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Magnetic flow sensor

  • US 6,085,599 A
  • Filed: 10/05/1998
  • Issued: 07/11/2000
  • Est. Priority Date: 04/26/1995
  • Status: Expired due to Term
First Claim
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1. A flow sensor for measuring a rate of flow of a fluid, the sensor comprising:

  • at least one electrically insulated flow passage;

    at least a pair of permanent magnets located outside of the flow passage and orthogonal to a direction of the fluid flow and providing magnetic flux orthogonally through the flow passage and the fluid flow;

    a drive for mechanically repositioning the magnet to alternate the magnetic flux polarity to produce an alternating voltage having a magnitude proportional to the flow rate of the fluid;

    at least two electrically conducting electrodes spaced apart from one another on opposite sides of the flow passage and generally orthogonally to a direction of flow of said fluid, for contacting the fluid and sensing the alternating voltage, said electrodes being located substantially outside the path of magnetic flux generated by said pair of magnets to thereby minimize the generation of voltages at said electrodes, and said electrodes further being symmetrically located with respect to said magnetic flux from said magnets to detect, due to alternation of said magnetic flux through said flow passage, equal voltages of opposite polarity which cancel one another.

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