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Liquid level measuring apparatus

  • US 5,347,864 A
  • Filed: 04/12/1993
  • Issued: 09/20/1994
  • Est. Priority Date: 04/12/1993
  • Status: Expired due to Fees
First Claim
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1. In a liquid level measuring apparatus having a plurality of spaced reed switches vertically aligned for positioning in a liquid, each reed switch vertically overlapping the adjacent above and below reed switches, the longitudinal axis of said reed switches being at an angle to the vertical axis of the apparatus and a float carrying magnetic means movably positioned adjacent said plurality of switches, said magnetic means having a magnetic field for sequentially actuating switches as the float moves relative to the switches, the improvement comprising,a microprocessor attached to the liquid level measuring apparatus,said switches electrically connected together in parallel in a plurality of sets,a plurality of shift registers, each register connected to one of the sets of switches, said registers connected together and to the microprocessor for supplying a parallel to serial conversion of the open or closed status of each switch, andsaid microprocessor providing an output signal indicating the vertical position of the float relative to said switches.

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