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Pressure sensor

  • US 4,176,557 A
  • Filed: 04/24/1978
  • Issued: 12/04/1979
  • Est. Priority Date: 06/07/1976
  • Status: Expired due to Term
First Claim
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1. A pressure transducer comprising:

  • a hollow metal can including a closed end and an open end and a closed end, an aperture in said closed end for receiving fluid pressure;

    a first insulator closing said open end of said hollow metal can, said first insulator including a shoulder, and a first groove therein;

    a first heater in said first groove;

    a second insulator adjacent said closed end of said metal can, said second insulator including a second groove therein;

    a second heater in said second groove;

    a third insulator within said metal can between said first and second insulators sealing the interior of said can to provide first and second chambers;

    a pressure transducer mounted on said third insulator in said first chamber in communication with said aperture, said transducer responsive to pressure to provide a corresponding electrical value;

    an electronic sensing circuit mounted on said third insulator within said second chamber and electrically connected to said pressure transducer to provide an electrical signal corresponding to said electrical value; and

    a heater circuit mounted on said shoulder of said first insulator, said heater circuit connected to said first and second heaters and operable to maintain the temperature within said housing at a predetermined level.

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