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Nondispersive infrared gas analyzer

  • US 4,468,561 A
  • Filed: 01/24/1983
  • Issued: 08/28/1984
  • Est. Priority Date: 12/27/1979
  • Status: Expired due to Fees
First Claim
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1. An infrared gas analyzer for measuring at least one component gas of a sample gas mixture, the infrared gas analyzer being of the type having a measuring ray path and a reference ray path along which an infrared measuring ray and an infrared reference ray are respectively propagated, the infrared measuring and reference rays each being periodically interrupted;

  • a measuring cell through which the sample gas mixture flows and the infrared measuring and reference rays are propagated;

    a selectivity cell containing the component gas which is desired to be measured in the reference ray path;

    a compensation cell for holding a gas in the measuring ray path; and

    a selective detector for producing a signal corresponding to a difference between the attenuation of the infrared measuring ray after it propagates along the measuring ray path, and the infrared reference ray after it propagates along the reference ray path;

    the infrared gas analyzer further comprising an inlet and an outlet on the compensation cell for permitting a continuous flow of the sample gas mixture through the compensation cell such that the infrared measuring ray, after being propagated through the measuring cell, is attenuated by interfering component gases in the compensation cell, said interfering component gases being present in the compensation cell in proportional concentrations which vary directly with the proportional concentrations of interfering component gases in the measuring cell.

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