Analysis of underground pipeline detectors are divided into two categories according to the detection principle
The underground pipeline detector can quickly and accurately detect the location, direction, depth of underground water pipes, metal pipes, cables, etc., and the location and size of the damage points of the steel pipeline anticorrosion layer without damaging the ground cover. It is one of the indispensable instruments for water supply company, gas company, railway communication, industrial and mining, infrastructure unit renovation, maintenance, and general survey of underground pipelines.
Composition Introduction
Underground pipeline detectors generate electromagnetic waves from transmitters and transmit signals to underground metal pipelines through different transmission connections. After the underground metal pipelines induce electromagnetic waves, an induced current is generated on the surface of the underground metal pipelines, and the induced current will Propagating the metal pipeline far away, during the current propagation process, electromagnetic waves will be radiated to the ground through the underground metal pipeline, so that when the pipeline locator receiver is detecting on the ground, it will be on the ground directly above the underground metal pipeline After receiving the electromagnetic wave signal, the underground pipeline detector can determine the location and direction of the underground metal pipeline by the strength of the received signal.
The GH-6600B underground pipeline detector is well grounded at the near and far end of the underground pipeline and forms a loop, then low frequency is used; if the grounding at both ends is not good, the loop resistance is too large, or the low frequency signal is not coupled, then Instead, use intermediate frequency, high frequency or radio frequency to test. There is no principle of fixed frequency selection. The basic principles of frequency selection are given below: For high-resistance pipelines (such as: communication cables, pipelines with anti-corrosion coating and cast iron pipes), use high frequency or radio frequency. It should be noted that the higher the frequency, the easier the signal is to sense on other pipelines, and the shorter the signal propagation distance. For general pipeline and cable detection, use medium frequency and high frequency. These frequencies travel relatively long distances, and will not induce too many signals to other pipelines. Low frequency is suitable for long distance tracking. The low-frequency signal has a long propagation distance and does not sense other pipelines. Low frequency signals are also suitable for long-distance and well-insulated pipelines.
Generally consists of two parts:
1. Transmitter: apply a signal current of a special frequency to the pipeline under test, generally using three excitation modes: direct connection method, induction method and clamp method
2. Receiver: The receiver has a built-in induction coil to receive the magnetic field signal of the pipeline, and the coil generates an induced current to calculate the direction and path of the pipeline. There are generally three reception modes: peak mode (maximum value), valley value mode (minimum value), and wide peak mode; in addition, more advanced instruments now generally have peak arrow mode (combining the advantages of peak and valley values, Make the operation more intuitive) and compass guide (used to indicate the direction of the pipeline).
Divided into two categories according to the detection principle
1. One is to use the principle of electromagnetic induction to detect metal pipelines, electrical / optical cables, and some non-metallic pipelines with metal marking lines.
Advantages: fast detection speed, simple and intuitive, convenient operation and high accuracy.
Disadvantages: When detecting non-metallic pipelines, you must use non-metallic probes. This method is more laborious to use and requires intrusion into the pipeline.
Underground pipeline detector
2. The other type is the use of electromagnetic waves to detect underground pipelines of all materials. It can also be used to find buried objects underground, commonly known as radar, also known as pipeline radar.
Advantages: can detect pipelines of all materials
Disadvantages: higher requirements for the environment, poor sounding ability (difficult to find deep buried pipelines), and high requirements for operator quality and experience.
Any instrument is not perfect, it needs to be used together to play their ultimate
Traditionally, the pipeline detector only refers to the pipeline detector using the principle of electromagnetic induction, and is also the most used instrument
How to choose pipeline detector
1. According to your needs: Many pipeline instruments are only suitable for part of the detection requirements. When choosing, you should understand the scope of application of pipeline instruments
2. Understand the test method of pipeline instrument, whether it is easier to operate and the interface is more intuitive
3. Understand the function of pipeline instrument, whether the sounding ability meets your needs
4. Whether the configuration of the accessories is complete, such as clamps (usually used for cable detection in dense areas), rechargeable batteries (saving detection costs), etc.
5. The sustainable development of the instrument, whether the ever-changing technology can be upgraded, is also a test standard of the instrument
6. The compatibility of the instrument, whether the frequency of reception and transmission is wide, is conducive to detection and expands the use.
Features
1. The portable design of the underground pipeline detector has a sturdy shell and is resistant to pressure and impact. It is suitable for field operations. Full digital control, easy to operate.
2. Chinese graphic display, one person can complete all operations. The transmitter has overload and overheat protection functions.
3. Detection without excavation, can accurately measure the position of the buried pipeline, and can accurately locate the pipeline depth.
4. The underground pipeline detector can effectively detect pipelines with branch pipes or nets.
5. The two detection methods of alternating current gradient method and ground electric field method confirm each other, which not only improves the detection efficiency, but also ensures the detection accuracy
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