Common Models of Electromagnetic Flowmeter

Electromagnetic flowmeters are often used in the industrial field. They are indispensable and important instruments for the measurement of conductive water such as sewage/wastewater. So how should electromagnetic flowmeters be selected? What are the meanings of different electromagnetic flowmeter models? I believe that many friends have this kind of question. The following editor will give you a specific introduction about the common models of electromagnetic flowmeters and the selection of electromagnetic flowmeters.　　 First of all, because the common models of electromagnetic flowmeters are inseparable from the selection of electromagnetic flowmeters, the editor will first talk about the key points that need to be paid attention to when selecting electromagnetic flowmeters.　　1. The choice of temperature and pressure 　　The fluid pressure and temperature that the electromagnetic flowmeter can measure is limited. When selecting, the working pressure must be lower than the working pressure specified by the flowmeter. At present, the working pressure specifications of domestically produced electromagnetic flowmeters are: less than 50mm diameter, working pressure is 1.6MPa; 900mm diameter, working pressure is 1MPa; greater than 1000mm diameter, working pressure is 0.6MPa. The operating temperature of the electromagnetic flowmeter depends on the lining material used, and is generally 5-70°C. If special treatment is done, it can exceed the above range, such as the wear-resistant and corrosion-resistant electromagnetic flowmeter produced by Tianjin Automation Instrument No. 3 Factory. The transmitter allows the temperature of the measured medium to be -40 to 130°C.　　2. Selection of caliber and range　　The transmitter caliber is usually the same caliber as the piping system. If the piping system needs to be designed, the caliber can be selected according to the flow range and flow rate. For electromagnetic flowmeters, the flow rate is more suitable to be 2-4m/s. In special cases, such as solid particles in the liquid, considering the abrasion, the usual flow rate ≤ 3m/s can be selected, for fluids that are easy to attach and manage. Optional flow rate ≥ 2m/s. The range of the transmitter can be selected according to two principles: one is that the full scale of the instrument is greater than the expected maximum flow value; the other is that the normal flow is greater than 50% of the full scale of the instrument to ensure a certain measurement accuracy. 3. Selection of lining material and electrode material The lining material and electrode material of the transmitter must be selected correctly according to the physical and chemical properties of the medium, otherwise the instrument will be damaged quickly due to the corrosion of the lining and electrode, and it is very corrosive Once the medium leaks, it is easy to cause accidents. Therefore, the electrode and lining materials must be carefully selected according to the specific measurement medium in the production process.　　 After talking about the electromagnetic flowmeter selection, the common electromagnetic flowmeter models are relatively simple. An electromagnetic flowmeter selection table is attached, and the specific model of the electromagnetic flowmeter is below. It should be noted that the common model representation of electromagnetic flowmeters of different manufacturers may be different, and specific analysis needs to be combined with specific conditions, but the selection points of electromagnetic flowmeters are the same, as long as you have mastered the electromagnetic flowmeter selection method , The appropriate electromagnetic flowmeter model can be selected.

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