Material on the conveyor passes underneath the overband magnet. Ferrous metal is attracted to its surface allowing the ‘cleaned’ product to continue along the conveyor as normal. The overband magnet has a continuously moving belt which wipes its surface clean of the ferrous metal attracted to it. The ferrous metal then discharges away form the overband as shown below.
There are two possible positions for the overband magnet
Crossbelt – which tends to be the most common: The overband is suspended across the conveyor as shown below. Ferrous metal is extracted and discharges to the side of the conveyor.
In-line over the head pulley – The overband is positioned over the head pulley of the conveyor (must benon-magnetic) and runs in the same direction as the conveyor. Ferrous metal is extracted and discharged further forwards than the normal trajectory of the conveyor.