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When winding the coil, leave a sufficient length of wire to connect to the loop inductor and ensure there is no connector in the middle. After winding the coiled cable, the outgoing cable must be made in a tightly twisted form, requiring a twist of at least 1 m 20 times. Otherwise, untwisted output leads will pull in, making the coil inductance unstable. The output lead length should generally not exceed 5 meters. Since the sensitivity of the detection coil decreases as the length of the lead increases, the length of the lead cable must be as short as possible.
The coil is first embedded in a slot cutter on the road. Perform 45-degree chamfering on the four corners to prevent sharp corners from damaging the coil cable. Groove width is generally 4 to 8 mm and depth 30 to 50 mm. At the same time, a slit for the coil lead to the curb must also be cut. However, it should be noted that the grooves must be clean and free of water or other liquids. The coil must be straightened when it is wound, but do not stretch too tightly and close to the bottom of the groove. After winding the coil, the twisted output lead is led out through the lead slot. During winding of the coil, an inductance tester should be used to actually measure the inductance of the inductor and ensure that the inductance of the coil is between 100uH and 300uH. Otherwise, adjust the number of turns of the coil.
In order to make the detector work, the inductance of the coil should be kept between 100uH-300uH. With the coil inductance constant, the number of turns of the coil has an important relationship with the perimeter. The smaller the perimeter, the more loops there are. Since there may be buried under the road with various metal materials such as cable lines, steel bars, and sewer covers, these will have a great influence on the actual inductance of the coil, so the data in the above table is for reference only. In practice, the user should use the inductance tester to actually measure the inductance of the inductor to determine the actual number of turns, as long as the final inductance of the coil is within a reasonable operating range (eg, between 100uH and 300uH).