Apparatus for detecting metallic debris in dielectric fluid having an indirectly heated thermistor for balancing a bridge network
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United States of America Patent
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Oct 15, 1996
Grant Date -
N/A
app pub date -
Nov 10, 1994
filing date -
Nov 10, 1994
priority date (Note) -
Expired
status (Latency Note)
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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.
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