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This guide explains the concept of metal detector sensitivity and the key factors that influence it. Guidance is provided to explain why a small difference in spherical sensitivity performance can mean a big difference in the length of wires or other irregular-shaped contaminants that can be detected. It also highlights when you should test your metal detector sensitivity to ensure the system is performing as it should. The guide concludes with a brief overview of the difference between validation, verification and routine performance monitoring.
There are a number of factors that affect the sensitivity of a metal detector and the ability to find different types of metal. Each of these is discussed in detail in the guide. It’s important to understand these factors to get the most out of your metal detection program.
Understanding sensitivity can also assist you in making a decision about installing a new metal detector, when comparing different metal detection systems. A difference in spherical sensitivity of 0.2-0.5mm may not sound like a lot. However, when you equate this to the capability of each system to detect non-spherical or irregular-shaped contaminants, the difference can be significant.
Understanding sensitivity standards – for comparison purposes
When comparing the performance of different metal detectors, you can examine the individual sensitivity for specific types of metal.
In some cases, the clear winner is the metal detector with the best spherical sensitivity across all metal types, when measured in the center of the aperture. However, in other cases, it may not be so clear, with one detector outperforming the other on one metal type, and vice versa for another.
When there is no clear winner at first glance, it may be better to use the ‘mean sensitivity’ performance measure. Download our guide to understanding sensitivity for more details on this approach.
Minimize your risk of product recalls due to metal contamination
It is important that your metal detector delivers the highest possibility sensitivity. However, equally as important is the stability and reliability of the system to avoid false rejects and unnecessary product waste.
Orientation effect and product effect need to be understood and addressed where applicable to ensure you maximize the performance of your metal detection program.
If you want to improve your knowledge of metal detection technology, download our guide to Understanding Sensitivity Principles for Industrial Metal Detectors today.
