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FLUENT MATERIAL LEVEL CONTROL SYSTEM

  • US 3,602,251 A
  • Filed: 07/22/1969
  • Issued: 08/31/1971
  • Est. Priority Date: 07/22/1969
  • Status: Expired due to Term
First Claim
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1. Apparatus for controlling the level of a fluent material in a container, said apparatus comprising:

  • means for applying alternating electrical power to said apparatus;

    a variable impedance voltage divider network connected directly across said electrical power-applying means, said voltage divider network including;

    said container;

    the fluent material within said container;

    a plurality of electrodes located within said container at spaced levels; and

    at least one resistor;

    the electrical signal output of said voltage divider network being uniquely dependent upon the level of the fluent material in said container;

    a demodulator circuit connected to said voltage divider network to convert the alternating current output signals thereof to direct current signals;

    a threshold detector for generating first and second indicating signals responsive to the direct current output signals of said demodulator circuit, said first and second indicating signals being nonuniquely dependent upon the level of the fluent material in said container;

    means for producing control signals in response to said first and second indicating signals; and

    means responsive to said control signals for adjusting the level of the fluent material in said container;

    said control signal-producing means and said level-adjusting means being connected in series across said electrical power applying means.

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