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CALIBRATION DEVICE FOR A GAS ANALYZER

  • US 3,825,756 A
  • Filed: 05/03/1973
  • Issued: 07/23/1974
  • Est. Priority Date: 05/03/1973
  • Status: Expired due to Term
First Claim
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1. A calibration device for a gas analyzer comprising a. a sample cell containing a sample of the gases to be analyzed, b. an infrared detector, c. a source of radiation directed through said sample cell and onto said infrared detector, d. means for selectively applying radiation passed from said source through said sample cell onto said infrared detector for at least two absorption regions for gases to be measured and at least one reference region whereby signals are generated by said detector in accordance with the amount of radiation applied thereto in said regions, e. circuit means for processing said signals to measure the amounts of at least two gas constituents in said sample cell, and f. a single calibration element for insertion between said source and said infrared detector having anti-reflection coatings on each side thereof for attenuating radiation in at least two absorption regions while transmitting radiation in said reference region.

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