The OSI-RE-SS is usually a reflector- sort linear optical beam smoke detector built to operate like a component of fireplace alarm techniques. The beam operates totally on the principle of light obscuration utilising an Infra-Crimson beam. Beam smoke detectors is usually an essential ingredient of the effectively-designed automated fireplace alarm https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/