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Method and apparatus for capacitive sensing the top level of a material in a vessel

  • US 8,418,550 B2
  • Filed: 12/22/2009
  • Issued: 04/16/2013
  • Est. Priority Date: 12/23/2008
  • Status: Active Grant
First Claim
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1. A method of controlling a level of a material in a vessel, the method comprising the steps of:

  • placing at least two capacitive sensors proximate to the material in the vessel, a first capacitive sensor arranged to monitor a first range of levels in the vessel and a second capacitive sensor arranged to monitor at least a first level in the vessel, the first level being a part of the first range of levels;

    monitoring an output of the first capacitive sensor;

    monitoring an output of the second capacitive sensor; and

    determining a current level of the material in the vessel based on the output of the first capacitive sensor and the output of the second capacitive sensor, the output of the second capacitive sensor being used to improve an accuracy of the determined current level.

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