FIRE/NON-FIRE DETERMINATION DEVICE AND FIRE/NON-FIRE DETERMINATION METHOD, AND FIRE ALARM UNIT

摘要

PROBLEM TO BE SOLVED: To provide a fire/non-fire determination device and a fire/non-fire determination method, capable of effectively determining between an actual fire and non-fire by detecting CO and smoke, and a fire alarm unit using the fire/non-fire determination device.;SOLUTION: The fire/non-fire determination device includes a smoke sensor 4 for detecting a smoke density, a calculation means 2 for calculating the gradient of a linearly approximated expression as a smoke density gradient Gs, based on multiple pieces of measured data of smoke density in which the smoke density detected at every prescribed detection timing by the smoke sensor 4 continuously varies between the first set smoke density and the second set smoke density set higher than the first set smoke density, calculating the maximum value of the difference between the measured data of smoke density and a smoke density value expressed by the primary expression as the smoke density difference maximum value |d|max, calculating a time integral value of smoke density as a whole area S, and calculating a fluctuating part obtained by removing a certain part of the time integral value from the whole area S as an area St, and determines whether it is a fire or non-fire based on the smoke density gradient Gs, the smoke density difference maximum value |d|max, and the area St or the whole area S.;COPYRIGHT: (C)2009,JPO&INPIT