HEAT ANALOG-TYPE METHOD AND DEVICE FOR JUDGING FIRE

摘要

PURPOSE: To properly judge fire by means of a receiver or a repeating board by effectively utilizing an analog temp. detecting signal transmitted from an analog heat sensor. ;CONSTITUTION: An analog receiver 1 compares the level of the analog temp. detecting signal transmitted from an analog heat sensor 3 with a pre-alarm temp. level (constant temp. pre-alarm level) and judges it as pre-alarm at the time of exceeding the pre-alarm temp. level. The receiver 1 also compares the level of the analog temp. detecting signal with the fire temp. level (constant fire level) being higher than the pre-alarm temp. level and judges it as fire at the time of exceeding the fire temp. level (constant fire level). The receiver 1 calculates the reference temp. of this time based on the reference temp. of preceding time and the analog temp. detecting signal so as to judge it pre-alarm when temp. difference between the reference temp. of this time and the analog temp. detecting signal exceeds pre-alarm temp. difference and also to judge it as fire when temp. difference between the prevailing reference temp. and the analog temp. detecting signal exceeds fire temp. difference which is larger than pre-alarm temp. difference.;COPYRIGHT: (C)1993,JPO&Japio