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System for monitoring and controlling the level of a liquid in a closed container

  • US 6,095,178 A
  • Filed: 09/15/1997
  • Issued: 08/01/2000
  • Est. Priority Date: 09/15/1997
  • Status: Expired due to Fees
First Claim
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1. A system for monitoring and controlling the level of a liquid in a closed container in which a gas is bubbled up through the liquid, the system comprising:

  • a block for mounting at an upper end of the container;

    a lower level electrode for extending from said block vertically into the container;

    an upper level electrode for extending from said block vertically into the container and shorter than said lower level electrode;

    a valve for venting the gas from the container;

    a motor for driving said valve;

    first means responsive to liquid in the container rising to a free end of said upper level electrode to activate said motor to close said valve to permit increase of gas pressure in the container to force lowering of the level of the liquid;

    second means responsive to the liquid in the container dropping below a free end of said lower level electrode to activate said motor to open said valve to vent the container and reduce gas pressure therein to permit rising of the level of the liquid.

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