| 摘要 |
PROBLEM TO BE SOLVED: To appropriately determine fire to provide an alarm, without detection delay or a false alarm, even when performing differential type fire determination in which a temperature rise rate is obtained with an alarm unit on the basis of the measured temperature of a temperature measuring chip to be compared with a threshold.SOLUTION: Temperature measuring chips 10-1-10-4 are set at and near a sofa 1, a heater 2, and a trash box 3 to transmit temperature measurement signals to an alarm unit 100. The alarm unit 100 performs fire determination (differential type fire determination) to provide an alarm, in the case of a temperature rise rate of a measured temperature having a predetermined threshold or more. The alarm unit 100 corrects the predetermined threshold with a predetermined correction coefficient based on the assumption of a temperature rise in setting environment of the temperature measuring chips, and compares the corrected threshold with the detected temperature rise rate to perform fire determination. When a slow temperature rise associated with fire is assumed, the alarm unit 100 performs correction in which the predetermined threshold is multiplied by a correction coefficient less than 1 to lower a threshold, compares it with the corrected predetermined threshold to perform fire determination, and thereby preventing delay in fire determination. |
