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Wireless swimming pool water level system

  • US 20040118203A1
  • Filed: 03/21/2003
  • Published: 06/24/2004
  • Est. Priority Date: 02/23/2001
  • Status: Active Grant
First Claim
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1. A capacitive sensor for determining liquid level, comprising:

  • a surface adjacent which the liquid is present, and on which the fluid defines a level;

    a reference electrode at a lower part of the surface;

    a first sensor electrode arranged above the reference electrode at the surface; and

    a second sensor electrode arranged at least in part above the first sensor electrode and at the surface;

    wherein each of the first and second sensor electrodes has a greater area at the surface than does the reference electrode.

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