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Electrolytic sensor for measuring the content of gas in a fluid

  • US 5,344,545 A
  • Filed: 01/07/1992
  • Issued: 09/06/1994
  • Est. Priority Date: 01/21/1991
  • Status: Expired due to Term
First Claim
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1. A sensor for measuring the content of a gas in a fluid using liquid or gel electrolyte, comprising:

  • a plurality of layers of impermeable material, said layers being mutually superimposed and fixed together to define a laminated structure;

    at least one of said layers having at least one first internal recess whereby a first electrolyte cavity is defined within the laminated structure, with a first reservoir region of said first cavity between opposed said layers of the structure;

    at least one other of the layers having at least one second internal recess formed by a groove that provides a second electrolyte cavity, said groove communicating with said first electrolyte cavity and having a reaction region within said second cavity that is smaller in volume than said first region and that communicates with the first region;

    a gas-permeable membrane extending across a window communicating between the reaction region of the electrolyte cavity and an exterior of the sensor;

    an electrolyte contained within said first and second cavities;

    a sensing electrode, said sensing electrode being incorporated in the laminated structure and having an exposed portion, said exposed portion being in the reaction region and a portion of the electrolyte being held between the gas permeable membrane and the exposed portion of the sensing electrode; and

    a further electrode exposed to the first reservoir region.

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