Test circuit

Details Test circuit Test circuit

1975-08-28

1977-02-15

Sprague, Kenneth W.

Liquid heaters and vaporizers

Safety devices

Fire extinguishers

340214, 1225042, F22B 3742

Patent

active

040077136

ABSTRACT:
A test circuit for use with a boiler control circuit. A test switch and a lamp are connected between ground and a water level electrode. In the presence of a water path, a sufficient potential drop exists between ground and the electrode to light the lamp when the test switch is closed. If a ground or short exists, the lamp will not light.

REFERENCES:
patent: 2798214 (1957-07-01), Rowell
patent: 3366095 (1968-01-01), Leonardis
patent: 3803569 (1974-04-01), Iwasaki
patent: 3834357 (1974-09-01), Kaczmarek et al.

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