| 摘要 |
PROBLEM TO BE SOLVED: To secure a fire monitoring function even when a line connecting a sensor is disconnected due to the collapse of a ceiling by earthquake. ! SOLUTION: In addition to a main sensor 12 disposed on a lower surface of a ceiling 16 of a caution zone, a ceiling suspending bolt 26 of a piping 22 is disposed with an auxiliary sensor 14. In a normal monitoring state, a main isolator 36a is controlled to be in a connected state by a main relay 38a in accordance with instructions from a R type receiver 10 so as to operate the main sensor 12 connected to a main branch line 32, and an auxiliary isolator 36b is controlled to be in a separated state by an auxiliary relay 38b to stop the auxiliary sensor 14 connected to an auxiliary branch line 34. An earthquake is detected by a seismoscope 25. When the main branch line 32 is disconnected due to the collapse of the ceiling 16 by the earthquake, the auxiliary isolator 36b is controlled to be in a connection state by the auxiliary relay 38b so as to ope |
