1. Impact of product composition: metal detector mainly detects metal according to the conductivity of the article. Therefore, the less water or salt the product contains, the lower the conductivity, the less impact the product has on the metal detector, and the easier it is to detect small metal foreign matters. For example, biscuits, bread and other products contain less water and salt, and the detection accuracy is high; Raw meat, pickles and other products contain more water and salt, and the detection accuracy is relatively weak.
2. Impact of product temperature and humidity: The lower the product temperature is, the better the accuracy will be. The easier it is to detect small metal foreign matters. The detection accuracy of completely frozen products is higher, and the detection accuracy of semi thawed products, cold storage products, and high-temperature products will gradually decrease. Therefore, if conditions permit, it is better to test in the fully frozen state of the product. When setting the parameters of the metal detector, the temperature of the product should be kept consistent with the temperature of the actual production detection, so that the set parameters can be accurate, otherwise it may cause false alarm of the equipment.
3. Type of metal: Magnetic metal and metal with low inherent resistance value are relatively easy to detect, such as iron, cobalt, nickel, etc. On the contrary, it is not easy to detect, such as lead, copper, stainless steel, etc. This is why we use Fe and stainless steel test cards to detect whether the metal detector is normal.
4. Size and shape of metal: The same metal with large volume is relatively easy to detect, while the sphere is the least easy to detect. The needle wire shape and cylindrical metal foreign matters have different detection effects when passing through the detector in different directions. Therefore, the test card of the metal detector is based on the spherical metal.
5. Speed of production line: crowding degree of production line and speed of conveyor belt. The impact of a single product on the equipment is small. If it is stacked to a certain amount, the impact will gradually increase. Therefore, the more products passing through the metal detector head at the same time, the weaker the detection effect; The slower or faster the conveyor belt is, the weaker the detection effect will be. The best detection speed is generally 20-30 m/min
6. Type of conveyor belt: the tightness and cleanliness of the conveyor belt. It is necessary to ensure the proper tightness and cleanliness of the conveyor belt!