X-ray Contaminant Types Photo
X-ray Contaminant Types
November 1, 2021
Bell's Metal Detector
Invention of Metal Detectors
January 1, 2022
X-ray Contaminant Types Photo
X-ray Contaminant Types
November 1, 2021
Bell's Metal Detector
Invention of Metal Detectors
January 1, 2022


Best Practices - Metal Detection



When it comes to metal detection protocols and practices, you need to define every step. It’s the only way to ensure the safe product will get to a customer’s table. And it has to be safe for consumption or it’s just plain negligent. The customer has to come first. There’s no shortcut to integrity. Here’s a list of Best Practices and Typical Guidelines for handling your metal detector systems:


  • Supply training for maintenance and cleaning staff in metal detector basics.
  • Plan and control your maintenance schedule, ideally during non-production hours.
  • Plan regular inspection of your production lines for identification of potential contaminants.  Pay particular attention to Critical Control Points (CCP).
  • Utilize good housekeeping practices throughout the plant.
  • Identify your “standards.” You need to know what you can achieve and how to get the most out of your detectors.
  • Re-evaluate standards whenever the conditions change whether in supplier controls or changes in product or on the line.
  • Maintain and safely store all documentation and records. If you don’t know where you’ve been you’ll never advance.
  • Maximize sensitivity without compromising performance. Implement security levels, protocols and passwords.  Ensure that only qualified personnel have access to secure information.
  • Document and communicate all testing. Identify how tests are performed, who is responsible and why.
  • Always use certified metal detection test pieces from a reliable source.  Use an ISO certified source.
  • Establish the frequency for testing and maintain it. Ensure that all responsible parties understand the need for integrity in test and are held accountable.
  • Create test packs where relevant and appropriate.
Reject Product Handling
  • Isolate and re-screen potentially contaminated product on test failure. Never let product with suspected contaminant leave the plant.
  • Investigate the source of the contaminant. Use trained personnel, offline and as quickly as possible or within reasonable time
  • On repeat (consecutive) detection issues, identify the source of the contaminant.
  • On multiple detections, stop production.
Record Keeping
  • Record commissioning and sensitivity details.
  • Store test results where qualified quality control personnel can access.
  • Keep shift results, including the number of rejects and action taken.
  • Document maintenance schedules and who performed the procedures.
  • Maintain training documentation for all personnel.


  1. tputman says:

    How can I store and clean my test pieces?

    • brian says:

      That’s a very good question. While our acetal (plastic) test pieces are chemically resistant, we recommend using an ordinary detergent and/or isopropyl alcohol. Cleaners like Simple Green, Formula 49 and Clorox disinfecting wipes are suitable as well. Laminate test pieces are more likely to degrade in wet environments, but they can also be washed and dried with the same cleaners. We do not recommend soaking test pieces (especially laminate cards), and they should always be dried after cleaning. Given that all plastics have a heat tolerance limit, we also do not recommend heating the test pieces in any manner. If they need to be scrubbed where there is product stuck, rubbing with a clean cloth should be sufficient. Abrasives, however light, should be avoided. Test pieces can be stored in any clean and dry environment. We have a variety of cases available and can also customize cases to your specific needs. Our 5inch and 6inch testrods fit nicely in our nylon cases and other types are very well suited for our hard cases. See our article on “Cleaning Test Pieces” for more information. If you have an account on our website you can download formal documentation in the certificate section.

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