Views: 3 Author: pqwt Publish Time: 2022-08-12 Origin: PQWT
Underground pipeline detector by the transmitter to generate electromagnetic waves and through different ways of transmitting connection will send signals to the underground metal pipeline to be detected, underground metal pipeline induction to electromagnetic waves, induction currents on the surface of the underground metal pipeline, induction currents will be spread along the metal pipeline to the distance, in the process of current propagation, and through the underground metal pipeline to the ground radiation out of electromagnetic waves, so that when When the receiver of the pipeline locator detects on the ground, it will receive the electromagnetic wave signal on the ground directly above the underground metal pipeline, and the underground pipeline detector will be able to discern the location and direction of the underground metal pipeline through the changes in the received signal strength.
PQWT-GX700 underground pipeline detector underground pipeline near and far ends are well grounded and form a circuit, then use the low frequency frequency; if the two ends are not well grounded, the circuit resistance is too large, or low-frequency signal coupling on, then switch to medium frequency, high frequency or radio frequency to test. There is no fixed principle for choosing the frequency, the following gives the basic principles of frequency selection: for high resistance pipelines (such as: communication cables, pipes with anti-corrosion layer and cast iron pipes) use high frequency or shot frequency. Be aware that the higher the frequency, the easier it is to sense the signal to other pipelines, and the shorter the signal propagation distance. For general detection of pipelines and cables, use medium and high frequencies. These frequencies travel farther and do not sense too much signal to other pipelines. Low frequency is suitable for long distance tracking. Low frequency signal travels a long distance and does not sense other pipelines. Low frequency signals are also suitable for long distance and well insulated transmission lines.
Generally consists of two major components.
1. transmitter: to the measured pipeline to apply a special frequency signal current, generally using the direct connection method, induction and clamping method three detection modes.
2. Receiver: receiver built-in induction coil to receive the magnetic field signal of the pipe, the coil generates induction current, so as to calculate the direction and path of the pipe. Generally there are three receiving modes: peak mode (maximum value), valley mode (minimum value), broad peak mode; in addition, now more advanced instruments are generally with peak arrow mode (combining the advantages of both peak and valley, making the operation more intuitive) and compass guidance (for indicating the direction of the pipeline).
Two types of principles
1 . One type is the use of electromagnetic induction principle to detect metal pipelines, electric / fiber optic cables, and some non-metallic pipelines with metal marker lines, this type is referred to as pipeline detector.
Advantages: fast detection, simple and intuitive, easy to operate, high accuracy.
Disadvantages: detection of non-metallic pipelines, you must use the non-metallic probe, this method is more laborious to use, the need to invade the interior of the pipeline.
2. Another category is the use of electromagnetic waves to detect all materials of underground pipelines, can also be used to find buried objects underground, commonly known as radar, also known as pipeline radar.
Advantages: can detect all materials of pipelines.
Disadvantages: high requirements for the environment, poor depth measurement ability (difficult to check the buried deeper pipelines), high requirements for the quality and experience of the operator.
Any instrument is not perfect and needs to be used in conjunction to bring out their best.
PQWT-GX700 type underground pipeline detector can locate and measure the buried depth of underground pipelines, cables and fiber optic cables under the condition of non-excavation. With professional data analysis software automatically into a map, super anti-interference ability, positioning and depth measurement function, suitable for underground detection of various metal pipelines and patrol, pipeline management and maintenance, municipal planning and construction, power supply and other departments of pipeline detection, is one of the necessary instruments for pipeline maintenance units.
1、 Transmitter function: with induction method, direct method and clamp method three signal application mode, suitable for different occasions.
2, receiver function: used for underground pipeline, cable location, direction, depth of burial and measurement of the current in the pipe.
3, left and right positioning arrows indicate the location of the target pipeline, positioning fast; front and rear arrows and dB value indicate the location and size of the corrosion-resistant layer breakage point.
4、With backlight function, suitable for night rescue use.
5、Current measurement: measure the current applied to the measured pipeline by the transmitter.
6、Multimeter function: can measure output voltage, line voltage, line current, impedance and power. Test the through-put and insulation quality of the cable before and after the cable fault finding.
7, external inductive clamp: suitable for testing the cable when the signal can not be applied directly connected to the site.
PQWT-GX700 pipeline detector technical parameters
Positioning accuracy: ±5% of the depth
Depth measurement accuracy: ± 5% of the depth (no interference from neighboring pipelines)
Current measurement accuracy: ±5% of the actual current
Depth measurement range: 6 meters
Working mode: valley method, peak method, broad peak method, peak arrow method
Working frequency: radio, 50Hz, 100Hz, 512Hz, 33KHz, 83KHz (working frequency varies slightly according to the product specifications and models)
Operating temperature: -20℃～＋50℃
Battery: 7.4V lithium battery
Weight: 1.6Kg (including battery)
Output power: 10W
Operating frequency: 128Hz, 512Hz, 1KHz, 2KHz, 8KHz, 33KHz, 65KHz, 83KHz
(working frequency varies slightly according to the product specifications)
Working mode: direct connection, induction and clamping three modes of automatic conversion
Battery: 14.8V built-in lithium battery pack
Operating temperature: -20℃～＋50℃
Weight: 2.5Kg (including battery)
Hunan Puqi Geological Exploration Equipment Research Institute is a professional institution engaged in the research and development of geological exploration equipment. It is mainly devoted to the research and development, production, sales and service of pipeline detector, physical prospecting water finder, pipeline leak detector, dike pipe surge detector, pressure pipeline leakage automatic analyzer, well imaging instrument, cavity instrument, prospecting instrument, pipeline cleaning machine, thermal imager.