Campbell Scientific IRGASON Integrated CO2/H2O Open-Path Gas Analyzer and 3D Sonic Anemometer - Manual (Page 43)

IRGASON ® Integrated CO
2
/H
2
O Open-Path Gas Analyzer and 3D Sonic Anemometer
excessively (see Section 9.4, Zero and Span), the bottles should be replaced.
To do this, twist the scrubber-bottle covers of the upper and lower arms
counter-clockwise until they detach (they should loosen by hand). Remove the
IRGASON chemical bottles (pn 26510) from inside the covers, and replace
them with new bottles lid-first (see FIGURE 9-6). Once this is done, firmly
screw the covers back on the arms. Allow the sensor to equilibrate for at least
24 hours (longer if in high humidity), and then perform a zero-and-span
procedure. If readings continue to be suspect, the sensor may need factory
recalibration (see Section 9.6, Factory Recalibration).
The scrubber bottles contain strong oxidizing agents. Avoid
direct contact with the chemicals inside the bottles. Also,
ensure your work area is well ventilated and free of any
reactive compounds, including liquid water. Store used
chemical bottles in a sealed container until disposal.
The chemical bottles should be disposed of according to local and federal
regulations. For more information, MSDS (Material Safety Data Sheets) for
the chemicals are available in Appendix C and at www.campbellsci.com .
FIGURE 9-6. Replacing the desiccant and CO2 scrubber bottles
9.6 Factory Recalibration
When the IRGASON is manufactured, the gas analyzer calibrated over 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 and are traceable
to the WMO Mole Fraction Scale maintained by the Central Carbon Dioxide
Laboratory and the Carbon Cycle Greenhouse Gases Group of the Global
DANGER
Scrubber bottle cover
Scrubber bottle cover
33