Apparatus for monitoring the level of liquid in a tank or reserv

Details Apparatus for monitoring the level of liquid in a tank or reserv Apparatus for monitoring the level of liquid in a tank or reserv

1982-09-27

1985-12-10

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Applications

Measuring or testing

377 20, 377 39, 377 49, 73295, 340620, G01F 2324

Patent

active

045584567

ABSTRACT:
Apparatus for monitoring the level of liquid in a tank or reservoir comprises a probe formed by a resistive metal element having a high temperature coefficient, and a supply means for the probe. The apparatus further comprises a voltage-frequency converter which is connected in parallel with the probe, two counters which are connected in parallel to the output of the converter, and a subtracting means connected to the outputs of the counters. A time base controls operation of the supply means during a complete cycle to effect a counting operation of the first counter for a given period of time at the beginning of a cycle, a counting operation of the second counter for the same period of time but at the end of the cycle, and operation of the subtracting means at the end of the cycle.

REFERENCES:
patent: 3601586 (1971-08-01), Slavin
patent: 3617713 (1971-11-01), Karlsson
patent: 3878370 (1974-04-01), Santomango et al.
patent: 4164648 (1979-08-01), Chu
patent: 4397031 (1983-08-01), Weber

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