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About EAS

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EAS stands for Electronic Article Surveillance and is a technology used to identify articles as they pass through a gated area in a store. This identification is used to alert someone that unauthorized removal of items is being attempted.
  Estimations are made that there are almost 800 000 EAS systems installed over the world, primarily in the retail arena. Using an EAS system enables the retailer to display popular items on the floor. The use of EAS systems does not completely eliminate shoplifting. But experts say that theft can be reduced by 60 % or more when a reliable system is used. Considering that store personnel will have more time assisting shoppers a reliable EAS system can pay for itself in 1-2 years.
  The type of EAS system dictates how wide the exit/entrance aisle may be, and the physics of a particular EAS alarm tag and technology determines which frequency range is used to create a surveillance area. EAS systems range from very low frequencies through the radio frequency range. The different EAS systems operate on different principles, are not compatible and all have their benefits and disadvantages.
  The three most widely used EAS systems are RF,
EM and AM.


RF Radio Frequency (RF) Systems works like this:

A label- basically a miniature, disposable electronic circuit and antenna- attached to a product or Safer responds to a specific frequency emitted by a transmitter antenna usually one pedestal of the gates near the door. The response from the label is then picked up by an adjacent receiver antenna for instance the other antenna. This processes the label response signal and will trigger an alarm when it matches specific criteria.


EM Electromagnetic (EM) system works like this:

A magnetic, iron-containing strip with an adhesive layer is attached to the merchandise. This strip is a metal wire or ribbon that has high permeability, making it easy for magnetic signals to flow through it. The strip is not removed at checkout. It is deactivated by a scanner that uses a specific highly intense magnetic field.


AM Acousto-magnetic (AM) system works like this:

A transmitter creates a surveillance area where tags and labels are detected. The transmitter sends a radio frequency signal in pulses, which energize a tag in the surveillance zone. When the pulse ends, the tag responds, emitting a single frequency signal. While the transmitter is off between pulses, the tags signal is detected by a receiver. A microcomputer checks the tag signal detected by the receiver to ensure it is at the right frequency, is time-synchronized to the transmitter, at the proper level and at the correct repetition rate. If all these criteria are met, the alarm occurs. When the AM tag is demagnetized, it is deactivated. When it is magnetized, it is activated. This is the opposite of how the deactivation of EM tags works




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