How does a VESDA works?

2. VESDA is a laser based smoke detection
system.
It is an Aspirating Smoke Detector (ASD),
so as well as detecting smoke like an
ordinary smoke alarm, a VESDA tests the
local environment for hazardous or
combustible gases.
VESDA detectors are normally used
where high smoke sensitivity is required.
Such as server rooms, data centers &
areas with sensitive equipment.

3. VESDA aspirating smoke detection solutions with continuous air sampling provide the
earliest possible warning of an impending fire hazard. VESDA detectors have multi-level
warnings and a wide range of sensitivity that does not degrade or change over time, so even
minute levels of smoke can be detected before a fire has time to escalate. Aspirating Smoke
Detectors can typically detect smoke before it is visible to the naked eye.

4. HOW DOES A VESDA SYSTEM WORKS
VESDA WORKS BY CONTINUALLY DRAWING AIR INTO THE PIPE NETWORK VIA A HIGH EFFICIENCY ASPIRATOR. A
SAMPLE OF THIS AIR IS THEN PASSED THROUGH A DUAL STAGE FILTER.
THE FIRST STAGE REMOVES DUST AND DIRT FROM THE AIR SAMPLE BEFORE IT ALLOWS THE SAMPLE TO ENTER THE
LASER DETECTION CHAMBER FOR SMOKE DETECTION.
THE SECOND (ULTRA FINE) STAGE PROVIDES AN ADDITIONAL CLEAN AIR SUPPLY TO KEEP THE DETECTOR’S OPTICAL
SURFACES FREE FROM CONTAMINATION, ENSURING STABLE CALIBRATION AND LONG DETECTOR LIFE.

5. During this process, the air
sample is passed through to the
calibrated detection chamber
where it is exposed to a laser
light source. When smoke is
present, light is scattered within
the detection chamber and is
instantly identified by the highly
sensitive receiver system. The
signal is then processed and
presented via a bar graph display,
alarm threshold indicators or
graphic display. The VESDA
detectors are able to
communicate this information to
a fire alarm control panel via
relays or a High Level Interface.
Chamber

6. Functioning of
VESDA

7. ASDs are suitable for environments where a highly
sensitive rapid smoke detection capability is required. This
makes them suitable in clean rooms; areas which contain
goods easily damaged by fire, such as tobacco, electronic
rooms and highly flammable liquid and gases.
VESDA is the right choice for the vital protection of
DataCom & TeleCom Infrastructure.
FOR MORE INFORMATION
Contact
info@zapfire.org
9717304877