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Method of checking the function of a sensor

  • US 7,691,254 B2
  • Filed: 03/20/2006
  • Issued: 04/06/2010
  • Est. Priority Date: 04/01/2005
  • Status: Expired due to Fees
First Claim
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1. A method of checking the function of an amperometric electrochemical sensor which comprises an electrochemical cell, comprising the steps of:

  • a. applying a constant polarization voltage to the electrochemical cell, the first application of the constant polarization voltage being a constant initial polarization voltage;

    b. applying a perturbation quantity to the electrochemical cell;

    c. determining at least one response of the electrochemical cell in the presence of the perturbation;

    d. determining a check value by using the at least one electrochemical cell response;

    e. comparing the check value to a limit value to determine a variance such that when the variance is positive, the constant polarization voltage is changed by a predetermined increment and steps a. through e. are repeated with the changed polarization voltage; and

    when the variance is zero or negative, the polarization voltage is determined to be an optimal polarization voltage.

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