Perimeter Protection >> SICURIT - ITALY

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ABSOLUTE

Absolute is a dual-technology detection system for outdoor installation, enclosed in two columns made of aluminum extruded. Its ideal application is for the protection of large civil, commercial or military areas, in which a high degree of security is required. This completely new combination of outdoor detectors allows perimeter protection with coverage of up to 150 m. Microwave technology, combined with infrared  sensors, reduces considerably the possibility of false alarms while maintaining high security standards.

NO MORE FALSE ALARMS

False alarms are often caused by external, atmospherically conditions, or by the movements of animals. The most frequent causes, as far as atmospherically conditions are concerned, are due to wind that causes movements of objects like pages of newspaper or plastic bags, which may interrupt the infrared beam. As far as animals are concerned, the most frequent causes are due to the movements of stray dogs and cats or other wild animals, which can easily interrupt the infrared beams, especially those installed about 40 to 50 cm above the ground. Other causes of interruption of the beams installed at the top may be birds, which happens very frequently in open-field installations.

OPERATION

The microwave and active infrared signals are received and processed individually: the activation of the alarm signal comes as a result of precise synchronisms and a sophisticated coordination between the two technologies. Surveillance is carried out by means of a temporary window memory circuit. The pilot circuits of both detection technologies are equipped with a timer whose range is from 20 seconds to 2 minutes. The first device that receives a stimulus activates its own timer. During this time the other technology will be summoned to confirm the final alarm. Through this method of operation, false alarms caused by  environmental factors are eliminated.