Security Alarm Systems

Product Description
Purchase includes free access to book updates online and a free trial membership in the publisher’s book club where you can select from more than a million books without charge. Chapters: Smoke Detector, Fire Alarm Control Panel, Flame Detection, Fire Alarm System, Distributed Temperature Sensing, Fire Alarm Notification Appliance, Simplexgrinnell, Fire Alarm Pull Station, Aspirating Smoke Detector, Cooper Wheelock, Federal Signal Corporation, Fire Alarm Box, Heat Detector, Flame Detector, Gentex, En 54, Faraday, Space Age Electronics, Notifier, Holtzer-Cabot, Standard Electric Time Company, Fire-Lite, System Sensor, Control and Indicating Equipment, Honeywell Life Safety Group, Benjamin Electric Manufacturing Company, S.h. Couch, Flarebrands. Excerpt: An aspirating smoke detector (ASD), consists of a central detection unit which sucks air through a network of pipes to detect smoke. The sampling chamber is based on a nephelometer that is capable of detecting the presence of smoke particles suspended in air by detecting the light scattered by them in the chamber. In most cases aspirating smoke detectors require a fan unit to draw in a representative sample of air from the protected area through its network of pipes, such as is the case for Wagner and Xtralis ASD systems. Aspirating smoke detectors are highly sensitive, and can detect smoke before it is even visible to the human eye. They are not recommended for use in unstable environments due to the wide range of particle sizes that are detected. This does not mean they can’t be used in dusty/dirty environments, as long as the levels of aerosol remain stable. A TOP-SENS2 ASD unit made by Wagner (Germany). This unit is special in that it has two detection chambers which come before a unified fan. History In 1970 the Australian Commonwealth Scientific and Industrial Research Organisation (CSIRO) used a nephelometer to carry out research into forest fires . Subsequently, the Australian Postmaster-General’s Departme…

Fire Detection and Alarm: Smoke Detector, Fire Alarm Control Panel, Flame Detection, Fire Alarm System, Distributed Temperature Sensing