The use of metal detection machine is very extensive, the detection standards of different industries are not the same, especially the food metal industry, a wide variety of food, unsuitable metal detection machine may make the product safety problems, then how to choose the right metal detection machine.
Product effect is an important factor affecting the detection accuracy of food metal detector. Different products have different product effects. There are many subcategories in the food industry. From the point of view of product status, there are generally dry products and wet products :
Dry products are easy to detect in the absence of water quality. When selecting a device type, use a conventional product. Select the corresponding machine model according to the shape of the product. In general, foods packaged in small bags, such as bread, cookies, and candy, can be used with portable metal detectors in conjunction with assembly lines. Placed at the end of the production process, after passing the inspection directly into the warehouse.
For dry granular and powdery products, it is necessary to choose a blanking metal separator, through an automatic separation device to separate the matching product from the unqualified product. The falling metal detector has a small opening and a higher detection sensitivity than the conveying type.
Wet products are more difficult to detect than dry products. Wet products contain water. One of the properties of water is its electrical conductivity. In the case of wet products formed in packaging, there will be salt and sugar issues. All of these factors affect detection, which we call the "product effect." Therefore, if you are a company that produces wet products, when choosing a food metal detector, you should choose a machine with waterproof body and strong anti-interference performance.
But there is also a class of wet products that belong to pure liquid, paste and paste products. For this type of product, a tubular metal detector should be selected and a pump is used to provide pressure to drive the product through the inspection. When testing pure liquid products, the pump pressure parameter should be set, because the detection speed should be consistent with the reaction time of the detection probe. If bubbles form in the paste and paste products during the inspection process, the detector is difficult to distinguish, and it is easy to produce false positives.
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