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Stationary coils for a coriolis effect mass flowmeter

  • US 5,349,872 A
  • Filed: 08/20/1993
  • Issued: 09/27/1994
  • Est. Priority Date: 08/20/1993
  • Status: Expired due to Term
First Claim
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1. In a Coriolis flowmeter having first and second flow tubes positioned substantially parallel to each other;

  • means for vibrating said first and second flow tubes out of phase with respect to each other;

    sensor means for detecting the movement of said flow tubes resulting from material flow through said vibrating flow tubes;

    said sensor means comprising;

    at least two magnets each of which is affixed to a corresponding portion of different ones of said flow tubes;

    a coil proximate said magnets and having a substantially flat surface aligned substantially parallel to a plane defined by a surface of both of said magnets;

    means for maintaining said coil in a substantially non-movable fixed position as said magnets vibrate out of phase with respect to each other;

    said coil being responsive to the vibration of said magnets affixed to said vibrating flow tubes for generating a signal representing the relative movement of said vibrating flow tubes, said movement including the movement due to Coriolis forces generated by material flow within said flow vibrating flow tubes.

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