Communications: electrical – Condition responsive indicating system – Specific condition
Patent
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.
Davis Paul H.
Rehn Larry A.
Tarpley Roy W.
Heiting Leo N.
Marshall, Jr. Robert D.
Sharp Melvin
Swann III Glen R.
Texas Instruments Incorporated
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