The OSI-RE-SS is actually a reflector- variety linear optical beam smoke detector intended to function to be a part of fire alarm units. The beam operates primarily on the theory of sunshine obscuration utilising an Infra-Crimson beam. Optical beam smoke detectors are uniquely suited to safeguarding structures with substantial open https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/