Metal Detector Features and Concepts
The safety and reliability of the metal detector depends on the stability of the frequency of the electromagnetic transmitter, generally using the operating frequency from 80 to 800kHz. The lower the working frequency, the better the detection performance of iron; the higher the working frequency, the better the detection performance of high carbon steel. The sensitivity of the detector decreases with the increase of the detection range, and the size of the induction signal depends on the size and conductivity of the metal particles.
Due to current pulsation and current filtering, metal detectors have certain limitations on the conveying speed of detected items. If the delivery speed exceeds a reasonable range, the sensitivity of the detector will drop.
In order to ensure that the sensitivity does not drop, the appropriate metal detector must be selected to adapt to the corresponding detected product. Generally speaking, the detection range should be controlled to the minimum value as much as possible. For products with good high-frequency sensitivity, the size of the detector channel should match the product size. The adjustment of the detection sensitivity shall be determined with reference to the center of the detection coil, which has the lowest induction. The detection value of the product will change with the change of production conditions, such as changes in temperature, product size, humidity, etc., which can be adjusted and compensated through the control function
Balls are repeatable, have the smallest surface area, and are the most difficult for metal detectors to detect. Therefore, the spheroid can be used as a reference sample for detection sensitivity. For non-spherical metals, the detection sensitivity largely depends on the position of the metal. Different positions have different cross-sectional areas, and the detection effect is also different. For example, when passing longitudinally, iron is more sensitive; while high carbon steel and non-ferrous are less sensitive. When passing horizontally, iron is less sensitive, while high carbon steel and non-ferrous are more sensitive.
In the food industry, systems often use higher operating frequencies. For foods such as cheese, due to its inherent high-frequency induction performance, it will increase the response of high-frequency signals proportionally. Moist fatty or salty substances, such as bread, cheese, sausage, etc. have the same conductivity as metals. In this case, in order to prevent the system from giving false signals, the compensation signal must be adjusted to reduce the sensing sensitivity.
Metal detector function to divide:
1) Full metal detector: It can detect all metals such as iron, stainless steel, copper, aluminum, etc. The detection accuracy and sensitivity are relatively high, stable and reliable.
2) Ferrous metal detector: It can only detect ferrous metal, commonly known as needle detector. The detection accuracy and sensitivity are low, and it is easy to interfere.
3) Aluminum foil metal detector: It can only detect ferrous metals, but when detecting products with aluminum foil packaging, its detection accuracy and sensitivity are still high.
It is made with advanced technology, and it has the characteristics of wide detection, accurate positioning, strong resolution and easy operation. Metal detectors are mainly used to detect and identify metal objects buried underground. In addition to its application in the Internet, it is also widely used in: security inspection, archaeology, prospecting, looking for scrap metal. And
Said "iron detector" is a good helper for waste recycling.
Underground metal detectors use sound alarm and instrument display. The detection depth has a great relationship with the area, shape and weight of the metal to be detected. Generally speaking, the larger the area, the greater the number, and the greater the corresponding detection depth; Conversely, the smaller the area, the smaller the number, and the smaller the corresponding depth. The maximum detection depth listed in the table below is the result of actual measurement by embedding a 60cm*60cm*0.5cm aluminum plate in dry soil according to the enterprise standard of the product
The main function
Equipped with a ground balance line, which can eliminate the impact of "mineralization reaction", greatly improving the depth and accuracy of effective detection;
It has the function of distinguishing ferrous metals and non-ferrous metals;
Using intelligent operating system;
Packaged with high-strength ABC material, light in weight and long in life;
Metallic sounds can be identified through headphones.
Metals are buried underground and detected through thick soil layers, which must be affected by geological structures. There are various minerals in the strata, and they will also generate signals for metal detection. The signals of enough minerals will cover up the signals of metals and cause false appearances. People who have used old-fashioned metal detectors have this experience. As the probe approaches mounds, stones, and bricks, an alarm will sound. This phenomenon is called "mineralization reaction." For this reason, old-fashioned metal detectors can only detect metals in shallow soil, and are powerless to metal targets buried deep underground. Inugami underground metal detector is equipped with advanced ground balance system, which can eliminate the interference of "mineralization reaction", greatly improving the detection depth and effect of the instrument.
