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Apparatus for metering liquid flow

  • US 4,433,577 A
  • Filed: 06/04/1981
  • Issued: 02/28/1984
  • Est. Priority Date: 06/04/1981
  • Status: Expired due to Fees
First Claim
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1. For use with a source of liquid, apparatus for measuring the flow of the liquid comprising an inlet tube connected to the source;

  • a container, said container comprising an inlet port operably connected to said inlet tube such that liquid is supplied to said container;

    an orifice situated to permit liquid to drain from said container;

    an outlet tube operably connected to said orifice;

    means operably connecting said container, at a point above the liquid therein, and said outlet tube, for equalizing the pressure therebetween; and

    means for sensing the level of liquid in said container and for generating a signal representative of the instantaneous rate of liquid flow through said container in accordance with said sensed level, said signal generating means comprising means for detecting the location of the surface of the liquid in said container and means for generating an analog signal representative of the detected location, said analog signal generating means comprising a voltage source, an output and a plurality of individually actuatable, parallelly situated switch means, each of said switch means having an output circuit operably connected between said voltage source and said output, and a control input, each of said switch means being effective, when said control input is actuated by said detecting means, to connect said voltage source to said output, said detecting means comprising a plurality of sensors, each of said sensors having an output operably connected to said control input of a different one of said switch means and effective to actuate same when said sensor is actuated, wherein each of said sensors comprises an electrode extending through the wall of said container and further comprising means for grounding the liquid in said container.

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