Ultrasonic flowmeter brand

Ultrasonic flowmeter is an instrument that uses the principle of ultrasonic propagation time difference to measure the liquid flow rate. There are many brands of ultrasonic flowmeters on the market, so how to choose the most cost-effective ultrasonic flowmeter brand among the many brands of mixed brands? The following editor briefly introduces Under the principle of ultrasonic flowmeter and precautions for selection, I believe you will have an understanding of how to choose the brand of ultrasonic flowmeter after reading it.　　 The working principle of 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 slight 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 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 It doesn't matter whether it is or not, and 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 installation sensor and the host; 　　2. The pipe material and 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. After understanding the advantages and disadvantages of ultrasonic flowmeters, we will introduce how to choose a suitable ultrasonic flowmeter. The following points should be paid attention to when selecting ultrasonic flowmeter. Under normal circumstances, the field parameters provided by the instrument manufacturer include: 　　1 Measuring medium type 2, medium temperature, turbidity, corrosiveness 3, nominal pressure 4, flow size (velocity) 　 　 5, pipe diameter and material selection, the performance parameters of the instrument required by the customer include: 　　 1, sensor installation method : Outer clamp, plug-in, pipe segment type 2. Amplifier form: power supply, output signal (current, pulse, communication, relay) 　　 3. Whether the split type installation location is selected and the installation pipe section has a great influence on the test accuracy, the selected pipe section should Avoid interference and eddy currents that have a greater impact on the measurement accuracy. Generally, the pipe section should meet the following conditions: 　　 1. Avoid installing machines at water pumps, high-power radio stations, frequency conversion, that is, where there is strong magnetic field and vibration interference; 　　2 Choose a pipe section that should be uniform and dense and easy to ultrasonic transmission; 　　3. There must be a straight pipe section long enough, the upstream straight pipe section of the installation point must be greater than 10D (note: Du003ddiameter), and the downstream must be greater than 5D; 　　4, the upstream distance of the installation point The pump should have a distance of 30D; 　　5. The fluid should be filled with the pipeline; 　　6. There should be enough space around the pipeline to facilitate the operation of the on-site personnel. The underground pipeline needs to be tested. The test well is 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 symmetrical point of this point on the other side of the pipeline.
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