VESDA VLS-XXX, Руководство по эксплуатации продукта, Страница: 10 / 48

LaserSCANNER Product Manual
VESDA
®
2
Each pipe inlet in the manifold has a valve that can open or close the flow of air to the pipe. The
scan function controls the opening and closing of the valves to detect the smoke carrying pipe.
See
The Scanning Function on page 3 for further information.
Some of the sampled air flows to the dual stage air filter. The first stage filtration removes dust
and dirt from the sampled air and a small percentage of this air then flows to the laser detector
chamber for detection 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 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.
Figure 1 - Operation and internal air flow of a LaserSCANNER
A
B
C
D
E
F
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