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Process for minimizing cross-talk in diagnostic signals of a pH sensor

  • US 6,429,660 B1
  • Filed: 12/27/2000
  • Issued: 08/06/2002
  • Est. Priority Date: 12/27/2000
  • Status: Expired due to Fees
First Claim
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1. A process of operating a pH analyzer to measure pH of a solution, comprising steps of:

  • a) providing a pH sensor having an ion-specific electrode and a reference electrode, the ion-specific electrode being in contact with the solution and designed to provide an electrical potential based on the pH of the solution, the reference electrode being designed to provide a reference electrical potential and being coupled to the ion-specific electrode through the solution;

    b) applying the pH sensor and a common electrode to the solution;

    c) measuring the pH of the solution during a first cycle of operation by c1) applying a first current, IGLASS, to the ion-specific electrode during a first time period, c2) applying a second current, IREF, to the reference electrode during a second time period that is mutually exclusive of the first time period, c3) measuring a voltage, VGLASS, between the ion-specific electrode and the common electrode, c4) measuring a voltage, VREF, between the reference electrode and the common electrode, c5) identifying the pH of the solution based on a difference between the measured voltages VGLASS and VREF.

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