Apparatus for detecting metallic debris in dielectric fluid havi

Details Apparatus for detecting metallic debris in dielectric fluid havi Apparatus for detecting metallic debris in dielectric fluid havi

1994-11-10

1996-10-15

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Fluid material examination

324234, 324236, 324651, 340631, 323369, G01N 2774, G01N 3328, G01R 3312, H03H 100

Patent

active

055657680

ABSTRACT:
In an inductive debris monitor (IDM) an inductive probe is disposed at a fluid flow passageway to be monitored, and an RF bridge containing a variable resistance network is used to detect changes in the impedance of the probe due to the passage of metallic debris. An indirectly heated thermistor is utilized in the resistance network for balancing the bridge. Thus the operating temperature range is significantly extended without compromising reliability or experiencing degradation.

REFERENCES:
patent: 4173975 (1979-11-01), Delong et al.
patent: 4926120 (1990-05-01), Veronesi et al.
patent: 5041856 (1991-08-01), Veronesi et al.
patent: 5089781 (1992-02-01), Arichika et al.
patent: 5269170 (1993-12-01), Meyer

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