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Method for determining exhaustion of an electrochemical gas sensor

  • US 6,096,186 A
  • Filed: 08/18/1998
  • Issued: 08/01/2000
  • Est. Priority Date: 08/18/1998
  • Status: Expired due to Term
First Claim
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1. A method for testing an amperometric electrochemical sensor operated in a galvanic mode and comprising at least one consumable electrode, and which measures a gas which comprises a component of a fluid, said sensor producing a steady state electrical output across a load resistor which is substantially proportional to concentration of the gas in the fluid, said method comprising the steps of:

  • determining an initial steady state output;

    changing the value of the load resistor;

    observing the change in the steady state output after said changing the value of said load resistor; and

    using said change in steady state output to determine whether the sensor is near the end of its useful life.

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