Article surveillance system

A goods security system is the term used to describe facilities in shops to secure goods or to prevent theft . Goods are equipped with special article security labels , which either remain on the product and, if the deactivation is bypassed at the cash register, by detection devices such. B. can be recognized at the exit, or are attached to the goods in such a way that special solution devices are required for removal. In the first case, the "silent" or "loud" alarm triggered should expose the thief in the shop. In the second case, the label is intended to be a deterrent, as the thief can expect damage to the goods during improvised removal.

According to the retail trade , the installation of article surveillance systems can reduce inventory differences between 30 and 70 percent. The damage caused by theft in retail in Germany is given as three to five billion euros per year.

Working methods are electromagnetic or radio frequency with a frequency of 2.2 to around 2.5 MHz. The strip-shaped labels can be made up of 2 to 3 magnetizable foils and intermediate layer (s), which can be deactivated or reactivated on a magnetic plate. More square labels are of a different type and contain a "printed" coil , i.e. a flat spiral of thin aluminum foil and an overlying connection of the spiral ends with a capacitor that is also printed . The result is an oscillating circuit with a certain resonance frequency . If this is placed near transmitter coils that are built into the plates on the right and left of the shop exit, it will start to resonate. This removes energy from the transmitter coils, whereupon the evaluating electronics respond and trigger the alarm.

Article surveillance system

See also