Device for electrically monitoring the level of a liquid present

Details Device for electrically monitoring the level of a liquid present Device for electrically monitoring the level of a liquid present

1982-08-10

1984-08-21

Goldberg, Gerald

Measuring and testing

Liquid level or depth gauge

Thermal type

73304R, G01F 2300

Patent

active

044662823

ABSTRACT:
In a device for electrically monitoring the level of a liquid present in a container, a plurality of temperature-dependent resistance probes (n-1, n, n+1) are arranged at different heights in the container, they being adapted to be connected one after the other to a source of constant current (5) under the control of a program control device. For the evaluation of the voltage at one resistance probe (for example n+1) connected at the time to the source of constant current (5), a differentiator (6) is provided as well as a comparator (7), which is arranged behind the former and is and acted on by a threshold voltage and is connected to circuitry for forming a display signal. The circuitry comprises counter (4, 19) which counts the number of resistance probes (n-1, n, n+1) whose voltage differential is above the threshold voltage after connection to the source of constant current (5).

REFERENCES:
patent: 4036053 (1977-07-01), Jenkins
patent: 4283719 (1981-08-01), Williams
patent: 4425795 (1984-01-01), Albrecht

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