Light scattering smoke sensor

Details Light scattering smoke sensor Light scattering smoke sensor

1995-12-11

1997-09-23

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

340630, 361756, 361758, 250564, 250574, G08B 1710

Patent

active

056709471

ABSTRACT:
In a light scattering smoke sensor of the present invention, a first diaphragm portion is disposed just aheat of a light receiving device, and a second diaphragm portion is disposed ahead of the first diaphragm portion. A gap between the first and second diaphragm portion is a smoke introducing portion which introduces smoke to a smoke detecting space via a gap between labyrinth members and the second diaphragm portion.

REFERENCES:
patent: 4851819 (1989-07-01), Kawai et al.
patent: 5021677 (1991-06-01), Igarashi et al.
patent: 5302837 (1994-04-01), Sawa et al.
patent: 5381130 (1995-01-01), Thuillard et al.
patent: 5400014 (1995-03-01), Behlke et al.
patent: 5430307 (1995-07-01), Nagashima
patent: 5451931 (1995-09-01), Muller et al.
patent: 5486816 (1996-01-01), Ariga et al.

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