VESDA (Very Early Warning Smoke Detection) solutions with continuous air sampling provide the earliest possible warning of an impending fire hazard. VESDA buys time to investigate an alarm and initiate an appropriate response to prevent injury, property damage or business disruption. And because VESDA has the industry’s widest sensitivity range and multi-level warnings, even minute levels of smoke can be detected before a fire has time to escalate.
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 aswell as minimising 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 and is instantly idenitifed 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 VLF by Xtralis is an aspirating smoke detector ideal for small, business-critical spaces. Available in two models, the VLF-250 covers up to 250 square meters (2,500 square feet), and the VLF-500 covers areas up to 500 square meters (5,000 square feet).
The VESDA VLC by Xtralis has been designed to provide all the benefits of aspirating smoke detection, including very early warning, in single and small environments where space is at a premium. The VESDA VLC is available in two versions, one that interfaces via relays only (RO) and one that interfaces via relays and VESDAnet (VN).
The VESDA VLP by Xtralis is the flagship of the VESDA aspirating smoke detection product range. Using unique detection principles, the VLP has an alarm sensitivity range of 0.005%–20% obscuration/m (0.0015%–6.25% obscuration/ft). The detector can form part of a modular system with the display, programmer and VESDAnet modules installed in a remote location or as a "self-contained" system by replacing the detector's panels with display and/or programmer modules. With the display and programmer remote, the user interfaces for many Xtralis VESDA VLP detectors can be grouped together in a cabinet for easy programming.
The VESDA VLS by Xtralis is similar to the standard VESDA VLP 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. The VLS locates the origin of smoke by identifying the first sector (pipe) with the highest level of smoke and then continues to sample from all sectors to monitor fire growth. The VLS provides four alarm levels for each individual pipe (Alert, Action, Fire 1 and Fire 2). Sector factors (sensitivity) can be set individually to ensure the optimal alarm thresholds are applied for each sector. An extra LED indicates when the first alarm sector has been established