Apparatus for monitoring the liquid level in a tank

Details Apparatus for monitoring the liquid level in a tank Apparatus for monitoring the liquid level in a tank

1976-02-26

1977-10-11

Caldwell, John W.

Communications: electrical

Systems

Call station

73295, 307118, 361178, 340214, G08B 2100

Patent

active

040538745

ABSTRACT:
In apparatus for monitoring the liquid level in a tank which includes a resistance bridge supplied with d-c current having two bridge arms arranged inside the tank, one of which is electrically heated, with the output of the resistance bridge followed by a signal stage with a binary indication and by a current regulator for the heating current, and a testing arrangement for simulating a given filling level, the resistance bridge is supplied from a constant current source whose current is switched from one current value to another upon the operation of the testing device in order to preclude operating disturbances during the testing.

REFERENCES:
patent: 3898554 (1975-08-01), Knudsen
patent: 3922658 (1975-11-01), Harper et al.

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