The beam operates primarily on the basic principle of sunshine obscuration using infrared. The OSI-RI detector is usually a put together transmitter/receiver that could be specifically connected to an intelligent detector circuit in LiteSpeed® or CLIP manner. Undesirable alarms due to beam becoming absolutely obscured for a brief time period https://www.firesense.co.uk/type/addressable-fire-system/addressable-beam-detectors/