VESDA VLI Product Guide VESDA by Xtralis
52 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. The system will normalize the flow and then monitor the flow trend to set the flow fault thresholds.
During the learning cycle, 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 16 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 verify 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.
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