Light isolated pilot light

Details Light isolated pilot light Light isolated pilot light

1982-03-18

1984-05-15

Dixon, Harold

Electric lamp and discharge devices: systems

Plural load device systems

315150, 315134, 324414, 340641, H05B 3700

Patent

active

044490763

ABSTRACT:
A pilot light as might be used for monitoring an industrial control 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.

REFERENCES:
patent: 3493760 (1970-02-01), Hoadley
patent: 3739334 (1973-06-01), Hocking
patent: 3938000 (1976-02-01), Higashide
patent: 4019128 (1977-04-01), Chebowski
Dual Input Pilot Lights, Product Data Sheet 800T, Jul. 1975, Allen Bradley Co.

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