The OSI-RE-SS is actually a reflector- type linear optical beam smoke detector built to function to be a part of fire alarm programs. The beam operates primarily on the theory of light obscuration utilising an Infra-Purple beam. OSI-R-SS is a 4-wire conventional reflector-style linear optical beam smoke detector for use https://minibookmarking.com/story18667812/rumored-buzz-on-conventional-beam-detectors