| 摘要 |
PURPOSE:To execute a safe escape guiding and to obtain the escape guiding device of a simple constitution and a low cost by changing a current value to flow to the device itself at the time of a dangerous condition sensing and equipping a transmitting means to turn on and off between the transmitting terminals of a load side with operating in correspondence to a current value change to flow in a closed circuit and a reception element provided parallely with the above-mentioned danger sensing means. CONSTITUTION:For example, when a fire occurs near a second floor of escaping stairs, a smoke sensing means S2 of a device Y2 provided on the second floor senses the smoke and a current is flown to a closed circuit 1''. Then, a short-circuit condition is obtained between terminals L-C and the operation of a guiding sound device V2 is prohibited. At such a time, a short-circuit is executed to terminals X-X' of a smoke sensing means S3 of a device Y3 provided near the doorway of a third floor and the operation of a guiding sound device V3 provided on the third floor is also prohibited. The device Y3 of the third floor receives an operation prohibiting signal from the device Y2 of the second floor and prohibits the operation of the guiding tone device V3. Moreover, samely in the following operations, the guiding sound device, which is provided on the upper floor than the second floor where the smoke is generated in the escaping stairs, is not operated. |
