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How To Detect 87 Percent Smaller Wire Contaminants In Manufacturing

How To Detect 87 Percent Smaller Wire Contaminants In Manufacturing

Profile Advantage enhances metal detection performance by up to 50 percent in challenging product effect applications. This sensitivity improvement means significantly smaller pieces of metal contamination can be found.  

How Metal Detector Sensitivity is Measured
Metal detector sensitivity performance is usually expressed in terms of the diameter of a test sphere made from a specific type of metal, such as ferrous, non-ferrous, aluminum or stainless steel. This test piece must be reliably detectable when passed through the center of the aperture of the metal detector. However, there is a significant difference between the test piece's spherical sensitivity and the actual length of wire that can be detected due to the metal contamination's 'orientation effect.'

Orientation effect means certain types of metal are easier to detect when passing through the metal detector's aperture in a particular orientation, compared to other orientations. Ferrous contaminants are easier to detect when they are presented parallel to the direction of travel (A), and are more difficult to detect when they are at 90° to the direction of flow (B). Non-ferrous and stainless steel metals have the opposite effect.

However, orientation effect is only evident when the diameter of the wire contaminant is less than the spherical sensitivity of the metal detector. The type of metal as well as the diameter of the wire contaminant has a significant impact on the length of wire that can be detected.

How Test Ball Size Relates to Actual Physical Metal Contaminants
The type of metal as well as the diameter of the wire has a significant impact on the length of wire that can be detected. The data in the table shows reducing the size of the test sphere that can be detected significantly decreases the minimum length of wire contaminant that can be detected. It clearly shows why users should seek to achieve the highest on-line sensitivity possible from their equipment suppliers.

Ferrous Spherical Sensitivity

Steel Paper Clip Dia 0.95mm (0.0037")

Tinned Copper Wire Dia 0.91mm (0.036")

Copper Wire Dia 1.37mm (0.056")

Stainless Steel Wire - EN58 Dia 1.6mm (0.063")

2.5mm

11.0mm long

55.0mm long

18.0mm long

64.0mm long

2.0mm

6.0mm long

26.0mm long

8.0mm long

24.0mm long

1.5mm

3.0mm long

9.0mm long

3.0mm long

8.0mm long

The data in the table shows reducing the size of the test sphere that can be detected significantly decreases the minimum length of wire that can be detected. Conversely, decreasing the sensitivity means larger pieces of metal will go undetected, increasing the risk of metal contamination reaching the consumer.

Choosing a stable, reliable metal detector that delivers enhanced sensitivity levels is an integral part of your food safety programme to minimize metal contamination. In challenging applications where products are hot, wet, chilled or cooling, Profile Advantage delivers up to 50 percent improved sensitivity. This means you can find smaller metal contaminants, enhancing the quality of your products and protecting your brand reputation.