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Liquid level sensing method and device

  • US 5,275,951 A
  • Filed: 09/03/1992
  • Issued: 01/04/1994
  • Est. Priority Date: 06/13/1991
  • Status: Expired due to Fees
First Claim
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1. A method for sensing the level of a liquid in a container relative to a dispensing probe, said method comprising:

  • spacing the probe and a receiving antenna a fixed distance apart such that the container may be inserted into a space between the probe and the receiving antenna;

    inserting a container with fluid therein into the space;

    applying a radio frequency signal to the probe whereby it radiates a radio frequency signal that is sensed by the receiving antenna;

    moving the container relative to the probe;

    converting the signal sensed by the receiving antenna into a further signal representing the magnitude of the sensed signal; and

    ,analyzing the further signal to determine changes in the magnitude of the sensed signal as an indication of the level of the liquid in the container as the container is moved relative to the probe.

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