Xtralis VESDA VLI - B Glossary

VESDA by Xtralis VESDA VLI Product Guide
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B Glossary
A Aspirator Impeller type fan used to draw sampled air into the detector.
AutoLearn Smoke A feature which allows the detector to learn about its
environment (background pollution, differences between day
and night operations within the facility etc) in order to set
appropriate alarm thresholds for that environment.
AutoLearn Flow A feature which allows the detector to learn about its
environment (airflow patterns, differences between day and
night operations within the facility etc) in order to set
appropriate airflow thresholds for that environment.
B BACnet The data communications protocol used on the Ethernet
port.
C Capillary Tubes Flexible tubes attached to the sampling pipe network for
sampling specific areas or objects away from the sampling
pipe.
Commissioning The process of making a smoke detection system
operational.
D Disable Disables the alarm relay outputs from actuating (previously
known as Isolate) and indicates a fault.
E Event Log All VESDA detectors provide internal data logging of events
which have occurred in the protected zone.
F Fire This indicates a serious situation and may lead to automatic
generation of a normal fire alarm.
Fire Alarm ControlPanel (FACP) A panel which all fire detection products report their status
to.
G General Purpose Input (GPI)
Unmonitored
An input to a detector which can be used to place the
detector in a certain condition. Applying a voltage between
5V and 30VDC triggers the selected condition.
General Purpose Input (GPI) Monitored An input to a detector which is monitored for open or short
circuits. It can be used to monitor the power supply.
H High Airflow Environment Where there are 10 or more air exchanges per hour.
High Level Interface (HLI) A communications interface between a VESDA device and
other pieces of equipment using VESDAnet or another
communications protocol.
O Obscuration The reduction in light transmission per meter or per foot due
to the presence of particulates.
R Referencing A technique in which a detector is set up to provide
measurements of background smoke level. This reference
level is then subtracted from the readings of detectors in the
protected area to avoid nuisance alarms resulting from
background pollution.
Relay A device on a detector which allows external equipment to
be hard wired to it and be triggered when various conditions
occur (example, sounding a siren at Alert threshold).
S Sampling Network The pipe network constructed to allow the VESDA detector
to draw air for sampling.
Sensitivity Degree of response (i.e. activation of alarm condition) of a
detector. A high sensitivity denotes response to a lower
concentration of smoke than a low sensitivity.
Z Zone A defined area within the protected premises from which an
alarm signal can be received.