FIRE ALARM SYSTEM

专利名称：FIRE ALARM SYSTEM发明人：SADATAKE YUCHI申请号：AU2637888申请日：19881130公开号：AU2637888A公开日：190601

摘要：In a fire alarm system including a plurality of addressable detectors (203A...N)connected to a main circuit (202a,202b) connected to a central receiving unit (201), anyalarmed detector is discriminated and indicated in accordance with its address by thereceiving unit (201). In this system, each addressable detector is assigned as a groupmaster detector to each of the areas under surveillance and is conected to a plurality ofslave detectors (204A...N) within the same area under surveillance which have noaddressing function. Each of the addressable detectors (203A...N) includes a currentlimiting circuit (218) which on receipt of an alarm signal limits the amount of currentsupplied to the main circuit (202a,202b) to which the addressable detector (203A...N) isconnected, and a changeover circuit (Tr1,Tr2) for changing over the limited current valueby the current limiting circuit (218) to a lower value in response to an address-designatedcontrol signal supplied form the receiving unit (201) when the number of alarmeddetectors exceeds a predetermined number.

申请人：HOCHIKI CORPORATION

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