What is VESDA?
VESDA (an abbreviation of Very Early Smoke Detection Apparatus) is a laser based smoke detection system. The name VESDA has become a generic name for most air sampling applications. Operating within specialist fire detection applications for over 20 years, the VESDA system has a proven track record and has been developed beyond traditional fire alarms, to the point where it is recognised as the most advanced aspirating smoke detection system within the fire industry, holding more certifications than any other aspirating smoke detector in the world.
How Does VESDA Work?
VESDA works by continuously drawing air into a distributed pipe network via a high-efficiency aspirator. The air sample then passes through a dual-stage filter. The first stage removes dust and dirt from the air sample before it enters the laser detection chamber. 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 as well as minimizing nuisance alarms.
From the filter, the air sample goes through 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 and/or graphic display. VESDA detectors are able to communicate this information to a fire alarm control panel, a software management system, or a building management system via relays or a High Level Interface (HLI).
The VESDA-E VEA series of detectors combine VESDA reliability and early warning smoke detection with pinpoint addressability and a variety of annunciation options that truly surpass traditional spot detectors.
VESDA-E VEU DETECTOR
The VEU aspirating smoke detectors are the premium detector of the VESDA-E range. An ultra wide sensitivity range, 15 times greater than VESDA VLP, and provision for more sampling holes provide an increased coverage in high airflow applications by at least 40%.
VESDA-E VEP DETECTOR
The VESDA-E VEP series of smoke detectors bring the latest and most advanced detection technology to provide very early warning and the best nuisance alarm rejection to a wide range of applications.
The VESDA VLP is popular within the VESDA product range. Like all VESDA detectors, it detects fire at the earliest possible stage and reliably measures very low to high concentrations of smoke. It has the world’s widest sensitivity range of 0.005 to 20% obs/m (0.0015 to 6% obs/ft ).
The VESDA VLS is similar to the flagship VESDA VLP aspirating smoke detector but also includes a valve mechanism in the inlet manifold and software to control the airflow from the four sectors (pipes). This configuration enables a single VESDA zone to be divided into four separate sectors, for example, distinguishing between separate voids within a room.
VESDA VLC offers protection for small to medium areas that require cost effective very early warning. It offers the same wide sensitivity range as the VESDA VLP and VESDA VLS — 0.005 to 20% obs/m (0.0015 to 6% obs/ft).
The VESDA VLF delivers advanced and cost-effective very early warning for small environments. The VESDA VLF-250 model protects areas up to 250 m2 (2,500 sq. ft.), and the VESDA VLF-500 model covers up to 500 m2 (5,000 sq.ft.).