Device for electric monitoring of the level of a liquid in a con

Details Device for electric monitoring of the level of a liquid in a con Device for electric monitoring of the level of a liquid in a con

1980-11-05

1982-11-30

Kazenske, E. R.

Measuring and testing

Liquid level or depth gauge

Thermal type

73292, 374110, G01F 2310

Patent

active

043610374

ABSTRACT:
A device for electric monitoring of the level of a liquid present in a container, with a temperature-dependent resistance probe which is immersed in the liquid the level of which is to be monitored, a source of constant current connectable, controlled by a timer, to the resistance probe, a circuit, controlled by the timer, for detecting and storing an initial voltage drop on the resistance probe at an initial time and a measurement voltage at a defined time after the connection of the source of constant current, and a circuit for evaluating these voltages by subtraction of the measurement voltage from the initial voltage and if necessary under circumstances inversion of the difference in order to form a display voltage which corresponds to the level. There are provided a resistance probe structure for compensating for the influence of the change in level of the liquid on the display voltage due to thermal expansion as a function of its initial temperature and a computation circuit for compensating for different heat transfers from the resistance probe to the liquid as a function of the initial temperature.

REFERENCES:
patent: 2753713 (1956-07-01), Mabey
patent: 4163391 (1979-08-01), Bezard
patent: 4299126 (1981-11-01), Heuwieser

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