The beam operates primarily on the basic principle of light obscuration applying infrared. The OSI-RI detector is actually a merged transmitter/receiver which can be straight linked to an smart detector circuit in LiteSpeed® or CLIP manner. The 302-ET-194 Thermotech fee-anticipation warmth detector from Honeywell NOTIFIER operates in a managed array https://www.firesense.co.uk/type/addressable-fire-system/addressable-beam-detectors/