VESDA by Xtralis VESDA VLI Product Guide
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5.5.7 Referencing Options
Referencing is a technique used to reduce false alarms.
The VLIîrequires VESDAnet connectivity to separate detector located outside of the protected area, which is
used to take readings of the background level of smoke and pollutants outside of the protected area. These
readings are then referenced to the readings from the detectors in the protected area. This allows the
detectors inside the protected area to determine if a rise in smoke levels is due to background pollution or a
problem inside the protected area.
Refer to Section 5.6 for the default settings.
Figure 5-17: Referencing Options
The Referencing configuration options are as follows:
l Referencing Enabled: If checked, referencing is enabled.
l Detector: The name of the detector or system which provides the reference signal. Select from other
detectors on the VESDAnet.
l Delay: The length of time between the external smoke rise and the internal subtraction of the smoke rise.
l Dilution Factor: The percentage of the reference signal to be subtracted from the internal detector signal.
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