Material level indication

Details Material level indication Material level indication

1991-10-02

1992-11-10

Cuchlinski, Jr., William A.

Measuring and testing

Liquid level or depth gauge

With illumination

307118, 340619, 250577, G01F 2300, G01N 2149

Patent

active

051614111

ABSTRACT:
A system for indicating level of material that includes first and second probes disposed for operative coupling with material whose level is to be sensed. First and second electrical input circuits are respectively coupled to the probes and provide first and second signals. First and second electrical output circuits provide respective indications of material level by operating relay switches. A latch circuit has inputs that receive the respective first and second signals, and an output that changes state only when both first and second signals change state. The output circuits are selectively connected by jumpers either to the associated input circuit or to the latch output.

REFERENCES:
patent: 3468604 (1969-09-01), Matkovich et al.
patent: 4244385 (1981-01-01), Hotine
patent: 4392032 (1983-07-01), Roach, II
patent: 4410886 (1983-10-01), Motsinger
patent: 4499766 (1985-02-01), Fathaver et al.
patent: 4600844 (1986-07-01), Atkins
patent: 4713552 (1987-12-01), Denis et al.
patent: 4961069 (1990-10-01), Tsaprazis
patent: 5088324 (1992-02-01), Nemath

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