| 摘要 |
PURPOSE:To detect abrupt temperature variation by simple constitution by using plural heat sensing parts made of materials which differ in specific heat for heat sensors. CONSTITUTION:The heat sensors A and B use heat sensing element thermistors and their heat sensing parts are made of the materials which differ in specific heat. If abrupt temperature variation is caused by a fire, etc., a detected temperature difference is generated between the heat sensor A and heat sensor B. Consequently, a transistor (TR) 4 turns on and the display device 5 of a fire alarm system warns the fire occurrence.
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