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Method of and an apparatus for measuring ion concentrations in solutions

  • US 4,490,678 A
  • Filed: 05/13/1982
  • Issued: 12/25/1984
  • Est. Priority Date: 05/15/1981
  • Status: Expired due to Fees
First Claim
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1. A method of measuring ion concentrations in solutions, comprising:

  • using at least two-ion sensitive test electrodes, these having different sensitivities to at least one of the concentration and activity only in relation to the ion or ion mixture to be measured, using at least one common reference electrode which merely sets at least one operating point of the test electrodes, evaluating the output signals of the test electrodes by producing a measurement signal which represents the difference between the output signals and which is essentially independent of the properties of at least one of the reference and test electrodes which are disruptive to measurement; and

    dipping at least the two test electrodes directly into the solution which is to be measured.

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