Underground cable detector pipeline detector FAQ Q: How did the interference occur during the detection process? Answer: The buried cable tester is an electromagnetic field generated by detecting the applied signal current on the target metal pipeline. In the ideal case, the shape of the electromagnetic field should be a standard concentric circle. The most common cause of interference is the coupling of signals on the target pipeline to adjacent pipelines. The disturbed electromagnetic field is a deformed electromagnetic field, which results in inaccurate readings. The higher the transmission frequency, the greater the interference of adjacent pipelines. Q: Why do I detect interference signals in other pipelines? A: This condition is due to the signal applied by the transmitter. The signal is shunted to other lines through the common ground point or is coupled to other lines by mutual inductance. It is better to use the direct connection method to apply the signal, or to replace the signal application point, and use a lower frequency (low frequency). Q: How to use the valley method to verify the accuracy of peak method positioning? A: For the ideal non-interfering pipeline, the position of the crest/valley method is coincident. However, for parallel pipelines or other disturbances, the position of the crest/wave method will not coincide. The actual position of the pipeline at this time is on the peak side of the wave. When the interference is severe, the zero point may not be found. At this time, the position of the pipeline can only be given based on the peak position. It is better to change the way to apply the signal and reposition the pipeline. When the position measured by the crest/valley method is not coincident, there will be a large deviation in the pipeline direct reading depth measurement, and even the depth cannot be read out. Q: Is there any way to reduce the deformation of the electromagnetic field of the pipeline? A: First of all, you can try to reduce the output power of the transmitter. Sometimes the signal is too strong and the detection effect is not necessarily the best, especially when multiple pipelines are in parallel and in very close proximity. If the induction method is used, the direct connection method or the clamp method can be used instead to apply the signal. These can reduce the signal coupled to other pipelines, thereby reducing the deformation of the pipeline electromagnetic field morphology. If you find that the valley method and the peak method are inconsistently positioned, and you change positions for a consistent place, if you do not find a consistent place, we usually use the peak position as the position of the pipeline. The depth measurement is also performed in the peak mode, of course. There is some error, but it is closer to the true value than the valley method. Q: Can the device be used to detect copper cables and optical cables at the same time? A: Current underground pipeline detectors can only detect cables with metal jackets or core wires. Only cables with metal jackets or central metal reinforcements can be detected by underground lines. To detect the cable, a detectable signal (transmitter signal) must be applied to the conductor. Q: Why is the depth measurement of my receiver inaccurate? Answer: 1. Check whether the correct working mode is selected. Select the peak mode. 2. Check if the position of the peak method and the valley method are consistent. Although the direct-reading sounding method is simple, it takes certain conditions to read the correct result, otherwise the measurement accuracy is not high, and even wrong results are obtained. One of the conditions for applying direct reading sounding is that the peak zero value at this time must basically coincide, otherwise the error will be large. The second is that the depth of direct reading must be corrected to achieve higher reliability. The factors for correction include: the humidity of the buried soil of the pipeline, and the frequency of the detection signal. Generally, the higher the soil humidity, the higher the detection frequency, and the correction factor. Should be smaller, generally between 0.8-0.95. The simple method is to find a pipe section with a known depth and no disturbance, measure the direct reading depth, and compare the correction factor with the actual depth. 3. When measuring the buried depth, pay attention to the direction of the receiver, and try to make the coil of the receiver and the pipeline go perpendicular. This requirement can be achieved by slightly turning the receiver so that the display on the panel reaches the maximum value. In addition, it should also be noted that direct reading depth is the distance from the receiver's fuselage surface to the center of the pipeline. Q: What is the reason for the sudden decrease in signal strength? Answer: If the current measurement suddenly decreases, it may be a T-shaped bifurcation or branch tube. Perform a 360-degree scan within the area to find other centerlines to see if the conductors have branches. If there is a change in depth and signal strength, then the current measurement should be checked. If the current measurement remains constant, it is still above the target pipeline, just because the depth of the underground metal pipeline has changed. Current measurements can help the user determine that changes in the depth of the underground metal pipeline have caused changes in the detected signal strength. Q: What if the sensing signal senses other pipelines? A: The following methods can be used: 1, turn down the frequency 2, turn down the power 3, if possible using direct connection or clamp 4. Plug the grounding away from the target pipeline and other buried pipelines 5. Apply the signal farthest from the target pipeline and other pipelines
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