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Oxygen sensor with heater

  • US 4,578,174 A
  • Filed: 04/27/1984
  • Issued: 03/25/1986
  • Est. Priority Date: 05/09/1983
  • Status: Expired due to Term
First Claim
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1. An oxygen sensor comprising:

  • a tubular solid electrolyte body having an elongate bore therein, a first end of said elongate bore is closed by one end of said tubular solid electrolyte body and a second end of said elongate bore is open at a second end of said tubular solid electrolyte body, said tubular body having reference and measuring electrodes on inner and outer surfaces thereof, respectively;

    a housing body which supports said tubular solid electrolyte body such that said outer surface of said tubular body is exposed at said one end of said tubular body to an exhaust gas, said housing body maintaining said elongate bore in a gas-tight condition with respect to said exhaust gas and said one end of said tubular body extends outwardly from said housing body; and

    a bar-shaped heater inserted in said elongate bore of said tubular solid electrolyte body, and comprising a resistance heating portion having a positive temperature coefficient of resistance of not less than 0.3%/°

    C.,and a ceramic body carrying said resistance heating portion, the resistance heating portion being located only in said one end of the tubular body which extends outwardly from the housing body and not extending past said housing body.

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