Detectors 152
Detectors 152 : Particle Detectors: (4.14) Optical Beam Smoke Detector: (3) Limitations: Early examples of optical beam smoke detectors were prone to false alarms, which were caused by many different factors. Most commonly, the build-up of dust, dirt and other debris would lower the detection threshold for the detector, causing the system to enter alarm when no fire was present. Modern devices useautomatic gain control as a means of adapting the signal for these effects. Building movement is another common problem, where movement of the building causes the optical beam smoke detector to lose alignment. Motorised beam detectors have partially addressed this issue, but it can still be problematic in certain installations
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