False alarm of electromagnetic flow meter in cooling water measurement in iron and steel industry

Abstract: The false alarm information of electromagnetic flow meter in the measurement of cooling water in the iron and steel industry is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. Electromagnetic flowmeter There is a false alarm in the measurement of cooling water in the steel industry. What is this willing? After a long period of practical experience, we found that most of the false alarms of electromagnetic flowmeters are caused by air bubbles wiping the electrodes. How to solve this problem? First of all. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the false alarms of electromagnetic flowmeters in the measurement of cooling water in the iron and steel industry. The electromagnetic flowmeter has a false alarm in the measurement of cooling water in the steel industry. What is this willing to do? After a long period of practical experience, we found that most of the false alarms of electromagnetic flowmeters are caused by air bubbles wiping the electrodes. How to solve this problem? First of all, it is necessary to meet the length requirements of the upstream straight pipe section of the instrument from the installation, standardize the installation of the instrument, choose the installation site far away from the heat source, use the pipeline flow rate reasonably, choose the PFA fluoroplastic lining with high smoothness and the high-purity alumina industrial ceramic conduit. 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. 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 [5]. 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 bubble rubbing the electrode, the CPU performs normal sampling, calculation and digital filtering; if it is determined that the bubble noise is generated, the measured value is cut off and the previous flow measurement value is maintained. In this way, the damping time is still 3 to 6 s 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. Secondly, setting the damping time and function of the instrument 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%. When we reasonably choose the electromagnetic flow converter with gross error suppression function“rate of change limit”and“insensitive time value”, 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 set damping time value during normal operation. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Electromagnetic flow meter in the steel industry cooling water measurement false alarm'
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