Liquid absence detector

Details Liquid absence detector Liquid absence detector

1980-03-06

1982-07-27

Kreitman, Stephen A.

Measuring and testing

Liquid level or depth gauge

73 19, 73632, G01N 2902

Patent

active

043411169

ABSTRACT:
A system is provided for detecting the absence of liquid in a liquid chamber. A signal is transmitted through a liquid chamber and a signal is provided in response to the amplitude of the received signal. A receiving transducer receives an AC signal which is amplified and fed to a DC control circuit. A reference voltage is provided to one input of a comparator and the output of the DC control circuit is fed to the other input of the comparator. The comparator output provides the liquid absence signal if the difference between the reference voltage and the DC control circuit output voltage is less than a predetermined value.

REFERENCES:
patent: 3921622 (1975-11-01), Cole
patent: 3974681 (1976-08-01), Namery
patent: 4068521 (1978-01-01), Cosentino et al.
patent: 4121094 (1978-10-01), DiVito et al.
patent: 4122713 (1978-10-01), Stasz et al.
patent: 4202049 (1980-05-01), Wetzel

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