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Gas sensor

  • US 4,694,834 A
  • Filed: 03/31/1986
  • Issued: 09/22/1987
  • Est. Priority Date: 03/31/1986
  • Status: Expired due to Fees
First Claim
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1. A gas sensor comprising:

  • a pH-sensitive FET transducer having a gate-insulated field-effect transistor structure;

    a reference electrode;

    an insulating tube having an opening which provides connecting lead wires to the FET transducer and which houses said transducer, said gate region of said FET transducer being located in the opening provided in said insulating tube, and said lead wires extending along said insulating tube;

    electrical insulation resin placed between the inner wall of said tube and lead-wire-FET connecting points to stop said opening of the tube; and

    a gas permeable membrane overlying and in direct contact with the gate region of the FET transducer whereby the existence of any discernible layer between the gas permeable membrane and the FET transducer is precluded.

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