Perimeter security solutions from Elvey International

May 2003 Perimeter Security, Alarms & Intruder Detection

Detection of unwanted intruders before they enter the premises is rapidly becoming the more preferred route taken by installers of alarm systems today. The method of detection can vary from outdoor infrared beams to advanced outdoor passive infrared detectors.

The advantages of these forms of detection provide the end user with far more time to react to a situation. It at the same time prevents the would-be intruder from continuing any further.

Active outdoor beams

Optex offers a range of high quality outdoor detectors with a 5-year guarantee, including against lightning. They are available in ranges from 20 to 200 m in the outdoor version. The indoor ranges are from 20 to 400 m. To add to all the above, some of the features are, the ability for a 99% reduction in signal without creating a false alarm. Channel selection to prevent cross talking when stacking.

Professional security installers have also welcomed an additional detector to the Optex BX range of outdoor detectors. The BX80N creates a 24 m narrow detection area and can be installed along banks of windows or doors. The BX80N is convenient and simple to install, and is mounted in the centre of the detection area and protects 12 m either side. Since there is no need to align transmitters and receivers, one person can install the BX80N quickly and easily.

Infrared barriers

The AlarmCom IS402 is an outdoor passive infrared detector that creates a 100 m impenetrable barrier that can be used in intrusion detection systems to monitor the perimeter of large areas, or as a motion detector to activate CCTV surveillance systems.

The robust design of the IS402 makes it easy to install, and because it utilises passive infrared technology there is no need to run cables to a transmitter. Stability and high levels of catch performance are governed by the use of precision mirror optics, selectable differential signal processing and Adaptive Threshold Decoding (ATD), which adjusts and monitors the sensitivity of the detector when environmental changes take place.

The IS402 is suitable for large, fenced off, areas, monitoring of doors and windows on industrial facilities or where it is impossible to run cabling for active beam installations.





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