The beam operates primarily on the principle of light obscuration employing infrared. The OSI-RI detector is usually a combined transmitter/receiver that may be immediately linked to an smart detector circuit in LiteSpeed® or CLIP manner. The 302-ET-194 Thermotech rate-anticipation heat detector from Honeywell NOTIFIER operates in a managed choice of https://www.firesense.co.uk/type/addressable-fire-system/addressable-beam-detectors/