The solution to the bubble noise of the electromagnetic flow meter

Abstract: The information on the solution to the bubble noise of the electromagnetic flowmeter meter is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. The measurement principle of electromagnetic flowmeter is Faraday's law of electromagnetic induction to measure the volume flow of conductive liquids and slurries in closed pipes, including acids, alkalis, salts and other highly corrosive liquids. Most of the false alarms occurred in the electromagnetic flowmeter in the measurement of cooling water in the iron and steel industry. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the solution to the bubble noise of the electromagnetic flowmeter meter. The measurement principle of electromagnetic flowmeter is Faraday's law of electromagnetic induction to measure the volume flow of conductive liquids and slurries in closed pipes, including acids, alkalis, salts and other highly corrosive liquids. Most of the false alarms of electromagnetic flowmeters in the measurement of cooling water in the iron and steel industry are caused by bubbles wiping the electrodes, resulting in a short-term induction signal of zero, which is a cavitation phenomenon, and we call this fault bubble noise. Here are some ways to avoid and solve the bubble noise problem. First of all, the length of the upstream straight pipe section of the electromagnetic flowmeter should be met from the installation, the installation of the instrument should be standardized, the installation site should be selected away from the heat source, the pipeline flow rate should be reasonably used, and the PFA fluoroplastic lining with high finish and the high-purity alumina industrial ceramic conduit should be selected. These measures will help prevent or reduce the occurrence of vortices and gas separation. That is to say, it is possible to avoid problems by improving the sensor manufacturing process, improving the environmental conditions and installation conditions of the instrument, and installing an exhaust valve upstream of the instrument. Secondly, setting the damping time and function of the electromagnetic flowmeter reasonably can also solve the false alarm of bubble noise measurement. The damping time is selected according to the pulse width of bubble noise in the flow signal. Generally, the damping time should be 3 to 5 times the pulse width of the bubble noise. If the bubble noise pulse width is 10s, the damping time should be 30~50s. The specific selection should be based on the required control accuracy, the control error of 3 times the pulse width is 5%, and the control accuracy of 5 times the pulse width is higher than 1%. Increasing the damping time of the meter can effectively solve the impact of this pulsed bubble noise, but also brings the disadvantage of slow response, that is, when the real flow fluctuates, the response of the meter is very slow. This is undoubtedly a problem for cooling water systems that require sensitive control. In order to solve this problem, the intelligent electromagnetic flowmeter can use software logic judgment, that is, the method of gross error processing. When this kind of failure occurs, it is judged whether it is the flow change or the bubbles rubbing the electrode by adjusting the two conditions of the insensitive time of the flow and the limitation of the change range. If it is not the noise of the bubbles rubbing the electrodes, the CPU performs normal sampling, calculation and digital filtering; if it is determined that the noise of the bubbles is generated, the measurement value is cut off and the previous flow measurement value is maintained. In this way, the damping time is still 3~6s during normal flow measurement. Only when there is bubble noise, the insensitive time will be lengthened according to the length of the pulse width setting, and the system control time will also be lengthened. When we reasonably choose the limit value of the rate of change and the insensitive time value of the electromagnetic flow converter with the function of gross error suppression, the converter can not only suppress the false alarm caused by the bubble noise, but also the response speed of the instrument can still maintain the required speed during normal operation. Set the damping time value. The research on the bubble noise of electromagnetic flowmeter should be the simulation test of electromagnetic flow sensor electrode with bubbles, but there is no such condition at present. Therefore, we only use the switching of the electromagnetic flow signal generator signal to simulate the bubble noise. Appropriately select the damping time and the method of the intelligent electromagnetic flowmeter to deal with the bubble noise fault, and observe the change of the flowmeter display and output signal, and judge that the effect of dealing with the bubble noise is obvious. Switch the switch of the standard signal source of the intelligent electromagnetic flowmeter, quickly set the flow rate and zero point, and keep the signal at zero time as needed to simulate the occurrence and existence of bubble noise. Change the damping time of the meter and set different rate limit values ​​and insensitive time values ​​to test the change of the output of the meter. The results show that increasing the damping time and intelligent bubble noise processing can achieve no major changes in the output, and the latter is more conducive to improving the measurement response speed during normal measurement. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'About the solution to the bubble noise of the electromagnetic flow meter'
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