| 摘要 |
Abstract SMOKE OR FIRE BARRIER An alarm system for a smoke or fire barrier, including alarm circuits have a normally closed switch position. A control circuit connected to the alarm circuits applies a voltage to create a non-activation situation or remove a voltage to create an activation situation when the switch is open. The alarm circuit further including 10 either a series connected resistance or a normally open switch position in parallel to the normally closed switch position, to create a "fault" condition in the absence of detection of the resistance, or an open switch position and a closed switch position. Figure 1 - *"*'< I -N -C----- -- C C-- -- C -C, --- C,--- 1" -7 C- -C-CC-C, -C / r-~-- 7] C- IL -~ -I 0.-C-- L- |
