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Coriolis effect mass flowmeter

  • US 5,321,991 A
  • Filed: 05/25/1993
  • Issued: 06/21/1994
  • Est. Priority Date: 08/01/1991
  • Status: Expired due to Term
First Claim
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1. A method of determining information including the mass flow rate of material flowing through a pipe section which is an integral part of an existing pipe system that is devoid of material flow measurement means, said method comprising the steps of:

  • affixing a motion sensor to a first location comprising a zero flow node of a harmonic of the natural frequency of vibration of said pipe section;

    affixing a vibration driver to a second location of said pipe section;

    operating said driver to oscillate said pipe section at said harmonic frequency;

    said sensor and said driver being attached only to said pipe section and being free from attachment to a non-movable object; and

    determining the mass flow rate of said material flowing through said pipe section by measuring with said motion sensor the amplitude of transverse deflections of said first location of said pipe section in a direction perpendicular to the longitudinal axis of said pipe section;

    said transverse deflections of said pipe section being caused jointly by the oscillation of said pipe section and the Coriolis motion of said pipe section due to the flow of material through said pipe section.

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