The beam operates totally on the principle of light obscuration utilizing infrared. The OSI-RI detector is actually a blended transmitter/receiver that could be specifically linked to an clever detector circuit in LiteSpeed® or CLIP manner. Unwelcome alarms as a result of beam remaining entirely obscured for a brief time period https://www.firesense.co.uk/type/addressable-fire-system/addressable-beam-detectors/