Liquid sensor having thermistors

Details Liquid sensor having thermistors Liquid sensor having thermistors

G - Physics

01

F

G01F 23/24 (2006.01)

Patent

CA 2104424

A sensor for detecting whether liquid is present at a location in a tank, comprises a probe placed at the location, containing a negative temperature coefficient resistor (NTC) and a positive temperature coefficient resistor (PTC) mutually connected in series relation. The positive temperature coefficient resistor exhibits a progressive resistance variation responsive to temperature change. An electrical power source delivers a constant electric current to the probe. The detector further com- prises a comparator for comparing the total resistance of the serially mounted resistors with a threshold.

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