Smoke detecting apparatus for fire alarm

Details Smoke detecting apparatus for fire alarm Smoke detecting apparatus for fire alarm

1993-06-28

1995-01-10

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340628, 340635, G08B 1710

Patent

active

053811313

ABSTRACT:
A smoke detecting apparatus includes a lamp, a light receiving element for receiving light from the lamp, and a smoke detecting circuit for detecting the smoke density in accordance with the signal outputted from the light receiving element. The apparatus further includes a light emission failure detector and counter for detecting a light emission failure in which the lamp fails to emit light in response to a light emission instruction from the smoke detecting and counting light emission failures, and a memory for storing the number of light emission failures. The apparatus may further include a warning unit which, when the number of failures becomes a predetermined value or more, warns that the lamp will soon be exhausted. Thus, the unit enables a maintenance person to replace the lamp without fail before it is exhausted.

REFERENCES:
patent: 3866195 (1975-02-01), Ried, Jr.
patent: 3881112 (1975-04-01), Roberts
patent: 4097850 (1978-06-01), Conforti
patent: 4193069 (1980-03-01), Cooper et al.
patent: 4321595 (1982-03-01), Tresch
patent: 4524351 (1995-06-01), Kimura et al.
patent: 4638304 (1987-01-01), Kimura et al.
patent: 4651013 (1987-03-01), Kajii et al.
patent: 4670741 (1987-06-01), Cole
patent: 4757306 (1988-07-01), Kimura
patent: 4827247 (1989-05-01), Giffone
patent: 4831564 (1989-05-01), Suga
patent: 4990895 (1991-02-01), Juds

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