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Hall-cell liquid level detector

  • US 4,361,835 A
  • Filed: 03/16/1981
  • Issued: 11/30/1982
  • Est. Priority Date: 03/16/1981
  • Status: Expired due to Fees
First Claim
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1. A liquid level detector comprising:

  • a column of Hall-cells adapted to be mounted vertically in a tank containing a liquid;

    a magnet being adapted to move vertically at a substantially fixed spacing from said column of Hall-cells;

    a float means for maintaining said magnet at the surface of said liquid to increase the magnetic field at the Hall-cell adjacent to said magnet, and an electronic means for sequentially applying DC power to each of said Hall-cells in said column, and for sensing, shaping and summing the outputs of all said Hall-cells, whereby the time period, between said applying DC power to a particular predetermined one of said Hall-cells and the occurrence in said summed outputs of a Hall-cell output signal that is characteristic of a Hall-cell in the field of said adjacent magnet, provides a unique indication of said liquid level.

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