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Solid state pH sensor

  • US 5,271,820 A
  • Filed: 06/19/1992
  • Issued: 12/21/1993
  • Est. Priority Date: 06/19/1992
  • Status: Expired due to Fees
First Claim
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1. A solid state pH sensor for pH sensing equipment, said pH sensor comprising:

  • an indicator electrode, said indicator electrode comprising a first inert electrical conductor imbedded in a first electrically non-conductive substrate, said first inert electrical conductor having a first exposed portion,a metal/metal oxide coating on said first exposed portion, such that said metal/metal oxide coating entirely covers said first exposed portion, anda contact zone electrically connected to said first inert electrical conductor, wherein said contact zone is utilized in making electrical contact between said first inert electrical conductor and said pH sensing equipment, anda reference electrode, said reference electrode comprising a second inert electrical conductor imbedded in a second electrically non-conductive substrate, said second inert electrical conductor having a second exposed portion, a metal/metal salt coating on said second exposed portion, such that said metal/metal salt coating entirely covers said second exposed portion, and a contact zone electrically connected to said second inert electrical conductor, wherein said contact zone is utilized in making electrical contact between said second inert electrical conductor and said pH sensing equipment;

    wherein said indicator and reference electrodes are electrically insulated from each other; and

    wherein said reference electrode is in contact with a reference electrolyte source.

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