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Measuring apparatus for detecting gases

  • US 5,092,980 A
  • Filed: 02/22/1991
  • Issued: 03/03/1992
  • Est. Priority Date: 02/23/1990
  • Status: Expired due to Term
First Claim
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1. A measuring apparatus for detecting a gas present in the ambient, the measuring apparatus comprising:

  • an electrochemical sensor unit including;

    an electrolyte chamber for accommodating an electrolyte therein;

    measuring electrode means disposed in said electrolyte chamber for providing a measurement signal;

    a diffusion membrane separating said electrolyte chamber from the ambient;

    a diffusion barrier assembly interposed between said diffusion membrane and the ambient;

    said diffusion barrier assembly including pass-through opening means having a cross section for allowing the gas to pass therethrough to said diffusion membrane;

    valve means for adjusting said cross section in size so as to permit more or less amounts of the gas to pass to said diffusion membrane; and

    ,comparator means for comparing said measurement signal with a limit value and for driving said valve means whereby said cross section of said opening is changed in dependence upon the comparison to said limit value.

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