Campbell Scientific IRGASON IRGASON Integrated CO2/H2O Open-Path Gas Analyzer - Page 43

IRGASON® Integrated CO2/H2O Open-Path Gas Analyzer and 3D Sonic Anemometer DANGER 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. Scrubber bottle cover Scrubber bottle cover 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 CO2 calibration gases used in this process are mixtures of CO2 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 33