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Electromagnetic flow meter

  • US 5,578,763 A
  • Filed: 06/22/1995
  • Issued: 11/26/1996
  • Est. Priority Date: 06/22/1995
  • Status: Expired due to Fees
First Claim
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1. A flow meter comprising a conduit adapted to conduct a flow of a fluid, a stop in the conduit, a body movably received in the conduit, normally kept in engagement with the stop by the fluid flow, and including at least a portion of a magnetically responsive material, an electromagnet located outside the conduit in a position upstream from the stop relative to the direction of the fluid flow and having poles at a location such as to impose a magnetic force on the magnetically responsive material of the body when it is energized, means for energizing the electromagnet so as to progressively increase the magnetic force that it produces until the magnetic force is sufficient to move the body against the fluid flow and attract the body to a position between the poles, means for detecting changes in the magnetic flux field of the electromagnet when the body moves away from the stop and toward the electromagnet and producing a sensing signal indicative thereof, and means responsive to the sensing signal for detecting the magnitude of the current supplied to the electromagnet and producing a measurement signal indicative thereof.

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