Oscillator energized liquid level indicator

Details Oscillator energized liquid level indicator Oscillator energized liquid level indicator

1975-08-04

1976-08-31

Caldwell, John W.

Communications: electrical

Systems

Call station

340 59, 331 65, G08B 2100

Patent

active

039784630

ABSTRACT:
An oscillator has its output coupled to a control element of a switch as well as to a probe. When the probe is in contact with liquid in a container, it is essentially grounded so that the switch is turned off. When, however, the liquid level falls below the probe, the oscillator output signal turns on the switch, which in turn illuminates an indicator lamp. A pair of latching circuits are connected from a point between the lamp and the switch to the oscillator and to the switch contact element and serve to bias the switch on and turn the oscillator off once the lamp has been illuminated.

REFERENCES:
patent: 2962641 (1960-11-01), Maltby et al.
patent: 3042908 (1962-07-01), Pearson
patent: 3614730 (1971-10-01), Bozoian
patent: 3644885 (1972-02-01), Radin
patent: 3689883 (1972-09-01), Hill
patent: 3694804 (1972-09-01), Hill
patent: 3868664 (1975-02-01), Hill
patent: 3889247 (1975-06-01), Voll
patent: 3911373 (1975-10-01), Ohtake et al.
patent: 3916213 (1975-10-01), Luteran

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