Analysis of common mistakes in the application of electromagnetic flowmeters

Abstract: The analysis information of common mistakes in the application of electromagnetic flowmeters is provided by excellent flowmeter and flowmeter manufacturers. Common application errors of electromagnetic flowmeters include poor operation and flow disturbances and poor installation; noisy cavitation and air bubbles in the liquid; condensate in the gas; wear and deposition, etc. These mistakes often lead to electromagnetic flowmeter users often from the process. More flowmeter manufacturers select models and price quotations. You are welcome to inquire. The following is the analysis article details of common mistakes in the application of electromagnetic flowmeters. Common application errors of electromagnetic flowmeters include poor operation and flow disturbances and poor installation; noisy cavitation and air bubbles in the liquid; condensate in the gas; wear and deposition, etc. These mistakes often cause electromagnetic flowmeter users to feel that the flowmeter measurement is inaccurate from the material balance of the process system, comparison with historical measurement values ​​or comparison with other reference flow measurement values, but remove the meter and go to the flow standard device for verification. Except for a few faults in the instrument itself (such as the fallacy of debugging settings), most instruments are proved to be normal. Most of the reasons are due to improper installation and arrangement of the instrument and the mixing of different phases in the medium in the pipeline (such as condensed droplets in the gas, and air bubbles in the liquid), etc., resulting in application errors. Poor installation Poor installation operation and improper arrangement are common: 1) The acute angle of the standard orifice plate is not installed on the upstream surface. 2) The inner diameter DN of the sealing gasket between the instrument and the pipeline is smaller than the inner diameter D of the pipelineρand the inner diameter of the meter Dm to generate the flow rate. DN should be slightly larger than Dm. 3) The gasket is eccentric (misaligned). The eccentric installation of the sealing gasket covers part of the flow area, causing serious distortion and asymmetry of the velocity distribution. Since the asymmetric flow occurs at the inlet of the flow sensor, even if the length of the upstream straight pipe section is zero, it will bring measurement errors to instruments such as differential pressure, turbine, vortex, ultrasonic, target, and electromagnetic. 4) The electromagnetic flowmeter is in the wrong flow direction. 5) Install the instrument sensitive to vibration interference on the official road with vibration. 6) Lack of necessary protective accessories. These defects are well known or should be avoided by the instrument factory. However, such mistakes are not uncommon because operators are not seriously trained and lack knowledge. Although the inner diameter of the gasket is too small or the installation is eccentric, although it has no or very little effect on the flow value of volumetric, float, electromagnetic flowmeters and other instruments, it will increase additional pressure loss. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Analysis of Common Errors in the Application of Electromagnetic Flow Meters'

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