How to detect electromagnetic flow meter by ultrasonic

Abstract: The information on how to detect electromagnetic flowmeters by ultrasonic waves is provided by excellent flowmeter and flowmeter manufacturers. In order to facilitate the on-line detection of the electromagnetic flowmeter, we suggest that standard measuring pipe sections can be configured in the system design for new pipelines to facilitate the on-line detection of the electromagnetic flowmeter in the future. The installation of the standard measuring pipe section should meet the front of the ultrasonic flowmeter. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on how to detect electromagnetic flowmeters through ultrasonic waves. In order to facilitate the on-line detection of the electromagnetic flowmeter, we suggest that standard measuring pipe sections can be configured in the system design for new pipelines to facilitate the on-line detection of the electromagnetic flowmeter in the future. The installation of the standard measuring pipe section should meet the requirements of the ultrasonic flowmeter for the front and rear straight pipe sections, and attention should be paid to ensure that the liquid is filled with the measuring pipe. At the same time, make a record of the pipe parameters, the material of the pipe, the outer diameter of the pipe, the thickness of the pipe wall, and the material and thickness of the pipe lining. For the original old pipeline, a section of the measuring point that better meets the operating conditions of the ultrasonic flowmeter can be selected on the pipeline to be tested, a section of stainless steel pipe can be installed, and the parameters of the stainless steel pipe can be recorded at the same time. Use the ultrasonic flowmeter certified by the legal institution as the standard table for online comparison, so as to determine the measurement accuracy of the electromagnetic flowmeter under test. For the sewage electromagnetic flowmeter, it can be generally selected when the suspended matter is small, and the temperature of the liquid is kept stable. When conditions permit, it can be calibrated with clean water to improve the measurement accuracy of the ultrasonic flowmeter. How to ensure the accuracy of online detection Through the test, we believe that we can start from the following points to ensure the accuracy of online detection of electromagnetic flowmeter: 1. Do the preparations before online detection. The accuracy of ultrasonic flowmeter to measure fluid flow is related to The user's understanding of the on-site working conditions is closely related. Before the inspection personnel start the inspection, they should first determine the following information: 1.1. The following conditions should be met when selecting the installation location of the probe: (1) There is no excessive dust and dust in the workplace. Corrosive gas; (2) The length of the straight pipe section: the upstream side is more than 10D, and the downstream measurement is more than 15D (when the flow rate is low, the requirements for the straight pipe section can be appropriately reduced); (3) There must be no disturbance factors within 30D of the upstream side (such as pump, (4) The fluid must be filled with the pipeline, without bubbles or excess impurities; (5) The pipeline where the probe is installed should not have strong mechanical vibration; (6) There should be enough space around the pipeline where the probe is installed. 1.2. The material, outer diameter of the pipe, the thickness of the pipe wall, the material and thickness of the pipe lining, the medium in the pipe, the temperature of the medium and other related quantities of the inspected pipeline are required to be measured and verified at the inspection site to ensure the accuracy of the measurement. 1.3. Common flow points of on-site working conditions, so as to detect common flow points of users and improve the accuracy of online detection. 1.4. The basic principle of selecting an ultrasonic flowmeter for online testing is the standard table comparison method. Therefore, the ultrasonic flowmeter should be regularly checked by the national legal metrological verification agency, and a valid verification certificate should be obtained. 2. Online inspection work is a job with strong technical and experience requirements. Therefore, strict training for inspection personnel is required, and it is especially required that the staff should carry out online inspection work in a scientific manner. 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 most important issue. We believe that the following principles are the principles that should be followed during the installation of the probe. (1) For horizontal pipelines, the probe should be installed on the horizontal centerline±45°(2) Avoid installing the probe on the deformed part, flange or welding part of the pipeline; (3) Before installation, the probe installation surface should be treated, first remove the rust, dirt, etc. on the surface of the pipeline (the surface of the pipeline is protected). When removing layers, the protective layer should be stripped first) to make the surface of the pipe wall smooth and free of dirt. The cleaning range should reach the entire circumference of the probe installation distance L+200mm width; (4) Apply the couplant to the entire emitting surface of the probe without forming bubbles; (5) Apply silicone grease on the surface of the pipe; (6) Put the probe Firmly stick it on the pipe wall, and fix the probe with a steel tape (note: the emission directions of the two probes must be opposite). Input the working condition parameters verified by the on-site measurement into the flowmeter and check the signal reception. After confirming that the operation is normal, the detection can be started. During detection, different flow points are determined according to the commonly used flow, which can be adjusted by pumps or valves, and the flow indication values ​​of the standard meter and the flow meter under test are collected at the same time to determine the indication error of the flow meter under test. When reading the flow display value, it should be carried out when the flow rate is stable, and read about 10 display values ​​in the same period of time and take the average value to reduce the error caused by the reading. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'How to detect electromagnetic flow meter by ultrasonic wave'
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