G - Physics – 01 – F
Patent
G - Physics
01
F
73/69
G01F 23/26 (2006.01) F01M 11/12 (2006.01)
Patent
CA 1317785
68297-907 Abstract of the Disclosure Digital Oil Level Sensor An oil level sensor includes a sensor body adapted to be mounted to the block or casing of an oil-containing reservoir. A probe including a pair of electrodes forming a capacitor extends from the sensor body so that the capacitor will be at least partially immersed in the oil to detect the level thereof. At least one of the electrodes is insulated so that the apparent capacitance of the capacitor is relatively insensitive to any change in the conductivity of the oil at high temperatures. Circuitry is provided in response to the capacitance of the capacitor for signalling the level of the oil, which capacitance is a function of the oil level. The sensor body is mounted to the block by external threads on the probe. The electrodes of the probe extend proximally past the threads to provide an increased capacitance for the sensor. The electrodes of the probe are concentric and the inner electrode is supported at both ends to reduce fatigue. Circuitry is also provided for automatically testing the proper operation of the sensor .
553330
Atherton Kim Wesley
Barr A. Brinkley
Clow Charles R.
Harmon Thomas M.
Mawet Patrick H.
Caterpillar Inc.
Smart & Biggar
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