Electricity: circuit makers and breakers – Special application – Liquid or moisture responsive
Patent
1982-01-18
1983-06-28
Scott, J. R.
Electricity: circuit makers and breakers
Special application
Liquid or moisture responsive
200 6105, H01H 2900
Patent
active
043907601
ABSTRACT:
A conductivity type in-line liquid sensing apparatus adapted for connection in a liquid supply line to sense interruption of the liquid supply in the line. The sensing apparatus includes a trap chamber having a liquid inlet tube and a liquid outlet tube and the outlet tube forms one electrode of an electrode pair. The outlet tube electrode has a gas vent opening at a level above the lower end of the other electrode of the electrode pair, to vent gas from the trap chamber and maintain the liquid level in the chamber above the lower ends of the electrodes, until the liquid supply is interrupted. A sensing circuit is connected to the electrode pair to apply a low voltage to the electrodes and cause a low current to pass between the electrodes when they are bridged by liquid in the trap chamber. The sensing circuit is arranged to actuate an output device in response to the change in conductivity that occurs when the liquid supply is interrupted and does not form a conductive bridge between the electrodes.
REFERENCES:
patent: 2839742 (1958-06-01), Sumner
patent: 3316368 (1967-04-01), Veau
patent: 3499130 (1970-03-01), Norred
patent: 4305420 (1981-12-01), Nussdorf
Pillote Vernon J.
Scott J. R.
Taylor Freezer Company
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