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The underground pipeline detector is one of the essential instruments of the water company, gas company, railway communication, industrial and mining, infrastructure, transformation, maintenance, and census underground pipelines. It can quickly and accurately detect the underground without damaging the ground cover. The location, trend, depth of pipelines, metal pipelines, cables, etc., and the location and size of damaged points in the corrosion protection layer of steel pipelines.
The vast majority of underground pipelines are metallic materials that can transmit electromagnetic waves. Based on this principle, Baoying Huachen Power Equipment Factory designed and developed an instrument that can intelligently detect the position of pipelines by detecting electromagnetic waves emitted from pipelines. detector. The underground pipeline detector has a wide range of users in fields such as electric power, telecommunications, water supply, thermal power, gas, petroleum, chemical industry, and urban public utilities with its superior performance, flexible and convenient detection methods.
Here we take the intelligent pipeline detector of Yangzhou Zhili Company as an example to introduce the operation method of the underground pipeline detector in detail:
1. There are three ways to connect transmitter transmitters: direct connection, inductive coupling, and induction. We focus on direct links:
direct connection:
(1) Insert the cable to turn off the transmitter and insert the straight cable into the transmitter output socket.
(2) Connecting with the conductor Connect the red wire of the connecting wire to the target-uncharged metal part.
(3) Choose the grounding method. Connect the black lead of the connecting wire as far as possible from the pipeline and make a right angle with the pipeline. Look for metal ready grounds (such as street signs). Be careful not to go near any underground conductors nearby. If there is no existing grounding point, grounding solder can be used. Ground the solder as much as possible, then connect the black lead. To improve the conductivity. Can be poured under the board (4) Select frequency audio: for good conductors and long distance positioning.
IF: Intermediate frequency radio frequency for audio RF: General positioning of pipelines with dense piping or non-metallic joints.
(5) Select output power Select high and low gears according to specific conditions.
(6) Check loop resistance The transmitter automatically checks the loop resistance and displays the measured resistance in the LCD. The higher the resistance, the weaker the signal of the conductor. The resistance cannot be reliably positioned when the resistance exceeds 30KΩ. It is possible to change the position, preferably on moist land or on the ground, thus reducing the resistance of the ground. If necessary, move it several times to find the point with the least resistance. Note: Be sure to turn off the ground before pulling out the ground. After a good boot.
Warning: Never connect directly with live cables. Be sure to disconnect the cable when connecting directly to the cable.
2. Receiver Path Pursuit (1) The receiver is turned on.
(2) Check the battery level. When the battery level is low, replace the battery.
(3) Set the frequency and press the frequency key to set the receiver to the desired frequency. If active positioning mode is used, the frequency of the receiver should match the transmitter. The frequency of selection depends on the test conditions. Audio and RF have their own strengths. The audio wavelength is larger and the transmission distance is longer, so audio is generally used first. If the signal abruptly vanishes, disappears, or turns or turns accidentally, then the RF verification results must be used again.
Sensitivity setting The "gain plus minus" key is used to increase or decrease the gain and increase or decrease the sensitivity. If the reading of the number is too low, adjust the Gain Plus key so that the bar graph reading is between 40-50 of the entire range. Similarly, if the digital reading is too high, adjust the Gain minus key so that the bar graph reads between 40-50 of the entire range.
Select the track mode and press the mode key to select the crest or trough pursuit mode.
The wave peak method keeps the detector of the underground pipeline detector substantially perpendicular to the ground and moves the receiver above the pipeline. When the receiver is directly above the pipeline path, the maximum value can be obtained by moving the receiver. See below. When you shake the receiver gradually away from the pipeline path, the bar graph and readings (acoustic response frequency) will decrease; when you shake the receiver directly above the pipeline path, the maximum segment of the intensity value will show the path of the pipeline. It is consistent with the receiver's plane. Then start tracking at the transmitter at the right speed and move the receiver left and right. Watch the table for indications of peak readings.
The trough method is required to make the plane of the receiver perpendicular to the direction of the pipeline when tracking the survey, and vice versa. When the plane and the direction of the pipeline are parallel, the measured intensity is the minimum. This feature is often used to determine the direction of the pipeline.
Move the receiver above the pipeline. When the receiver is directly above the pipeline path, the receiver can get the minimum value and the sound response is also very small. When you shake the receiver off the minimum, the meter's reading will rise to a peak: and the voice response will be in its highest segment. As the receiver shakes along the peak area, the meter's reading will start to decay. Then start tracking from the transmitter at a moderate rate while shaking the receiver side to side. Look at signal strength and reading indications.
3. Scan and search (sensing search)
Inductive search is the most reliable technique for detecting unknown pipelines. This search method requires a transmitter and receiver and two operators. This search method is called "two-person search." Before starting the search, determine the areas to search for and the possible directions through which the pipeline passes. And set the on transmitter in induction mode. The first person operates the transmitter and the second person operates the receiver. When the transmitter passes the pipeline, a signal is applied to the pipeline, and then the receiver can detect the signal 20 meters upstream or downstream from the transmitter. The direction of the transmitter is consistent with the estimated direction of the pipeline. The second person is holding the receiver at the beginning of the area to be searched and the direction of the antenna of the receiver remains perpendicular to the direction of the possible underground pipeline. The receiver is tuned to the highest sensitivity that will not receive transmitter signals directly from the air. When the direction of the transmitter and receiver is correct, the two operators move forward in parallel. The operator carrying the receiver moves the receiver back and forth while moving forward. The transmitter applies the signal to the pipeline directly below and the receiver detects the signal. Mark the ground at the receiver's detected peak position. Repeat the search in other directions where there may be a pipeline crossing.
4. Induction skills:
Keeping the Distance Between the Transmitter and the Transmitter In the inductive mode, the transmitter sends a signal to the air in addition to the target pipeline, which may interfere with the probing work near the transmitter. To check that the receiver is detecting a signal in the pipeline, rather than a signal directly from the transmitter, move the transmitter a meter or two, and if the pipeline also moves with it, this indicates that the receiver is too close to the transmitter. Another way to check whether the receiver receives the transmitter signal is to point the receiver at the transmitter. If the response size of the receiver does not change or increase, it indicates that the receiver received the transmitter signal directly from the air. In this case, the transmitter output power is reduced and the receiver sensitivity is reduced. The receiver may also have to leave the transmitter 25 to 30 meters. Do not place the transmitter on the well cover as this will prevent the signal from reaching the pipeline.
Dear Customer:
Thank you for your attention to our products. In addition to this product introduction, the company also has insulation ladders, high-voltage insulation mats, cable fault testers, high-voltage measuring instruments, insulation boots gloves pressure test equipment, power safety equipment cabinets, etc. Introduction, if you are interested in our products, welcome to inquire. Thank you!
Pipeline instrument operation method explanation
Pipeline instrument manufacturers