APPARATUS AND METHODS FOR INFRARED BEAM SMOKE DETECTION

摘要

Infra-red beam smoke detection apparatus comprises an infra-red transmitter or detector or both, in which the or each transmitter or detector is mounted in a housing for angular adjustment to vary the beam direction relative to a fixed axis of the housing, comprising an electrically-driven actuator for effecting the angular adjustment of the beam direction. Also, the infra-red beam transmitter has a visible light beam transmitter arranged selectively to transmit a collimated beam of visible light coaxially with the infra-red beam. A remote interface unit (RIU), for an infra-red beam smoke detection system comprising distributed infra-red transmitters and detectors, is formed to be fixed to a wall surface and to be connected to external cables for power and data transfer to and from the transmitters and detectors, and has electronic means for controlling the transmitters and detectors remotely through the external cables to ensure their optical alignment and to determine the presence of smoke so as to trigger an alarm. Also, an infra-red beam smoke detection apparatus comprises a base unit having an internal electrical wiring terminal arrangement for connection to an external electrical cable for power supply and data transfer; connectable by bayonet coupling to a head unit containing optical components and electronic circuitry and an electrical terminal arrangement connected to the electronic circuitry.