Fluid detector

Details Fluid detector Fluid detector

1985-06-24

1987-02-17

Myracle, Jerry W.

Communications: electrical

Continuously variable indicating

Plural circuits, each for particular magnitude

73 492, 340605, G08C 1508

Patent

active

046443541

ABSTRACT:
A system for detecting fluid pollutants includes probes for sensing the presence of a polar liquid, a non-polar liquid, and a dry condition, and for producing a polar liquid signal, a non-polar liquid signal, and a dry condition signal. A reference circuit which includes a tunable element, such as a variable resistor, is used to set the probe output signals to a predetermined voltage value: e.g. a 1-volt value indicates a polar liquid, a 2-volt value indicates a non-polar liquid, a 3-volt value indicates a dry state, and a 5-volt value indicates that the circuit is on and operating. The output signals are multiplexed and output on a single output line. The definitive signal levels and the serial output mode permit an inexpensive single channel recorder to be used to provide a permanent and complete record of the probe status.

REFERENCES:
patent: 4221125 (1980-09-01), Oliver et al.
patent: 4586033 (1986-04-01), Andrejasich

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