Thermal system for measuring liquid levels

Details Thermal system for measuring liquid levels Thermal system for measuring liquid levels

1984-09-24

1986-05-27

Frankfort, Charles

Measuring and testing

Liquid level or depth gauge

Thermal type

340622, 137392, G01F 2322

Patent

active

045907978

ABSTRACT:
A thermal liquid level measuring system including a heat sensor with a sheathed heating resistor and a measuring resistor. Power is supplied to the heating resistor in a series of pulses. The measuring resistor is connected to two filters which extract the a.c. and d.c. components from the measuring signal. A temperature measuring device determines the difference in temperature of the liquid and the gas above the liquid. A computer receives signals from the filters and the temperature measuring device to determine the level of the liquid and its temperature.

REFERENCES:
patent: 3644885 (1972-02-01), Radin
patent: 3955416 (1976-05-01), Waiwood
patent: 3956760 (1976-05-01), Edwards
patent: 4125021 (1978-11-01), Kamei et al.
patent: 4319233 (1982-03-01), Matsuoka et al.
patent: 4423629 (1984-01-01), Ara et al.

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