FDO400

Low profile optical smoke detector. Smoke detectors operate on the principle of light scattering caused by smoke particles in the air (TYNDALL effect). The detector has an automatic gain control function; a microcontroller calculates reading compensation to maintain constant sensitivity over time, correcting any increase in level caused by dust deposition inside the analysis cell. Smoke detectors must be installed where there are no drafts that could deflect the flow of particles produced by combustion and in places where normal activities do not produce fires involving gaseous materials.

• maintenance - green flashing with sequence of yellow flashes indicates fault condition.