The beam operates primarily on the principle of sunshine obscuration employing infrared. The OSI-RI detector is actually a mixed transmitter/receiver which might be specifically connected to an intelligent detector circuit in LiteSpeed® or CLIP manner. I comply with Ampac offering computer software updates, item updates, features and promotions through email https://www.firesense.co.uk/type/addressable-fire-system/addressable-beam-detectors/