VESDA by Xtralis VESDA VLC Product Guide
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3 Operation
An air sampling pipe network collects air samples from a protected area. The integrated aspirator
draws air into the sampling pipes through a pipe inlet manifold. For further information on air
sampling pipe networks please see the Pipe Network Design and Installation Manuals.
Some of this air flows to the dual stage filter. The first stage air filter removes dust and dirt from the
sampled air and flows to the laser detector chamber to detect the presence of smoke.
Any smoke detected in the laser detection chamber is signaled to the main processor card. If the
presence of detected smoke is higher than the set thresholds it is reported as a Pre-Alarm or an
Alarm depending upon the alarm thresholds. The second stage filter further filters the air to produce
ultra clean air. The ultra clean air is used to clean the optical surfaces in the laser detection chamber.
Figure 3-1: Operation and internal air flow of the VLC Detector
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