Fire alarm system

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 11676477
APP PUB NO 20220246022A1
SERIAL NO

17571681

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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An object herein is to provide a fire alarm system which is capable of performing cable-deterioration diagnosis on a cable even if it is connected to a communication input type sensor. The fire alarm system includes: a sensor to which a communication signal to be used for detection is inputted intermittently; an input circuit unit for causing a current for measuring an impedance, to flow to the sensor constantly in a manner superimposed on the communication signal to be used for detection; a signal processor for measuring the impedance in a communication off-period of the communication signal; a storage in which a threshold value for the impedance is stored, the threshold value serving to determine deterioration of a cable connected to the sensor; and a controller for diagnosing, when the measured impedance exceeds the threshold value, that the cable connected to the sensor is deteriorated; to thereby perform cable-deterioration diagnosis.

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First Claim

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Patent Owner(s)

  • MITSUBISHI ELECTRIC CORPORATION

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hirabayashi, Keiichi Tokyo, JP 2 21

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