| 摘要 |
PROBLEM TO BE SOLVED: To provide a fire alarm system for preventing any erroneous fire alarm from happening regardless of how the surrounding temperature of a heat sensor is increased. SOLUTION: A storage type fire receiver R is combined with a differential type heat sensor P. The storage type fire receiver R is provided with a sensor power supply control means 21A for stopping power supply to the differential type fire sensor P, and for resuming power supply after the lapse of a predetermined non-conduction time since the differential type heat sensor P is reset. The differential type heat sensor P calculates a difference between temperature data written in a temperature data storing part 11, that is, the latest temperature data and temperature data of a fixed time before, and discriminates whether or not the difference is a threshold value or more, and when the difference is the threshold or more, the differential type heat sensor P outputs a fire detection signal, and stores the result of the output of the fire detection signal in a fire detection signal output history storing part 15 and stores a series of temperature data among the temperature data of the temperature data storing part 11 other than the temperature data before the lapse of the non-conduction time since the fixed time before. COPYRIGHT: (C)2004,JPO&NCIPI
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