Shanghai Huamai guides how to install the ultrasonic flow meter correctly

Abstract: Shanghai Huamai guides how to correctly install ultrasonic flow meter information provided by excellent flow meter and flow meter manufacturers. In recent years, MLF-100 ultrasonic flowmeter has been more and more widely used in the flow measurement of various fluids and plays a very important role in metering management. In the actual use process, we found that most of the inaccurate measurement is due to improper installation of the probe. For more flowmeter manufacturers to choose models and price quotations, you are welcome to inquire. The following is the Shanghai Huamai guide on how to install the ultrasonic flowmeter correctly. In recent years, MLF-100 ultrasonic flowmeter has been more and more widely used in the flow measurement of various fluids, and plays a very important role in metering management. In actual use, we found that most of the inaccurate measurements were caused by improper probe installation. Therefore, the correct installation of the probe becomes the first problem. After long-term practice, we believe that the following are the principles that should be followed in the process of probe installation. 1. Select the installation position of the probe 1.1 The conditions that the installation position should meet (1) There is no excessive dust and corrosive gas in the workplace; (2) The length of the straight pipe section: more than 10D on the upstream side and more than 5D on the downstream side (when the flow rate is low, The requirements for straight pipe sections can be appropriately reduced): (3) There should be no disturbance factors (such as pumps, valves, etc.) within 30D of the upstream side; (4) The fluid must be filled with the pipeline, and cannot contain air bubbles or excess impurities; (5) The pipeline where the probe is installed is not There should be strong mechanical vibration; (6) enough space is required around the pipeline where the probe is installed. 1.2 Points to note (1) For horizontal pipelines, the probe should be installed on the±45°(2) For vertical pipelines, the probe can be installed at any position on the outer circumference; (3) It should be avoided to install the probe on the deformation part, flange or welding part of the pipeline. 2. Select the probe installation method The probe adopts the V method and the Z method to install the Z method in the following situations: (1) The installation space is limited; (2) The measured fluid contains a small amount of impurities; (3) The receiving wave is weak (such as cement lining). Basis for choosing an installation method: In general, D>The 300mm pipeline is installed by the Z method. 3. Treatment of the probe installation surface Before installation, first remove the rust and dirt on the surface of the pipeline (if there is a protective layer on the surface of the pipeline, the protective layer should be stripped first), so that the surface of the pipe wall is smooth and free of dirt. The cleaning range should reach the entire circumference of the probe installation distance L+200mm width. 4. Determination of the installation point Step 1: Make standard paper (1) Prepare a paper tape with a long side of 4D or more and a wide side of 200mm or equal to D. (2) At a distance of 100mm from the long side of the tape, draw a parallel line (also called a marker line) with the wide side. Step 2: Determine a point at a distance of 100mm from the edge of the treated pipe segment, and align the edge of the marked line with this point. Roll up the standard paper against the tube wall so that the marking line is parallel to the tube axis, and the edges of the standard paper should coincide. Step 3: Extend the marked line of the standard paper and draw a straight line on the pipe. Step 4: Draw a circular line on the pipe along the standard paper, and the intersection point with the straight line A is A0. Step 5: Use the V method to install, remove the standard paper, draw the line segment A0A2=L on the straight line (L is the installation distance of the probe), and determine the A2 point. A0 and A2 are the probe mounting points. For example: L=200mm Step 6: Use the Z method to install, draw a circle line on the pipe along the other side of the standard paper, and intersect the line at A1. Starting from line A0A1, the standard paper moves in a circle. At 1/2 the circumference, extend the marked line on the standard paper, and draw a straight line on the pipe, intersecting the two circle lines on the pipe, and the intersection point is B1B2. Remove the standard paper, draw a line segment B1B2 (L is the probe installation distance) on the self-line, and determine the B2 point. A0 and B2 are the probe mounting points. 5. Install the probe on the pipeline 1) Grind the installation point, and the grinding area is about 3 times the area of ​​the probe; 2) Remove the oil stains on the probe emitting surface and the pipeline installation surface; 3) Apply the couplant to the entire emitting surface of the probe, do not Form bubbles; 4) Coat the surface of the pipe with silicone grease; 5) Stick the probe firmly on the pipe wall, and fix the probe with a cloth or steel tape (note: the emission directions of the two probes must be opposite). The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Shanghai Huamai Guides How to Correctly Install Ultrasonic Flow Meters'

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