Fire detector

Details Fire detector Fire detector

1993-05-19

1997-09-23

Lee, Thomas D.

Communications: electrical

Condition responsive indicating system

Specific condition

340628, 250573, 356438, G08B 1710

Patent

active

056709480

ABSTRACT:
A fire detector capable of readily and accurately adjusting the sensitivity thereof and of not erroneously outputting any fire signal is provided with a first-stage amplifying circuit having an output adjusting variable resistor and a fire discriminating section having a reference voltage adjusting variable resistor. As a result, it is possible to adjust the amplified output to a predetermined value by the switching level of the fire discriminating section to a predetermined value by the reference voltage adjusting variable resistor.

REFERENCES:
patent: 3634839 (1972-01-01), Vassil
patent: 3710365 (1973-01-01), Barnes
patent: 3866195 (1975-02-01), Ried, Jr.
patent: 4081795 (1978-03-01), Ogawa
patent: 4097850 (1978-06-01), Conforti
patent: 4193069 (1980-03-01), Cooper et al.
patent: 4198627 (1980-04-01), Kakigi
patent: 4203100 (1980-05-01), Yamauchi et al.
patent: 4300133 (1981-11-01), Solomon
patent: 4317113 (1982-02-01), Honma
patent: 4524351 (1985-06-01), Kimura et al.
patent: 4654644 (1987-03-01), Dobrzanski

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