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Liquid gaging system contamination monitor

  • US 4,363,239 A
  • Filed: 05/14/1980
  • Issued: 12/14/1982
  • Est. Priority Date: 05/14/1980
  • Status: Expired due to Term
First Claim
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1. In a liquid gaging system, an apparatus for monitoring a quadrature signal from a capacitive sensor, comprising:

  • a capacitive sensor for providing a liquid measurement signal related to a liquid in a tank, the liquid measurement signal comprising a capacitive signal and a quadrature signal; and

    means for monitoring the quadrature signal through null detection of the capacitive signal, the null detection being implemented through a successive approximation sequence, the means for monitoring being connected to the sensor.

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