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Solid state fluid level sensor

  • US 8,291,761 B2
  • Filed: 12/13/2007
  • Issued: 10/23/2012
  • Est. Priority Date: 07/09/2004
  • Status: Active Grant
First Claim
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1. A method of manufacturing a solid state fluid level sensor for activating a pump, comprising the steps of:

  • disposing a first electrode and a second electrode on a dielectric substrate;

    disposing a current switching device and a first differential sensing circuit on the dielectric substrate;

    electrically coupling the first and second electrodes to the current switching device and the differential sensing circuit to form a printed wiring board assembly, the first and second electrodes being configured to apply common mode signals to inputs of the first differential sensing circuit;

    providing a housing that forms a fluid-proof cavity that is adapted to be submerged in a fluid whose level is to be detected;

    disposing the printed wiring board assembly in the housing; and

    sealing the printed wiring board assembly within the housing.

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