FIRE ALARM SYSTEM

PROBLEM TO BE SOLVED: To provide a fire alarm system which can detect fire in an early stage while suppressing erroneous fire detection.SOLUTION: In a fire alarm system, a plurality of sensors are communicatively interconnected. Each sensor comprises: a measurement unit for measuring a physical amou...

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Bibliographic Details
Main Authors NISHIDA MITSUTERU, AZUMA YOSHIAKI, KIKUCHI MASAKAZU, YOKOBAYASHI MASARU, FUJIWARA HIDEKI, YOSHIOKA YUKI
Format Patent
LanguageEnglish
Published 04.10.2012
Subjects
ALARM SYSTEMS
ORDER TELEGRAPHS
PHYSICS
SIGNALLING
SIGNALLING OR CALLING SYSTEMS
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Summary:PROBLEM TO BE SOLVED: To provide a fire alarm system which can detect fire in an early stage while suppressing erroneous fire detection.SOLUTION: In a fire alarm system, a plurality of sensors are communicatively interconnected. Each sensor comprises: a measurement unit for measuring a physical amount indicating a fire situation; and a transmission unit for transmitting an abnormality detection signal when a measured value measured by the measurement unit meets abnormality detection conditions for determining an abnormal situation. Also, at least one of the sensors has: a fire detection unit for detecting fire by comparing the measured value measured by the measurement unit with a predetermined fire detection threshold; a reception unit for receiving the abnormality detection signal from the other sensors among the plurality of sensors; and a threshold change unit for, on receiving the abnormality detection signal by the reception unit, lowering the fire detection threshold.
Bibliography:Application Number: JP20110050447