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Particle sensor plug with wireless casing connection

  • US 5,027,065 A
  • Filed: 05/17/1990
  • Issued: 06/25/1991
  • Est. Priority Date: 05/18/1989
  • Status: Expired due to Term
First Claim
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1. A particle sensor for sensing the presence of metallic particles in a lubricating fluid circulating through a machine casing comprising:

  • (a) a plug removably attached to the machine casing;

    (b) a magnet attached to the plug and located so as to extend into the lubricating fluid such that metallic particles in the lubricating fluid are attracted to the magnet;

    (c) a first coil located on and electrically insulated from the plug;

    (d) a second coil located on the casing adjacent to the first coil so as to be inductively coupled therewith;

    (e) variable resistance means located on the plug and electrically connected to the first coil such that an accumulation of metallic particles on the magnet changes the resistance of the variable resistance means thereby changing the inductance of the first and, consequently, the second coils as metallic particles build up on the magnet; and

    ,(f) electrical circuit means connected to the second coil to sense the varrying inductance of the second coil and generate an output signal.

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