The beam operates totally on the principle of light obscuration applying infrared. The OSI-RI detector is often a blended transmitter/receiver which can be straight linked to an smart detector circuit in LiteSpeed® or CLIP mode. I comply with Ampac furnishing application updates, product updates, gives and promotions by using email https://www.firesense.co.uk/type/addressable-fire-system/addressable-beam-detectors/