The introduction of sensitivity related knowledge of walk through metal detector gate

- Nov 25, 2019-

The sensitivity of walk through metal detector gate refers to the parameter of the size of the metal object that generates the alarm. The higher the sensitivity of the door frame metal detector, the smaller the volume of the metal object that can be detected. The discrimination of detection, inspection and identification ability, and the alarm rate of the walk through metal detector gate at the security check point can indicate the identification ability of the equipment. Recognition force is affected by many factors, such as sensitivity level, personnel appearance and climate temperature.

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Alarm rate refers to the number of alarms caused by metal objects, which accounts for the percentage of the number of people passing the door frame metal detector. The alarm rate will be affected by the recognition force. If the recognition ability is poor, the alarm rate will be higher. Alarms caused by electronic interference or other reasons other than the items carried through the walk through metal detector do not include the range of alarm rate. The number of people allowed to pass through the walk through metal detector gate in a given time without affecting the detection performance of the walk through gate.


The passing rate indicates the ability to restore the standby status of the door frame metal detector after the personnel passes. In the actual operation, the passing rate is only theoretical due to the influence of the inspection procedure and the walking speed of the personnel.


The operating frequency of the walk through security gate is the frequency of the electromagnetic field. Usually, the walk through metal detector gate has many different frequencies to choose from. Operation frequency with interference level is usually selected when field installation calibration is used. By using multiple operation frequencies, multiple walk through gates can be operated side by side without using synchronous cables.