The OSI-RE-SS is really a reflector- type linear optical beam smoke detector built to function to be a element of fireplace alarm programs. The beam operates totally on the theory of sunshine obscuration utilising an Infra-Crimson beam. OSI-R-SS can be a 4-wire conventional reflector-variety linear optical beam smoke detector for https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/