Loma IQ2 User Manual page 134

117
Installing the metal
detector
paging aerials and loops, RF heaters, welders of all types and even airport radar. The only
cure is to re-orientate either detector head or the source of interference so that the aperture
is not looking directly at it.
Post-installation problems
Commissioning procedures are covered comprehensively in Service Bulletin MD20. Copies
are available on request.
Spurious triggering
Moving metal anywhere within the metal free area up to a distance of twice the smaller of the
aperture dimensions away from the head can be detected.
Examples of moving metal include:
• Operator rings or watches
• Belt contamination even by small particles of rust
• Metallic belt clips even if plastic coated
• Metallic guide rails particularly into the metal free area
• Loose infeed decking
• A conveyor bolted together rather than welded
• Metallic inks or labels
• Metallic frames to infeed or outfeed guards
• Low grade or reclaimed cardboard packing materials which often contain metallised paper
or foil
• Washers or swarf under the skid plate.
Other causes, include:
• Excessive vibration, particularly when run in reactive mode
• Eddy current loops
• Aperture pressure
• Electrical Interference and EMC considerations.
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