Device for detecting the level of a liquid in a receptacle

Details Device for detecting the level of a liquid in a receptacle Device for detecting the level of a liquid in a receptacle

1992-03-27

1992-12-29

Cuchlinski, Jr., William A.

Measuring and testing

Liquid level or depth gauge

Thermal type

73304R, 374142, 340622, G01F 2322

Patent

active

051741539

ABSTRACT:
The detecting device according to the present invention is provided with a case, a first and second detecting pads which juts from the case and which can be closely attached to the outer wall of the receptacle, supports which are connected to the first and second detecting pads in a thermal-conducting manner, a first thermistor and heater embedded in the support of the first detecting pad, a second thermistor embedded in the support of the second detecting pad, and a detector circuit which measures the quantity of heat transmitted from the first detecting pad into the receptacle in accordance with a change in the output of the first thermistor when the first detecting pad and the support thereof are heated by the heater to a preset temperature which is above the reference temperature of the second detecting pad and the support thereof, thus detecting the level of a liquid in the receptacle from the measured quantity of heat transmitted.

REFERENCES:
patent: 1833122 (1931-11-01), Harrison
patent: 3161050 (1964-12-01), Exner
patent: 3299706 (1967-01-01), Bailey et al.
patent: 4112759 (1978-09-01), Mizuno et al.
patent: 4774838 (1988-10-01), Rickson
patent: 4796471 (1989-01-01), Sabin
patent: 4912977 (1990-04-01), Hope
patent: 5092170 (1992-03-01), Honstret et al.

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