The OSI-RE-SS can be a reflector- sort linear optical beam smoke detector made to work for a element of fire alarm units. The beam operates totally on the principle of sunshine obscuration utilising an Infra-Red beam. OSI-R-SS can be a 4-wire conventional reflector-form linear optical beam smoke detector for use https://bookmarkjourney.com/story18579794/examine-this-report-on-conventional-beam-detectors