Underground pipeline detector principle and pipeline detector measurement method

GH-6600B underground pipeline detector works: The electromagnetic wave generated by the transmitter transmits the transmitted signal to the underground metal pipeline through different transmission connections. After the underground metal pipeline senses the electromagnetic wave, an induced current is generated on the surface of the underground metal pipeline. The induced current will travel far away along the metal pipeline. During the propagation of the current, electromagnetic waves will be radiated to the ground through the underground metal pipeline, so that when the pipeline locator receiver is detected on the ground, it will be underground. The ground directly above the metal pipeline receives the electromagnetic wave signal, and the GH-6600B underground pipeline detector can determine the position and orientation of the underground metal pipeline by receiving the signal strength change.
For general pipeline and cable detection, use intermediate and high frequencies. These frequencies travel farther and do not sense too much signal to other pipelines. The low frequency is suitable for long distance tracking. Low frequency signals travel long distances and do not sense on other pipelines. Low frequency signals are also suitable for long distance and well insulated transmission lines.

Underground pipeline detectors use the principle of electromagnetic induction to detect the precise direction and depth of underground cables, as well as the open, short and skin fault points of the positioning cable. Intelligent Chinese characters, graphic operation instructions and audio frequency indications make it the easiest thing today. The pipeline locator used. The transmitter's built-in ohmmeter automatically measures loop resistance and continuous automatic output impedance matching to ensure optimal output matching. For the cable fault test, the instrument can apply the step voltage method, and use the direct buried cable fault test accessory ("A" frame) to judge the cable ground fault of the buried cable with the ground insulation resistance less than 2M ohm and the cable sheath. The location of the fault; the signal strength and weakness method can also be used to judge the cable open circuit and short circuit fault. The coupling clamp can be used to find the path of the live cable. The 50Hz detection function of the receiver can also be used to track the 50Hz power frequency signal sent by the running cable, which is truly multi-purpose and has the best performance-price ratio.

Q: How is interference generated during the detection process?
A: The pipeline locator is an electromagnetic field generated by the application of a signal current on a target metal line. Ideally, the shape of the electromagnetic field should be a standard concentric circle. The most common cause of interference generation is that signals on the target pipeline are coupled to adjacent pipelines. The disturbed electromagnetic field is a deformed electromagnetic field that causes inaccurate readings. The higher the transmission frequency, the greater the interference of adjacent pipelines.
Q: Why do I detect interference signals on other pipelines?
A: This is due to the signal applied by the transmitter, which shunts the signal to other lines or mutual inductance to other lines through a common ground point. It is best to apply the signal using the direct connection method, or replace the signal application point and use a lower frequency.
Q: How can I use the valley method to verify the accuracy of the peak method positioning?
A: For ideal interference-free pipelines, the location of the peak/valley method is coincident. However, for parallel pipelines or other disturbances, the position of the peak/valley method will not coincide. The actual position of the pipeline at this time is on the peak side. When the interference is severe, the zero point may not be found. At this time, the position of the pipeline can only be given according to the peak position. It is best to change the way the signal is applied and re-align the pipeline. When the positions measured by the peak/valley method do not coincide, the direct reading sounding of the pipeline will also have a large deviation, and even the depth cannot be read.