VESDA VLI Product Guide
VESDA by Xtralis
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www.xtralis.com
6.2
AutoLearn Flow
AutoLearn Flow process is initiated within Xtralis VSC.
During the AutoLearn Flow process, the detector determines the average and peak air flow levels
monitored over time and sets suitable air flow thresholds that will not give rise to nuisance flow faults
due to normal flow variations (such as might arise through air-conditioning related nuisance faults).
The system will normalize the flow and then monitor the flow trend to set the flow fault thresholds.
During the learning cycle, flow faults can be reported. If a flow fault is reached, AutoLearn will not
complete its cycle. In this situation the user must restart the AutoLearn process. If AutoLearn is
halted, the flow thresholds will be left at the previous settings.
Conditions experienced during learning are assumed to be representative of normal operating
conditions.
The AutoLearn Flow learning times range from 15 minutes to 15 days, with the default being set to
14 days.
6.3
Commissioning Smoke Test
It is recommended that a smoke test be carried out to prove the integrity of the pipe network, to
demonstrate that the system is working and to measure the transport time to the detector.
This test involves introducing a smoke sample at the furthest sampling hole and then measuring the
time taken for the smoke to travel to the detector. Results are logged and compared to subsequent
tests to note variations of the system.
Refer to the VESDA Commissioning Guide for details of the commissioning smoke test.
