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x1.5x2 x1.5 x2

AB Metal

Free Zones

Fixed Metal Free ZoneGenerally, the practical size of the metal free zone is 1.5 times the (smaller) aperture dimension, and no metal should be allowed in the area

A x 1.5

A x 2 Moving Metal Free ZoneMoving metal should be kept 2 times away

Metal Detector Aperture This is the area inside of the metal detector’s enclosure that detects metal. There is a field that emanates out both sides that forms the metal free zone

Smallest Dimension

A =