Air samples are continuously drawn from each protected space and conveyed by
Individual lines to the main cabinet. There the sample is inspected for the
presence of smoke.
Figure 2-1. Air Samples Being Sampled By Smoke Detection System
The presence of smoke in the viewing path of the light source causes the light to
scatter and be seen by the photocell. At a predescribed "smoke level" an alarm is
sounded.
Figure 2-2. Light Being Scattered By Presence of Smoke in Viewing Path
2-2
