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Flow volume detection device

  • US 4,674,338 A
  • Filed: 12/31/1984
  • Issued: 06/23/1987
  • Est. Priority Date: 12/31/1984
  • Status: Expired due to Term
First Claim
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1. An apparatus for monitoring the flow volume in a conduit, comprising:

  • means for converting the flow of a fluid in said conduit to rotary motion;

    a rotatable, visual indicator comprised of a non-magnetically attractive material to which said rotary motion is imparted, said indicator including about the periphery thereof visually perceptible sequential values indicative of the rotary position of said indicator;

    a non-magnetized actuator comprised of a magneticallly attractive material, said actuator disposed about a small arc of said periphery of said indicator;

    a magnetic switch disposed near said indicator, said magnetic switch comprising a plurality of magnets disposed in a non-magnetically attractive housing and including a movable magnet, said switch magnetically biased to a first position by the magnetic interaction forces of said movable magnet with the other magnets in said plurality, said magnetic switch temporarily actuated from said first to a second position by the proximity of said non-magnetized actuator once during each revolution of said indicator when said forces are exceeded by the attractive force of said movable magnet for said actuator; and

    an electrical switch mechanically linked to said movable magnet for producing an output indicative of said flow, said electrical switch actuated by actuation of said magnetic switch.

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