Influence Analysis of Measurement Accuracy of Electromagnetic Flow Meter

Abstract: The analysis information of the influence of the measurement accuracy of the electromagnetic flowmeter meter is provided by the excellent flowmeter and flowmeter production and quotation manufacturers. The electromagnetic flowmeter produced by Weinan and Shunda manufacturers is a flow measuring instrument designed according to Faraday's law of electromagnetic induction. According to the measurement principle of electromagnetic flowmeter, its flow measurement is not affected by changes in fluid density, temperature, pressure, etc., and the measurement is accurate. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the analysis article on the impact of electromagnetic flowmeter measurement accuracy. The electromagnetic flowmeter produced by the manufacturer is a flow measuring instrument designed according to Faraday's law of electromagnetic induction. According to the measurement principle of the electromagnetic flowmeter, its flow measurement is not affected by changes in fluid density, temperature, pressure, etc., and the measurement accuracy is high. There are no flow blocking parts in the tube, and the pressure loss is extremely small. These characteristics make electromagnetic flowmeters widely used in legal measurement institutions and various production enterprises. Today's technology will analyze the factors that affect the measurement accuracy of electromagnetic flowmeters. Analysis of factors affecting the measurement of battery flowmeters: 1. The influence of electrical conductivity The premise of using electromagnetic flowmeters is that the liquid to be measured must be conductive, and the electrical conductivity cannot be low. at the lower limit. If the conductivity is lower than the lower limit value, it will cause measurement error and make it unusable. The threshold value of the universal electromagnetic flowmeter is (5×10-6 to 1×10-4) s/cm, depending on the model. The conductivity of the fluid determines the input impedance of the converter. When the conductivity of the fluid decreases, the output impedance of the electrode will increase, and the error will be caused by the load effect caused by the input impedance of the converter. 2. Influence of liquid temperature According to the principle of electromagnetic flowmeter, it is generally believed that the measurement of electromagnetic flowmeter is not affected by temperature, but in the actual verification process, we found that the measurement of electromagnetic flowmeter is still affected by a certain temperature. In some hot water flow standard devices, an electromagnetic flowmeter is usually used as a standard meter, and the required temperature range is from normal temperature to 85 °C. In the experimental verification, it is found that when the temperature reaches above 80 ℃, due to the influence of slight deformation of the lining, the measured data has a change of more than 1%, and the impact on the high-precision electromagnetic flowmeter cannot be ignored. 3. The influence of the installation method The electromagnetic flowmeter requires the fluid to be in a full pipe state, and the flow rate is evenly distributed. If the flow velocity flows symmetrically around the central axis, the induced potential is proportional to the average flow velocity. If the flow velocity is not uniform, the geometric position of each flow particle relative to the electrode is different, and the induced electromotive force generated by the counter electrode is also different. In order to ensure the uniform flow rate, it is necessary to at least ensure that the length of the front straight pipe section of the battery flowmeter is greater than or equal to 10 times the pipe diameter, and the length of the rear straight pipe section is greater than or equal to 5 times the pipe diameter. At the same time, the electromagnetic flowmeter must have a reliable grounding method, otherwise it is prone to fluctuations in the indication value. 4. Influence of operating environment Due to the low induced voltage generated by the electromagnetic flowmeter, it is easily affected by external electromagnetic interference. Therefore, the vibration source and magnetic source should be avoided as much as possible during installation, and a reliable ground connection should be made. Generally, the grounding resistance is required to be less than 10 ohms. For the installation of explosion-proof products and lightning protection requirements, the grounding resistance should be less than 10 ohms. At the same time, it should be noted that the grounding of the flowmeter cannot be connected to the casing grounding of large electrical equipment, such as transformers, generators, and variable frequency power supplies. Flowmeter manufacturers have many years of professional technical personnel engaged in flow instrument automation and rich experience in after-sales service, providing users with full service of design, production, installation, and debugging. The tenet of the factory's operation for many years is: quality assurance, integrity management, door-to-door service is a shortcut for us to communicate with customers, excellent quality and customer satisfaction. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Analysis on the Influence of Measurement Accuracy of Electromagnetic Flow Meters'
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