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Alcohol concentration sensor testing apparatus

  • US 5,205,151 A
  • Filed: 05/22/1991
  • Issued: 04/27/1993
  • Est. Priority Date: 05/22/1990
  • Status: Expired due to Term
First Claim
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1. An apparatus for testing an alcohol concentration sensor used in measuring an alcohol concentration of a fluid containing alcohol, the alcohol concentration sensor including a capacitive probe having a capacitance dependent upon the alcohol concentration of the fluid, and a circuit responsive to the capacitance of the capacitive probe for producing an output signal indicative of a sensed alcohol concentration, the apparatus comprising:

  • a plurality of capacitors having different capacitances each corresponding to a predetermined alcohol concentration;

    first means for connecting a selected one of the capacitors in parallel with the capacitive probe;

    second means for reading a value of the output signal when the selected capacitor is connected with the capacitive probe; and

    third means for comparing the read value with a value to be produced when the alcohol concentration sensor is exposed to an alcohol concentration predetermined for the selected capacitor to test the alcohol concentration sensor.

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