VESDA VESDA VLF-500-UL 7Ed Product Guide
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11 Glossary
A Aspirator Impeller type fan used to draw sampled air into the detector.
C Capillary Tubes Flexible tubes attached to the sampling pipe network for
sampling specific areas or objects away from the sampling
pipe.
D Disable Disables the fire 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 FCC Compliance Federal Communications Commission.
Fire 1 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) The General Purpose Input is a programmable input.
H High Airflow Environment Where there are 10 or more air exchanges per hour.
I Instant Fault Finder Illuminates one or more segments of the Smoke Dial with
corresponding fault numbers.
O Obscuration The reduction in light passing through a uniform length due
to the presence of particulates.
R Relay The connection on a VESDA 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 Relative 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,
under identical smoke build-up conditions.
V VESDA Brand name for the range of smoke detectors.
VESDA VLF An air sampling smoke detector using light scattering to
report smoke obscuration.
Xtralis VSC A PC based program tool.
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