressures, and gas
concentrations. All CO
2
calibration gases used in this process are mixtures of
CO
2
in ambient air traceable to the WMO Mole Fraction Scale maintained by
the Central Carbon Dioxide Laboratory and the Carbon Cycle Greenhouse
Gases Group of the Global Monitoring Division/National Oceanographic and
Atmospheric Administration in Boulder, CO, USA.
After an extended period of time in the field, the EC155 may need to undergo
this factory calibration again in order to ensure valid measurements. When
recalibration is deemed necessary, contact Campbell Scientific.
For the CSAT3A, refer to the CSAT3A instruction manual for information on
recalibration.
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