Calibration of Infra-red CO2 Gas Analyzers

Abstract

Precision gas mixing pumps produce CO₂ gas mixtures for the calibration of infra-red CO₂ gas analyzers equivalent in accuracy to the standard CO₂ gas mixtures (± 1%) supplied by the National Bureau of Standards, Washington, D. C. The calibration of infra-red gas analyzers by the pressure difference method and by concentration differences did not agree. A factor of 0.709 was necessary to correct the pressure difference method for the effects of pressure broadening with our analyzer.