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Solid state pH sensor

  • US 5,110,441 A
  • Filed: 12/14/1989
  • Issued: 05/05/1992
  • Est. Priority Date: 12/14/1989
  • Status: Expired due to Term
First Claim
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1. A solid state pH sensor for pH sensing equipment, said pH sensor comprising:

  • (a) an indicator electrode, said indicator electrode comprising(1) a first electrically conductive conductor imbedded in a first electrically non-conductive substrate, said first electrically conductive conductor having a first electrically conductive conductor exposed portion,(2) a metal/metal oxide coating on said first electrically conductive conductor exposed portion, such that said metal/metal oxide coating entirely covers said first electrically conductive conductor exposed portion,(3) a first annealed perfluorocarbon copolymer coating on said metal/metal oxide coating, such that said first annealed perfluorocarbon copolymer coating entirely covers said metal/metal oxide coating, and(4) an indicator contact zone electrically connected to said first electrically conductive conductor, wherein said indicator contact zone is utilized in making electrical contact between said first electrically conductive conductor and said pH sensing equipment; and

    (b) a reference electrode, said reference electrode comprising(1) a second electrically conductive conductor imbedded in a second electrically non-conductive substrate, said second electrically conductive conductor having a second electrically conductive conductor exposed portion,(2) a metal/metal salt coating on said second electrically conductive conductor exposed portion, such that said metal/metal salt coating entirely covers said second electrically conductive conductor exposed portion,(3) an immobilized electrolyte coating on said metal/metal salt coating, such that said immobilized electrolyte coating entirely covers said metal/metal salt coating,(4) a second annealed perfluorocarbon copolymer coating on said immobilized electrolyte coating, such that said second annealed perfluorocarbon copolymer coating entirely covers said immobilized electrolyte coating, and(5) a reference contact zone electrically connected to said second electrically conductive conductor, wherein said reference contact zone is utilized in making electrical contact between said second electrically conductive conductor and said pH sensing equipment;

    (c) wherein said indicator and reference electrodes are electrically insulated from each other.

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