Fire alarm system which distinguishes between different types of

Details Fire alarm system which distinguishes between different types of Fire alarm system which distinguishes between different types of

1992-09-14

1994-01-18

Hofsass, Jeffrey

Communications: electrical

Condition responsive indicating system

Specific condition

340628, 356340, 356341, 356343, 250574, 250575, G08B 1710

Patent

active

052802728

ABSTRACT:
A fire alarm system which radiates light towards a smoke detecting space. Scattered light resulting from smoke that may exist in the smoke detecting space is judged by a receiver with respect to the type of smoke that may prevail in the space. The presence of a fire is judged by comparing the light that has been received with a set threshold level. The threshold level is set to different levels in accordance with the type of smoke detected.

REFERENCES:
patent: 4103997 (1978-08-01), Araki et al.
patent: 4524281 (1985-06-01), Muggli et al.

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