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Extended use planar sensors

  • US 5,387,329 A
  • Filed: 04/09/1993
  • Issued: 02/07/1995
  • Est. Priority Date: 04/09/1993
  • Status: Expired due to Term
First Claim
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1. A solid-state planar oxygen sensor comprising:

  • an electrically nonconductive substrate;

    a first electrically conductive material adhered to a first portion of said substrate, at least a portion of said first conductive material being covered with an electrically insulating dielectric coating and at least one portion of said first conductive material remaining uncovered by said electrically insulating dielectric coating, said uncovered portion of said first conductive material defining a working electrode area;

    a second electrically conductive material adhered to a portion of the substrate, a portion of said second conductive material being covered with the electrically insulating dielectric coating and at least one portion of said second conductive material remaining uncovered by said electrically insulating dielectric coating, said uncovered portion of said second conductive material defining a counter electrode area;

    a hygroscopic solid electrolyte provided on at least the working electrode area and the counter electrode area, said electrolyte having a swell value of less than two times its dry volume when provided with water;

    a semipermeable membrane covering said electrolyte having an oxygen permeability of less than 8 Barrers;

    a cover member covering said semipermeable membrane and having a recess formed therein, said recess having a perimeter facing the membrane and at least one passageway connected to the recess; and

    a gasket contacting the recess perimeter and the membrane to form a seal therebetween, the gasket, cover member, and membrane defining a sample chamber.

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