Security alarm system with bypass

摘要: A battery operated alarm system including a more or less conventional closed circuit burglar loop in which are sensors that may open the so as to actuate bell other signaling device. In this system, resistor limits current passing normally loop, conserving power and also permitting further control of by an electronic door lock. One is switch will be bypassed when key inserted into lock, there time delay holding for permit person pass door. The includes loops such operation electric floor mat, one those utilized fire sensor remain at times has been actuated place out operation.