IMPROVEMENT TO SMOKE ALARMS

摘要

An environmental conditions detection alarm unit, particularly a smoke alarm which includes a sensor (23), a sounder (31), mains power terminal connections (1, 3), a terminal (27) adapted to interconnect with one or more other alarm units and a fourth terminal adapted to be in communicable relation with one or more external devices. The external devices may be a sprinkler system, alarm supervisory board, an additional external strobe or siren. The unit may be used in alarm systems of various configurations to initiate external devices or be initiated by external devices in addition to its communications with other alarm units.