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Method and apparatus for sensor calibration in a dewatering system

  • US 8,109,126 B1
  • Filed: 10/06/2008
  • Issued: 02/07/2012
  • Est. Priority Date: 10/06/2008
  • Status: Active Grant
First Claim
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1. A selective calibrating sensor circuit comprising:

  • an electronic sensor configured to provide a sensor reading based on a characteristic of substances in proximity to the electronic sensor;

    a self-calibrating sensing circuit configured to receive the sensor reading from the electronic sensor and to generate a water detection signal to indicate whether the electronic sensor is immersed in water based on the sensor reading, wherein the self-calibrating sensing circuit adjusts one or more internal parameters during calibration to null an effect on the sensor reading due to contaminants or non-water substance in contact with the electronic sensor; and

    a sensor controller configured to receive the water detection signal, to generate a control output signal based on the water detection signal, to prohibit calibration by the self-calibrating sensing circuit when the water detection signal indicates that the electronic sensor is immersed in water, and to selectively enable calibration by the self-calibrating sensing circuit when the water detection signal does not indicate that the electronic sensor is immersed in water.

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