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Method and apparatus for monitoring fluid flow

  • US 4,797,666 A
  • Filed: 09/16/1986
  • Issued: 01/10/1989
  • Est. Priority Date: 09/16/1986
  • Status: Expired due to Fees
First Claim
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1. In a fluid supply system, apparatus for monitoring fluid flow to determine whether either an abnormal flow condition or a catastrophic flow condition exists in such supply system, said apparatus comprising:

  • means for measuring a parameter of fluid flow in said supply system, and producing a first signal corresponding to such parameter;

    first timer means, responsive to said first signal to be reset thereby, for producing a signal upon expiration of a preselected time period;

    second timer means, responsive to said signal produced by said first timer means to be reset thereby, for producing an output signal upon expiration of a preselected time period substantially greater in duration than the preselected time period of said first timer means, whereby upon production of such output signal an abnormal flow condition is determined to exist;

    means, responsive to said first signal for comparing an accumulated running total of said first signal to a second signal representative of a preselected fluid flow parameter, and producing an output signal when said accumulated running total of said first signal exceeds said second signal, whereby upon production of such output signal a catastrophic flow condition is determined to exist; and

    means responsive to said output signal of said second timer means or of said comparing means, for producing a control signal for said supply system.

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