The OSI-RE-SS is really a reflector- style linear optical beam smoke detector created to work as being a part of fire alarm techniques. The beam operates totally on the principle of light obscuration utilising an Infra-Pink beam. OSI-R-SS is really a 4-wire conventional reflector-type linear optical beam smoke detector to https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/