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Method and apparatus for measuring dissolved gas concentrations

  • US 4,578,154 A
  • Filed: 06/19/1985
  • Issued: 03/25/1986
  • Est. Priority Date: 03/25/1983
  • Status: Expired due to Fees
First Claim
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1. An apparatus for measuring dissolved oxygen and hydrogen gas concentrations which comprises:

  • an electrode;

    a counter-electrode;

    a vessel filled with electrolyte into which the electrodes are immersed;

    an oxygen and hydrogen permeable membrane having a thickness in the range of 70 μ

    m to 350 μ

    m partitioning said electrolyte from sample water containing said dissolved gases outside of said vessel;

    at least one power source applying a potential in the range of -0.4 to -0.75 V and connecting said electrode and said counter electrode;

    means measuring current generated between said electrode and said counter electrode; and

    wherein the thickness of the membrane determines a potential region for a reduction limiting current plateau and a potential region for an oxidation limiting current plateau between two dissolved gas components to be measured, the combination of both of said regions producing an overlapped potential region.

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