VESDA by Xtralis
VESDA VFT Product Guide
www.xtralis.com 3
1 Introduction
Welcome to the VESDA VFT Product Guide. This document is written to provide you with information on
technical specifications, cabling, and how to install, configure and operate these detectors.
VFT-15 detectors are aspirating smoke detectors that provide early warning of fire by analyzing air drawn
through microbore tubes. A highly sensitive detector chamber is able to detect smoke at very low
concentrations.
Figure 1-1: VESDA VFT
Embedded and PC software enable the configuration of a wide range of user defined parameters and reporting
capabilities and extended input and output functionality is achieved through the addition of plug-in modules.
Additional guidelines about the VESDA VFT system design are found in the Appendices:
l Appendix B on page 45 provides information regarding designing and installing the microbore tubes
l Appendix C on page 49 provides information on how to commission a system
l Appendix D on page 53 provides information on how to connect the detector to a PC for monitoring and
configuration and guidelines on how to correctly connect RS485 equipment
VFT detectors incorporate a rotary valve as a method of sampling individual microbore tubes and providing
addressability. This unique feature is described in Chapter 2.
The aspiration systems use an internal vacuum pump (high pressure system) and air flow is monitored
through the microbore tubes by a differential pressure sensor. As high pressure systems are capable of
drawing air samples through micro bore tubes, they are often preferred when installations need to be
unobtrusive.
While VFT detectors are primarily designed for applications where pin point addressability of fire source is
required. For the purpose of calculating sampling point spacing, the equivalent maximum area coverage for
the VFT-15 is 1500 m² (16,150 ft²) with 15 sampling tubes.
The basic system includes RS232, RS485 and TCP/IP interfaces for connecting to Xtralis VSC and Xtralis
VSM4 software. When connected by TCP/IP, Xtralis VSM4 enables the configuration and monitoring of a
large number of systems by a single PC, which can be accessed from anywhere via any standard internet
connection.
VFT-15 detectors are appropriate for EN54-20 Class A, B and C installations while VFT-15-C detectors are
suitable for EN54-20 Class C installations only.
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