公开(公告)号：US3964044A

公开(公告)日：1976-06-15

申请号：US527953

申请日：1974-11-29

申请人： Anthony R. Busco

发明人： Anthony R. Busco

IPC分类号： G08B13/22 ,  G08B17/06 ,  G01D21/04 ,  G08B13/10

CPC分类号： G08B13/22 ,  G08B17/06

摘要： An alarm system uses a series string of sensors including burglar, fire and cold detectors in series with a relay coil. The coil when activated, assures that all sensors are indicating a no fault condition and a contact associated with the coil, energizes a source of light to illuminate a photo detector. Upon an intrusion, the coil is energized causing an alarm to activate, which alarm may cause another alarm to continue warning of a fault in spite of a predetermined reset condition, which may undesirably occur.Other embodiments show a technique of monitoring a plurality of secured locations to determine the exact one experiencing a fault.