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For process and zero air free of CnHm and CO. The catalytic gas purifier also removes hydrocarbons and CO from the treated zero gas. This gas free of HC and CO is suitable as process and carrier gas for gas chromatographs and to produce calibration gas for CO/HC analyzers.
To set a defined level of moisture for zero and span gases. The zero and span gas and sometimes the carrier gas as well might have to be set to a defined moisture level in order to obtain reproducible analysis values.