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Sensor for combustible gases

  • US 5,549,871 A
  • Filed: 10/13/1995
  • Issued: 08/27/1996
  • Est. Priority Date: 01/21/1993
  • Status: Expired due to Term
First Claim
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1. A sensor for a combustible gas comprising:

  • a temperature sensitive element having a catalyst associated therewith to facilitate combustion of the combustible gas;

    a shroud surrounding the temperature sensitive element and extending above a top surface of the temperature sensitive element;

    a reaction vessel surrounding the shroud and forming a passageway there between for creating a flow of gas separated from the temperature sensitive element by the shroud and having a shaped downstream end for directing the flow inwardly starting at a point above the temperature sensitive element so that the flow of gas does not directly contact the temperature sensitive element, but reaches the temperature sensitive element substantially solely by diffusion; and

    a heater coupled to the reaction vessel.

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