| 摘要 |
PROBLEM TO BE SOLVED: To provide a fire alarm device with which the no fire alarm, late alarm or missed alarm of sensor is decreased and further no burden is applied to a reception part. SOLUTION: In addition to a sensor means 1 and a fire judging means 2, this fire alarm device is provided with a 1st arithmetic means 3 for operating an average valve (m) of sensor output D while being connected to the sensor means 1, 2nd arithmetic means 4 for operating standard deviationσof sensor output D, and fire judgement reference value changing means 5 connected among these 2nd arithmetic means 4, 1st arithmetic means 3 and fire judging means 2 so as to change a fire judgement reference value X based on these average value and standard deviation.
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