VESDA by Xtralis Introduction to the VESDA System Design Manual
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2 Introduction to Aspirating Smoke Detection
Aspirating Smoke Detection Systems incorporate a network of pipes with sampling holes continuously
collecting air samples from the area being protected. The sample air in the pipe network is drawn to the
detector by a high efficiency aspirator. The detector can detect minute concentrations of smoke, this is
expressed as % obs per meter or foot.
The success of an ASD system is dependent upon the smoke reaching the sampling holes and being
efficiently transported to a detector. A well designed pipe network takes into account the natural and
mechanically induced airflows within a customer site to ensure that air travels in the direction of the sampling
holes. The length of the pipe and the number of changes in direction of the pipe will impact on the efficiency of
an ASD System.
Note: Refer to the VESDA Pipe Network Design Guide, Pipe Network Installation Guide and the ASPIRE2
User Guide for information on proper pipe network design and installation.
The versatility of the VESDA System means that it can be successfully used in a diverse range of industry
sectors and application environments. For information on designing systems to meet the requirements of a
specific application environment, refer to the extensive collection of Application Design Guides available from
the partner extranet at www.xtralis.com, or by contacting your nearest VESDA Sales Office.
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