Autoreferencing liquid level sensing apparatus and method

Details Autoreferencing liquid level sensing apparatus and method Autoreferencing liquid level sensing apparatus and method

1980-08-11

1982-04-20

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

73295, 137386, 340501, G08B 2100

Patent

active

043261990

ABSTRACT:
An autoreferencing liquid level sensing apparatus and method determines the presence of a liquid by observation of the convective cooling rate of a heated temperature sensor. The temperature measured by the temperature sensor is compared with an adapting temperature reference whose initial value is determined from the initial measured temperature and whose value increases during the heating at a rate proportional to the rate of heating of the temperature sensor and the initial temperature. This comparison enables discrimination of whether the convective cooling rate of the temperature sensor is above or below a predetermined level. Because the rate of convective cooling depends in large part on the thermal capacity of the fluid surrounding the sensor, the convective cooling rate determination allows discrimination of whether the temperature sensor is surrounded by a gas or a liquid, or surrounded by one of two immiscible liquids having differing thermal properties.

REFERENCES:
patent: 3955416 (1976-05-01), Waiwood
patent: 4036053 (1977-07-01), Jenkins
patent: 4163391 (1979-08-01), Bezard et al.
patent: 4244050 (1981-01-01), Weber et al.

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