Because of the pulsation of current and the reason of current filtering,industrial metal detectors have certain restrictions on the speed of detecting objects. If the conveying speed exceeds a reasonable range, the sensitivity of the detector will decrease.
In order to ensure that the sensitivity does not decrease, it is necessary to select suitable industrial metal detectors to suit the corresponding detected products. Generally speaking, the detection range is controlled as minimum as possible. For high frequency induction products, the size of the detector channel should match the product size. The sensitivity of the detection should be determined by reference to the center of the detection coil. The detection value of the product will change with the change of production conditions, such as temperature, product size and humidity. It can be adjusted through the control function.
Spheroids are repeatable, and the smallest surface area is the most difficult to detect for metal detectors. Therefore, the sphere can be used as a reference sample for detecting sensitivity. For non spherical metals, the detection sensitivity depends largely on the position of the metal. There are different cross-sectional areas in different positions, and the detection results are different. For example, when passing longitudinally, iron is more sensitive, while high carbon steel and non-ferrous metals are less sensitive. When passing horizontally, iron is not very sensitive, and high carbon steel and non iron are more sensitive.
In the food industry, the system usually uses a higher working frequency. For cheese foods, the high frequency response will be increased proportionally because of its inherent high frequency induction. Moisture or salt substances, such as bread, cheese and sausage, are the same as those of the metal. In this case, in order to prevent the system from giving false signals, the compensation signal must be adjusted to reduce the sensitivity of the induction.