Xtralis VESDA VLS Product Manual page 11

Xtralis VESDA
®
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 will be reported as an alert,
action, fire 1 or fire 2 Alarm depending upon the set alarm thresholds. The second stage filtration
further filters the air to make it ultra clean air. The ultra clean air is used to protect the optical
surfaces in the laser detector chamber.
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 exhausted
www.xtralis.com
E
D
Figure 1 - Operation and internal air flow of a VLS
Xtralis VESDA VLS Product Guide
A
C
F
B
5