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Monitoring and compensating for temperature-related error in an electrochemical sensor

  • US 8,000,918 B2
  • Filed: 09/05/2008
  • Issued: 08/16/2011
  • Est. Priority Date: 10/23/2007
  • Status: Expired due to Fees
First Claim
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1. A method of compensating for temperature-related errors in an electrochemical sensor that outputs a current proportional to an analyte concentration when a voltage is applied to the sensor, the method comprising:

  • measuring current output from the sensor;

    lowering sensor voltage to a first voltage level below a reaction-sustaining threshold;

    measuring a first offset current corresponding to the first voltage level;

    adjusting sensor voltage to a second voltage level below the reaction-sustaining threshold, wherein said second voltage level is different from said first voltage level;

    measuring a second offset current corresponding to the second voltage level;

    calculating a difference between the first and second offset currents;

    deriving a temperature compensation value based in part on the difference; and

    adding the temperature compensation value to the measured current output to obtain an analyte concentration corrected for temperature.

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