| 摘要 |
PROBLEM TO BE SOLVED: To evade an unexpected situation where a fire extinguishing function is not operated when a fire is generated or the like by judging that disconnection is generated in the electric wire when the resistance of the electric wire from a fire sensor to an electric control part becomes equal to or higher than the resistance value of a prescribed temperature and displaying the disconnection to a display means. SOLUTION: When the disconnection is generated in the electric wire from the fire sensor 6 to the electric control part for activating a fire extinguishing equipment, electric resistance becomes infinitely large and the resistance of a thermister used in the fire sensor 6 is decreased when a temperature becomes high, is increased when the temperature becomes low and exceeds 1000KΩwhen the temperature becomes -30 deg.C. Then, as a concrete standard, in a stage where a resistance state equal to or lower than -30 deg.C continues for 2 seconds for instance in the electric circuit resistance of the fire sensor 6, it is judged that the disconnection is generated in the electric wire from the fire sensor 6 to the electric control part for activating the fire extinguishing equipment, an abnormality display lamp is lighted through a microcomputer inside a control part for it and the generation of the disconnection is displayed.
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