Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1993-07-27
1995-04-18
Groody, James J.
Communications: electrical
Condition responsive indicating system
Specific condition
73304R, 429 92, 340618, G08B 2100, G01F 2300, H01M 1048
Patent
active
054082234
ABSTRACT:
A two-level detector for an electrically conductive liquid having a common electrode serving as a potential reference and situated at a low level, a high electrode situated at a high level, and a low electrode situated at the low level, the electrodes being connected by conductors to electronic apparatus for detecting the liquid at said two levels by means of currents flowing through the liquid. The high and low electrodes are made of metals that have different electrode potentials. A first conductor and a second conductor interconnect the electrodes to constitute an electrical primary cell that is short-circuited when both electrodes are simultaneously in contact with the liquid. The second conductor is extended to connect the electrode assembly to a signal terminal of the electronic apparatus. The common electrode is made of a metal whose electrode potential is different by about 0.4 volts from that taken by the first and second conductors of the equipotential link between the high and low electrodes when all three electrodes are in the liquid; the common electrode is connected to a common terminal of the electronic apparatus. The electronic apparatus constitutes a self-latching electronic relay which latches when a voltage above a voltage threshold of about 0.4 volts appears across the signal and common terminals because of the high electrode making contact with the liquid, and which automatically applies a voltage to said signal and common terminals that replaces the voltage from the high electrode when the liquid level drops.
REFERENCES:
patent: 3996579 (1976-12-01), Dahl
patent: 5216288 (1993-06-01), Greene
Groody James J.
Miller John W.
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