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Liquid level and temperature sensing device

  • US 5,189,911 A
  • Filed: 01/10/1992
  • Issued: 03/02/1993
  • Est. Priority Date: 01/10/1992
  • Status: Expired due to Fees
First Claim
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1. A liquid level sensing device for monitoring and measuring the level of liquid stored within a tank or reservoir comprising an upper control canister to house control circuitry to generate and transmit digital level interrogation pulses, a lower sensing probe including an outer tube to operatively house a solid inner conductor coupled to said control circuitry to receive said digital level interrogation pulses and a first level sensing means movable disposed relative to said outer tube to interact with the electromagnetic field generated in said solid inner conductor by said digital level interrogation pulses to generate a corresponding series of sonic pulses and a transducer disposed in operative relationship relative to said solid inner conductor including means to sense said series of sonic pulses and generate a corresponding series of electrical signals, said control circuitry coupled to said transducer to receive said corresponding series of electrical signals and including means to measure the time lapse between said digital level interrogation pulses and said corresponding electrical signals to indicate the relative position of said first level sensing means relative to the longitudinal axis of said inner conductor corresponding to the level of an upper liquid within the tank or reservoir and means to generate a liquid level output signal corresponding to the level of the upper liquid for transmission to a display monitor and a second level sensing means disposed beneath said first level sensing means, said second level sensing means movable disposed relative to said outer tube to interact with the electromagnetic field generated in said solid inner conductor by said digital level interrogation pulses to generate a corresponding second series of sonic pulses and said transducer is disposed in operative relationship relative to said solid inner conductor including means to sense said second series of sonic pulses and generate a corresponding second series of electrical signals, said control circuitry coupled to said transducer to receive said corresponding second series of electrical signals and including means to measure the time lapse between said digital level interrogation pulses and said corresponding second series of electrical signals to indicate the relative position of said second level sensing means relative to the longitudinal axis of said inner conductor corresponding to the level of a lower liquid within the tank or reservoir and means to generate a second liquid level output signal corresponding to the level of a lower liquid for transmission to the display monitor.

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