High sensitivity smoke detecting apparatus using a plurality of

Details High sensitivity smoke detecting apparatus using a plurality of High sensitivity smoke detecting apparatus using a plurality of

1993-07-15

1995-12-05

Groody, James J.

Communications: electrical

Condition responsive indicating system

Specific condition

340515, G08B 1710, G08B 2900

Patent

active

054733146

ABSTRACT:
A smoke detecting apparatus for a fire alarm has: a smoke chamber into which smoke to be detected is introduced, a light emitting lamp disposed in the smoke chamber, a light receiving element disposed in the smoke chamber so as to receive the light emitted from the light emitting lamp, an A/D converting circuit for converting the output signal from the light receiving element into a digital signal, a memory for storing data therein, a computing device for storing in said memory, as first calibration data, the output data from the A/D converting circuit when the smoke chamber is filled with a first reference gas, storing in said memory, as second calibration data, the-output data from the A/D converting circuit when the smoke chamber is filled with a second reference gas, and computing a proper smoke density corresponding to the output data from the A/D converting circuit on the basis of the first and second calibration data and the output data from the A/D converter circuit, and a display device for displaying the smoke density computed by the computing device.

REFERENCES:
patent: 3866195 (1975-02-01), Ried, Jr.
patent: 4097850 (1978-06-01), Conforti
patent: 4193069 (1980-03-01), Cooper et al.
patent: 4317113 (1982-02-01), Honma
patent: 4524351 (1985-06-01), Kimura et al.
patent: 4595914 (1986-06-01), Siegel
patent: 5212470 (1993-05-01), Thuillard
patent: 5281810 (1994-01-01), Fooks et al.

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