| 摘要 |
PROBLEM TO BE SOLVED: To provide a fire alarm for clarifying the exchange period of a smoke sensor, and for reducing maintenance costs or labors, and the arithmetic method of the exchange period of the smoke sensor. SOLUTION: The fire alarm X is provided with a scattered light type smoke sensor S having a smoke sensing function, an alarm means 10 for emitting alarm when smoke with a predetermined value or more is detected by the scattered light type smoke sensor S, an exchangeable power source part 20 for supplying a driving power to the scattered light type sensor S, a sensitivity checking means 30 for checking the sensor sensitivity of the scattered light type smoke sensor S when any smoke does not exist, a sensitivity history storing means 40 for storing the sensor sensitivity acquired by the sensitivity checking means 30 and a means 50 for performing the arithmetic operation of the exchange period of the scattered light type smoke sensor S based on the sensor sensitivity stored in the sensitivity history storing means 40. This method for performing the arithmetic operation of the exchange period of the scattered light type smoke sensor S is executed when exchanging the power source part 20. COPYRIGHT: (C)2007,JPO&INPIT
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