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Setting the right metal detector frequency helps you get clear and accurate results. But frequency is not the only thing that matters. Many small things can change how well your detector works. Here are seven simple tips to help you get better performance.
Every product gives off a small signal. This is normal.
Dry foods like pasta or snacks give off a light signal. Wet foods like dairy or ready meals give off a stronger signal, which can cause false rejects.
Tip: Run your product through the detector. Raise the frequency slowly until it starts to reject good product. This shows you the product’s natural signal.
Not all metals act the same. Some are easier for the detector to pick up.
Tip: Keep test pieces for three types of metal: ferrous, non‑ferrous, and stainless steel. Test often to make sure your settings stay right.
The angle of the metal object can change whether the detector sees it. If only a small part of the metal faces the detector, it may not be detected.
Tip: Test using the hardest angle — the angle where the least metal is facing the detector.
A large opening gives you more room, but it also makes the detector less sensitive. Metal closer to the wall is easier to detect than metal in the centre.
Tip: Place test pieces in the centre when checking your detector. This is the hardest point for the machine to detect metal.
Some packaging includes metal, like foil trays or foil‑backed labels. These can create false alarms or reduce sensitivity.
Tip: Most packaging metal is non‑ferrous. Use tools made from other metal types to help avoid false rejects.
Metal detectors work best when products move at a steady speed. Sudden changes can affect results.
Tip: Try to keep product flow smooth and even for the best performance.
Changes in temperature, vibrations, and electrical noise can affect the detector, especially at high frequencies.
Tip: Do not worry too much about this. The other six factors usually have a bigger effect.
Choosing the Right Detector
Dry foods often work best with high‑frequency detectors. Wet or hot foods do better with detectors that reduce strong signals or use more than one frequency.
