Well-known manufacturers of portable ultrasonic flowmeters

Portable ultrasonic flowmeters are often used for pure water measurement in industry. Portable ultrasonic flowmeters are popular for portable use and mobile measurement. So what are the well-known manufacturers of portable ultrasonic flowmeters, and how to distinguish and find well-known manufacturers of portable ultrasonic flowmeters? The following editor will give you a specific introduction to this problem.　　 Before we understand the well-known manufacturers of portable ultrasonic flowmeters, let's first understand the characteristics of portable ultrasonic flowmeters. The characteristics of the portable ultrasonic flowmeter are as follows: 1. Non-contact measurement method, small size, easy to carry 2. Suitable for on-site measurement of various sizes of pipe sound conducting media 3. Built-in Ni-MH rechargeable battery working time of more than 20 hours 4. User The interface is flexible and easy to use. 5. Intelligent on-site printing function to ensure the integrity of the flow data. 6. Equipped with an integrated aluminum alloy protective box, which can be used in harsh outdoor environments. After understanding the characteristics, what aspects should be paid attention to when installing an ultrasonic flowmeter? Before installing the portable 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 and whether it contains Impurities, bubbles, and whether the tube is full; 　　 5. Fluid temperature; 　 　 6. Whether there are interference sources (such as frequency conversion, strong magnetic field, etc.) Need to remotely transmit signals and types; 　　 According to the on-site situation provided above, the manufacturer can configure it according to the on-site situation, 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 a pipe section that should be uniform and dense, and easy to ultrasonic transmission; 　　3, there must be a straight pipe section of sufficient length, and the straight pipe section upstream 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. Wiring probes and instrument wiring probes (sensors) can be divided into three types according to the actual measurement pipeline: 　　S-type sensor (15~100mm) 　　M-type sensor (50~700mm) 　　L-type sensor (300~6000mm) 　　After connecting the fine-tuning probe Fill the inside of the probe with silica gel, leave it for half an hour, then use silica gel and clamps to fix the probe on the polished pipe (note the direction of the probe and the lead end outward), and then observe the signal strength, goodness, and transmission time ratio of the meter If it is found to be bad, finely adjust the probe position until the signal of the instrument reaches the specified range: 　　 (signal strength: generally should be greater than 6.5, a few can be determined according to the specific situation of the site.) 　　 (signal goodness: low peak value It is 7 to 14, and the peak value is generally 25 to 80.) 　　 (Transmission time ratio: within the range of 100±4, this value must be stable.) 　　
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