Liquid sensor having thermistors

Details Liquid sensor having thermistors Liquid sensor having thermistors

1993-08-30

1995-06-06

Cuchlinski, Jr., William A.

Measuring and testing

Liquid level or depth gauge

Thermal type

374 54, 338 28, G01F 2324

Patent

active

054212022

ABSTRACT:
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 comprises a comparator for comparing the total resistance of the serially mounted resistors with a threshold.

REFERENCES:
patent: 3363466 (1968-01-01), Guidi
patent: 3559883 (1971-02-01), Buiting et al.
patent: 3863210 (1975-01-01), Roland
patent: 4276536 (1981-06-01), Wisnia
patent: 4619140 (1986-10-01), Kuhnel
patent: 4702619 (1987-10-01), Camp et al.
patent: 5111692 (1992-05-01), McQueen et al.

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