Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1992-09-24
1994-12-27
Peng, John K.
Communications: electrical
Condition responsive indicating system
Specific condition
340634, 73 2331, G08B 1710
Patent
active
053769244
ABSTRACT:
A fire sensing method and apparatus for detecting a fire based on the detection of a hydrocarbon gas produced before fire ignition and the detection of a second fire indicating phenomenon. Such other phenomenon may comprise the detection of temperature, radiation or combustion product gases. The detection of hydrocarbon gas may generate a pre-alarm condition which permits the use of higher sensitivity conditions for the second fire indicating phenomenon.
REFERENCES:
patent: 3765842 (1973-10-01), Purt
patent: 4088986 (1978-05-01), Boucher
patent: 4630038 (1986-12-01), Jordan
patent: 4778113 (1988-10-01), Jewett et al.
patent: 5053754 (1991-10-01), Wong
patent: 5146209 (1992-09-01), Beghelli
Kaji Yukiko
Kubo Tetsuya
Ohtani Sigelu
Hochiki Corporation
Johnson Tim
Peng John K.
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