Particle sensor plug with wireless casing connection

Details Particle sensor plug with wireless casing connection Particle sensor plug with wireless casing connection

1990-05-17

1991-06-25

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Fluid material examination

340631, G01N 2774, G01R 3312

Patent

active

050270656

ABSTRACT:
A particle sensor having a magnet for attracting and retaining metallic particles in a lubricating fluid is disclosed having a sensor to determine when the particles attracted and retained on the magnet have reached a predetermined level and to transmit this information to a machine operator. The sensor, which includes a plug removably attached to the machine casing, has a magnet which extends into the path of the lubricating fluid to attract and retain metallic particles. A pair of coils, one attached to the moveable plug and one attached to the casing adjacent to the plug are inductively coupled such that the accumulation of particles on the magnet changes the inductance of the coils. An electronic circuit converts the changes in inductance to voltage changes to activate an alarm or other signal to the operator when the threshold value has been reached.

REFERENCES:
patent: 2671200 (1954-03-01), Lederer
patent: 3404337 (1968-10-01), Pool et al.
patent: 4339714 (1982-07-01), Ellis

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