Method and apparatus for sensing liquid level

Details Method and apparatus for sensing liquid level Method and apparatus for sensing liquid level

1981-10-05

1984-01-03

Gill, James J.

Measuring and testing

Liquid level or depth gauge

Thermal type

374 54, G01F 2322

Patent

active

044236298

ABSTRACT:
Method and apparatus for sensing liquid level of the invention includes a plurality of thermocouple elements that are formed by connecting two kind of thermocouple wires alternately in series into a plurality of thermometric contacts. The two kind of thermocouple wires have different thermoelectric powers SA and SB and have a variety of predetermined lengths. The invention can sense with high reliability a liquid level of a sensed liquid by changing electromotive forces from these thermocouple elements into binary signals by using fewer thermocouple elements than the conventional apparatus. The invention also includes thermocouple elements for parity check to self-diagnose the sensed result to inspect easily and securely errors in operation due to disconnections in the thermocouple elements or external noises.

REFERENCES:
patent: 2702476 (1955-02-01), De Boisblanc
patent: 3964311 (1976-06-01), Holmen

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