VESDA VLI Product Guide VESDA by Xtralis
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5.5.3 Airflow Options
Airflow options provide the ability to set:
l limits for what the detector considers to be normal airflow behavior for the sampling pipe network
l which pipe inlets are being used
l aspirator speed
These settings should be confirmed in the ASPIRE2 design of the sampling pipe network.
Refer to Section 5.6 for the default settings.
Figure 5-13: Airflow Options
The Airflow configuration options are as follows:
Air Flow
The air flow conditions, as a percentage of the normalized air flow, that will cause a fault to be reported. If the
installation site flow conditions vary significantly, it is recommended that the Major High and Major Low
parameters are set closer to their limits.
l Major High: The level of air flow considered to be so far above normal as to require urgent attention.
l Minor High: The level of air flow considered to be above normal but not urgent.
l Minor Low: The level of air flow considered to be below normal but not urgent.
l Major Low: The level of air flow considered to be so far below normal as to require urgent attention.
Significant Flow Change
The amount of airflow change at which an event is recorded in the event log.
Delay
The length of time between the air flow fault threshold being reached and the relay operation.
Pipes in Use
The pipes that are actually being used. Refer to Section 4.3 on page 31 for further information.
Aspirator Speed
The speed of the aspirator.
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