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Apparatus for electrolytically determining a species in a fluid and method of use

  • US 4,076,596 A
  • Filed: 10/07/1976
  • Issued: 02/28/1978
  • Est. Priority Date: 10/07/1976
  • Status: Expired due to Term
First Claim
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1. In an electrode assembly for measuring the concentration of oxygen in a fluid of the type which includes in combination:

  • an electrolytic medium;

    first electrode means having surfaces in contact with said medium;

    barrier means for separating said medium from said fluid, and being selectively permeable to said oxygen, and in contact with said medium;

    an electrical power source connected for biasing said first electrode means at a potential at which said oxygen in said medium will be consumed at said surfaces of said first electrode means; and

    second electrode means having surfaces in contact with said medium and connected to said power source for completing a circuit in which a current from said source can flow through both said electrode means at a level which is a function of such consumption;

    said second electrode means and said medium being such that with the combination substantially only said oxygen is electrolytically generable at said second electrode means at said current level, said second electrode means being biased by said power source at a potential at which said oxygen is generable from said medium;

    the improvement comprising,the positioning of said second electrode means with respect to said first electrode means so that said surfaces of said first electrode means are interleaved in side by side relationship with said surfaces of said second electrode means with said surfaces of said electrodes equidistant from said barrier means and the periodicity of said positioning sufficiently small with respect to the thickness and permeability of both said barrier means and said medium to oxygen so that the oxygen generated at said second electrode is consumed at said first electrode without any substantial transfer of oxygen across the interface between said barrier means and said fluids.

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