Common Problems with Metal Detection

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Nov 21, 2013

When it comes to metal detectors, one of the most common problems is practical and consistent testing of the equipment following installation.  Sometimes, people think they can set it up and then expect all things to remain the same.  Everything should be included in a frequent operational inspect-and-check program.

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Sometimes product changes will introduce sensitivity issues where none previously existed.  For example, there is a big difference in checking between frozen, wet, or dry materials.

Just as with a scale, the smaller the capacity, the greater the accuracy.   In the case of metal detectors, this translates to the size of the aperture which the product must go through.  The product’s electrical and magnetic characteristics change according to product makeup as well.  When product makeup changes, a metal detector should be rephrased or retuned after the fact.  Depending on the size and characteristics of the aperture and possible metal contaminants, metal may or may not be detected accordingly.

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A metal detector implemented in one area may be inappropriate for use in another, as indicated above.  Just because an item’s size will allow passage, does not ensure credibility for accurate detection of metal contamination.  Simply put, you must have the right tool or setup for the right job.  Thus, it’s a good idea to check with your vendors as you make changes to your operations.

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Sometimes, problems are introduced from the actions of overly aggressive cleaning crews.  With this in mind, you should realize the need for consistent and frequent operational checks and tuning as may be necessary.

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