VESDA by Xtralis
VESDA VLP Product Guide
www.xtralis.com
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2
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. Up to four pipes can be connected to a VESDA VLP
detector.
1
Inside the VESDA VLP, a sample of air is passed into the laser detection chamber. Ultra-fine air filtration
provides very clean air to protect the optical surfaces inside the detector from contamination.
The detection chamber uses a stable Class 1 laser light source and carefully positioned sensors to achieve
the optimum response to a vast range of smoke types. 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 an alert, action, fire 1 or fire 2 alarm depending upon the alarm thresholds.
Air is exhausted from the VESDA VLP and may be vented back into the protected zone.
Legend
A
Air inlets from pipe networks
B
Air is drawn into the aspirator
C
Some air is filtered and:
D
flows into the chamber for testing
E
is filtered a second time, then used to flush the chamber with ultra clean air
F
All air is then vented
Figure 2-1: Operation and internal air flow of a VESDA VLP
1
For further information on air sampling pipe networks please see the Pipe Network Design and Installation
Manuals.
