Industrial Metal Detector FAQ’s
1) What is the difference between wet and dry
products?
Products that the metal detector recognizes as Dry (non-conductive) do not normally have any product effect and therefore would only require set-up/calibration only one time. The expected sensitivities are: whatever the Ferrous standard is the Non-Ferrous standard will be the approximately the same size, and the Stainless Steel standard will be approximately one and a half times as big.
Products that the metal detector recognizes as Wet (conductive) do have product effect which has to be compensated for, to allow the best possible metal detection to be obtained.
The size of metal to be detected is determined by the amount of product effect caused by the product, and the expected sensitivities are: whatever the Ferrous standard is the Non-Ferrous standard will be approximately one and a half times as big, and the Stainless Steel standard will be approximately twice as big.
Products that the metal detector recognizes as Dry (non-conductive) do not normally have any product effect and therefore would only require set-up/calibration only one time. The expected sensitivities are: whatever the Ferrous standard is the Non-Ferrous standard will be the approximately the same size, and the Stainless Steel standard will be approximately one and a half times as big.
Products that the metal detector recognizes as Wet (conductive) do have product effect which has to be compensated for, to allow the best possible metal detection to be obtained.
The size of metal to be detected is determined by the amount of product effect caused by the product, and the expected sensitivities are: whatever the Ferrous standard is the Non-Ferrous standard will be approximately one and a half times as big, and the Stainless Steel standard will be approximately twice as big.
2) What is Product Effect?
Product Effects are the Electrical properties of your product; these are based on mass, density, temperature, conductance, and resistance just to name a few.
3) Why does a metal detector, on
certain products, require frequent calibration / learn procedures?Product Effects are the Electrical properties of your product; these are based on mass, density, temperature, conductance, and resistance just to name a few.
These
procedures are normally associated with what is termed wet / moist / reactive
products.
These particular products can have a varying temperature / moisture / ingredient content which will create a different product effect than the original settings did.
To maintain the metal sensitivity specification a fresh calibration / learn procedure may be required to allow for this change and compensate for the change in product effect.
4) Is it possible to use one program
for all products?These particular products can have a varying temperature / moisture / ingredient content which will create a different product effect than the original settings did.
To maintain the metal sensitivity specification a fresh calibration / learn procedure may be required to allow for this change and compensate for the change in product effect.
Yes, provided the products are similar. All dry products can normally use one program.
Reactive / moist / wet products can also use one program provided the products are of a similar type and you have set up the metal detector for the largest size.
5) Why won’t my metal detector calibrate / set-up for
my Wet product?
If the product is small compared to the aperture size it will not create a large enough product effect to be accurately recognized, try bunching up multiple products to create a larger product effect.
If the product is small compared to the aperture size it will not create a large enough product effect to be accurately recognized, try bunching up multiple products to create a larger product effect.
6) Why occasionally does the metal detector not detect
the required size of metal usually non-ferrous or stainless steel?
If the metal size to be detected is small and the product is wet/ reactive, it's possible the product effect is creating an amount of interference as great as the metal test sample does. A fresh calibration / learn might resolve this, or on a longer term, a more realistic metal size should be determined.
If the metal size to be detected is small and the product is wet/ reactive, it's possible the product effect is creating an amount of interference as great as the metal test sample does. A fresh calibration / learn might resolve this, or on a longer term, a more realistic metal size should be determined.
7) Why does
the metal detector reject more than one pack on occasions?
This is usually associated with the product packs being too close together, was the metal in the back of the first package or the front of the second package?
Try to avoid having two packs within the search head at the same time.
A product registration photocell can minimize this effect.
This is usually associated with the product packs being too close together, was the metal in the back of the first package or the front of the second package?
Try to avoid having two packs within the search head at the same time.
A product registration photocell can minimize this effect.
8) The metal detector has lots of rejects (suspected
false rejects).
ARE THEY REALLY
FALSE REJECTS OR DO YOU HAVE VERY SMALL CONTAMINANTS?
Has product changed? Defrosted, heated up, spicier or totally different product. Try re-calibrating with the current product.
Is the belt clean? Check belt with no product running for large signals, either clean or change belt.
Has product changed? Defrosted, heated up, spicier or totally different product. Try re-calibrating with the current product.
Is the belt clean? Check belt with no product running for large signals, either clean or change belt.
