Liquid level detecting apparatus

Details Liquid level detecting apparatus Liquid level detecting apparatus

1977-02-23

1979-01-16

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

73295, 340 59, G08B 2100

Patent

active

041351860

ABSTRACT:
A liquid level detecting apparatus comprises a thermistor adapted to generate heat by current flowing therethrough, wherein the liquid level is sensed by detecting a current value at the thermistor which varies in dependence on a variation in temperature of the thermistor, which temperature in turn varies in dependence on whether the thermistor is immersed in the liquid or exposed to air. A relay coil is provided in series to the thermistor and disposed within a casing together with the latter so that the variation in temperature of the liquid may be transmitted to the relay coil, wherein the variation in the current value at the thermistor caused by the temperature variation of liquid is corrected by the variation of the resistance of the relay coil.

REFERENCES:
patent: 3407840 (1968-10-01), Finnegan
patent: 3500367 (1970-03-01), Fremont et al.
patent: 3600946 (1971-08-01), Ziemba et al.
patent: 3878541 (1975-04-01), Dodson

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