Introduction to the VESDA System Design Manual VESDA by Xtralis
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VESDA VLC - The VESDA VLC is connected to one pipe that may be branched into two. The VESDA VLC
has three Alarm Thresholds. For further details see the VESDA VLC Product Manual.
Figure 4-3: VESDA VLC Detector
VESDA VLF - The VESDA VLF is connected to one pipe that comes with a number of preconfigured pipe
layouts. The VESDA VLF has four alarm thresholds. For further details, refer to the VESDA VLF Product
Guide.
Figure 4-4: VESDA VLF Detector
An aspirator in each detector draws air through the pipe network into a pipe inlet manifold to a two stage air
filter cartridge. The two stage air filter cartridge filters the sampled air, which then flows on to the laser
chamber. Most of the filtered air sample is used to detect the presence of smoke, the remaining air is used to
protect the optical surfaces in the laser chamber. The laser chamber can detect smoke at minute levels of
obscuration. If smoke is detected it is reported through the CPU card to the display assigned to the detector.
Presence of smoke can also be displayed on a LCD Programmer or through Xtralis VSC Software. The
detector can be configured to raise alarms at different levels and/or report events through a Fire Alarm Control
Panel (FACP).
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