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Inspection and Testing

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Inspection and Testing Components
Magnet Pull test kit
       Gauss meter                                                                                             Pull Test Kit
A)  Cracked welds or damaged components resulting from excessive vibration or
       physical abuse.
B)  Worn components from abrasive products or extended use.
A)  Gauss readings using a gaussmeter.  Gaussmeters measure the number of lines of flux
       in a magnetic field.  This is an accurate measurement of the magnetic field but is an
       expensive piece of equipment.  One of the drawbacks is that the sensitivity of the
       gauss-meter will produce different results with the slightest movement.  When
       monitoring  the performance of a magnetic separator over a period of time, accurate
       comparisons will be very difficult.
B)  Pull tests are the most common method.  This requires a pull test scale ( spring
      loaded scale graduated in ounces or pounds ) and various test fixtures.  When
      comparing test results, whether between different magnet manufacturers or an
      in-house scheduled audit, it is imperative that the same procedure and apparatus
      are used in each test.  If a smaller ferrous test fixture is used than what was used in   
      the previous test, the results will differ greatly.  The reason for this is the larger the
      ferrous test fixture, more of the magnetic field will be absorbed, therefore,
      producing higher test results.
      Pull tests produce two end results- pulling power and holding power.  Both of these
      results are of equal importance.  Pulling power relates to the "reachout" of the
      magnetic field.  Depending on the application, a magnet that has the power to draw
      ferrous contaminants out of a product stream should have the ability to retain that
      ferrous contaminant.  Therefore in comparison the reachout would be more critical
      than the holding power.  Plate magnets typically fall into this category.
      Holding power relates to the breakaway force required to remove the ferrous test
      fixture from the working surface of the magnet.  Grates and drawer type magnets
      typically have 1" diameter magnetic tubes  mounted on 2" centers.  Quite often there
      are two or more rows of staggered tubes.  While reachout is still important, it is more
      critical to the performance of the separator that it have the maximum achievable
      holding power.  The staggered configuration of the magnetic tubes causes the product
      to cascade over one row of tubes and fall directly below on top of the following row
      of tubes.  This ensures the weakly magnetic particles will be captured and retained
      and not return to the cleaned product.

Download Equipment and Procedure For On-Site Inspection and Testing of Separation Equipment
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