Light isolated pilot light

Details Light isolated pilot light Light isolated pilot light

G - Physics

01

R

324/58

G01R 31/00 (2006.01) G01R 31/02 (2006.01) H05B 37/02 (2006.01)

Patent

CA 1192957

LIGHT ISOLATED PILOT LIGHT Abstract of the Disclosure A pilot light as might be used for monitoring an industrial con- trol circuit having a normal signal circuit connectable to a control circuit element for illuminating a lamp of the pilot light when such control circuit element is operated, and also having a test circuit connectable to a test switch for testing the integrity of the lamp when the test switch is operated. A circuit for supplying current to the lamp is light coupled to both the normal signal circuit and the test circuit thereby isolating the lamp from the signal and test circuits.

417871

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