Likewise, the cross-members of the conveyor framework represent possible break points. Over
time, these connections can work loose or corrode and cause “make and break” connections
due to vibration. The interruption or change of the current is a source of electromagnetic
interference detectable by the metal detector.
Figure 3
Potential Sources for
“Make and Break”
connections
Metal
Detector
Head
Pulley
Tail
Pulley
Electromagnetic
Field
Bearings
Return
Idler
Welded Frame Cross
Member
Induced/Ground Current
Paths
INSULATING CONVEYOR SHAFTS
A continuous electrical path through pulleys and idlers cannot be assured. As a result, current
changes cannot be prevented in these components. They must be electrically isolated from the
rest of the system by introducing an isolating medium into the conductive path. There are three
common methods to accomplish this task.
MECH
16
Summary of Contents for Xtreme
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