Abstract
A study has been made of a systematic error of up to 20% which occurs in the analysis of gas mixtures for their carbon dioxide content using simple infra-red absorption analysers. This error was traced to pressure broadening of the carbon dioxide absorption band, the extent of which depends upon the foreign gases present. Adjustment of the instrument sensitivity during the setting-up procedure may be used to compensate for the pressure broadening, thereby eliminating the error.
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