Generally used from 80to800kHz operating frequency. The lower the operating frequency, the accuracy and reliability of the metal detector depends on the stability of the electromagnetic transmitter frequency. The better the detection performance of iron; the higher the operating frequency, the better the detection performance of high carbon steel. The sensitivity of the detector decreases as the detection range increases, and the magnitude of the induced signal depends on the size and conductivity of the metal particles. Due to the pulsation of the current and the current filtering, the metal detector has a certain limit on the conveying speed of the detected articles. If the delivery 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 a suitable metal detector to accommodate the corresponding product to be tested. In general, the detection range is as small as possible in the zui value. For products with high frequency induction, the detector channel size should match the product size. The adjustment of the detection sensitivity is determined by referring to the center of the detection coil, and the sense of the center position is low. The detection value of the product will change with the change of production conditions. For example, the change of temperature, product size, humidity, etc. can be adjusted by the control function to make up for the repeatability of the ball, and the small external product of the Zui is also for the metal detector. Zui is difficult to detect. Therefore, the ball can be used as a reference sample for detection sensitivity. For non-spherical metals, the detection sensitivity depends largely on the position of the metal. Different positions have different cross-sectional areas, and the detection effect is different. For example, when passing vertically, iron is more sensitive; while high carbon steel and non-ferrous are less sensitive. When passing horizontally, iron is less sensitive, and high carbon steel and non-ferrous are more sensitive. In the food industry, systems typically use higher operating frequencies. For foods such as cheese, the high frequency signal response is proportionally increased due to its inherent high frequency sensing performance. Wetting fats or salt substances, such as bread, cheese, sausages, etc., have the same electrical conductivity as metals. In this case, in order to prevent the system from giving an error signal, it is necessary to adjust the compensation signal and reduce the sensitivity.

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