External binding ultrasonic flowmeter

The external binding ultrasonic flowmeter is a unique installation method of the ultrasonic flowmeter. Its purpose is to fix the probe on the pipeline without moving. Compared with the broken pipe installation, it is a simpler installation method. The specific installation method As shown in the figure below: The working principle of 　　 externally bound ultrasonic flowmeter: Generally, the time difference method is used for measurement, and the Doppler method is rarely used now. That is: when the ultrasonic beam propagates in the liquid, due to the flow of the fluid, there will be a slight difference in the propagation time of the ultrasonic wave in the forward and backward directions. This tiny difference in propagation time is proportional to the flow velocity of the liquid, thereby measuring the flow rate of the fluid.　　 After understanding the principle of the externally bound ultrasonic flowmeter, let's briefly introduce its advantages and disadvantages. The advantages of the externally bound ultrasonic flowmeter: 　　1, because it is bundled on the outside of the pipeline, it does not damage the fluid in the pipeline, does not affect the process flow, and can be disassembled at any time; 　　2, because it is bundled on the outside of the pipeline, there is no pressure resistance problem; 　　3, no In contact with the medium, the corrosiveness of the medium is ignored, and the measurement medium range is wide; 　　4, the price is much cheaper compared with the large-diameter pipeline flowmeter; the disadvantages of the externally bound ultrasonic flowmeter: 　　1, it cannot withstand high temperatures, generally not higher than 160 Degree; 　　2, small diameter (below DN15) cannot be installed and measured; 　　3, relative to pipe segment and plug-in ultrasonic flowmeters, because the signal needs to pass through the pipe wall, its accuracy and signal strength, quality and pipe material, installation specifications and Whether or not it matters, there will be more factors causing errors. So what aspects should be paid attention to when installing the externally bound ultrasonic flowmeter? Before installing the externally bound ultrasonic flowmeter, you should understand the site conditions, including: 　　1. What is the distance between the sensor installation and the host; 　　2. Pipe material, pipe wall thickness And pipe diameter; 　　3. Pipeline age; 　　4. Fluid type, whether it contains impurities, bubbles, and whether the pipe is full; 　　5. Fluid temperature; 　　6. Whether there are interference sources (such as frequency conversion, strong magnetic field, etc.) at the installation site; 　　7. Host placement Temperature in four seasons; 　　 8. Whether the power supply voltage used is stable; 　 　 9. Whether remote signal transmission and type are needed; 　 　 According to the field conditions provided above, the manufacturer can configure it according to the field conditions, and special models can also be made if necessary. The choice of installation location to install the pipe section has a great influence on the test accuracy. The selected pipe section should avoid interference and eddy currents, which have a greater impact on the measurement accuracy. Generally, the pipe section should meet the following conditions: 　　 1. Avoid pumps and high-power radios , Frequency conversion, that is, install the machine where there is strong magnetic field and vibration interference; 　　2, choose the pipe section that should be uniform and dense, easy to ultrasonic transmission; 　　3, there must be a long enough straight pipe section, the upstream straight pipe section of the installation point must be greater than 10D (Note: Du003ddiameter), the downstream should be greater than 5D; 　　4, the upstream of the installation point should be 30D away from the pump; 　　5, the fluid should be filled with the pipeline; 　　6, there should be enough space around the pipeline to facilitate the operation of the site personnel, and the underground pipeline needs to be a test well. The test wells are as follows: 　　 installation methods There are generally two probe installation methods for ultrasonic flowmeters, namely Z method and V method. However, when D <200mm and the site situation is one of the following conditions, the Z method can also be used for installation: 　　 1. When the turbidity of the measured fluid is high, the signal cannot be received by the V method or the signal is very weak; 　　2 When the inner wall of the pipeline is lined; 　　3. When the pipeline has a long service life and the inner wall fouls seriously; 　　 For those with better pipeline conditions, even if D is slightly larger than 200mm, in order to improve the measurement accuracy, the V method can also be used for installation. Probe position 1. Enter the pipeline parameters into the instrument, select the probe installation method, and get the installation distance; 　　 2. On a horizontal pipeline, generally choose the middle of the pipeline to avoid the top and bottom (the top may contain bubbles and the bottom may have sediment) ;　　3, V method installation: first determine a point, and measure another point in the horizontal position according to the installation distance.　　Z method installation: first determine a point, measure another point in the horizontal position according to the installation distance, and then measure the symmetry point of this point on the other side of the pipeline.　　Pipe treatment　　After determining the position of the probe, within ±100mm of the two installation points, use an angle grinder, files, sandpaper and other tools to polish the pipe to a bright, smooth, and non-corroded pit.　　Requirement: uniform gloss, no undulations, smooth and mellow hand feeling. Special attention is needed. The polishing point must have the same arc as the original pipeline. Do not polish the installation point to a flat surface. Use alcohol or gasoline to clean the area to facilitate the bonding of the probe.　　 I believe that after reading the above, everyone has a systematic understanding of the externally bound ultrasonic flowmeter. When facing on-site installation and selection, pay attention to combining on-site working conditions, specific analysis and selection of appropriate instruments and installation, so that more accurate measurement results can be obtained.
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