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When selecting an electromagnetic flowmeter, the following four factors need to be considered: 1. Functions. The basic functions of electromagnetic flowmeters in the domestic market are roughly the same, but those with better quality and more advanced functions offer greater reliability, simplicity, stability, and performance in actual use. When selecting an electromagnetic flowmeter based on its functions, it is necessary to choose one that suits one’s actual application needs – for example, whether it has a remote signal output function or is explosion-proof, etc. It is important to pick a suitable manufacturer of electromagnetic flowmeters as well as the right model of such flowmeter. 2. Liquid conductivity For electromagnetic flowmeters to function, the liquid must be conductive; its conductivity cannot be below a certain threshold. The typical threshold for such flowmeters ranges from 10-4 to 10-6 S/m, and this value depends on the specific model. Organic solvents and petroleum products have low electrical conductivity, so they cannot be measured using electromagnetic flowmeters. Based on experience, the conductivity of the liquid being tested should be at least one order of magnitude higher than the threshold specified by the instrument manufacturer. Otherwise, it is prone to causing shaking. 3. Precision level: Electromagnetic flowmeters with high precision have an error range of approximately ±0.5% to ±1%, while those with lower precision have an error range of around ±1.5% to ±2.5%. The price difference between them is also about twice as much. Therefore, flow meters should be selected appropriately; in applications where high precision is not required, those with lower prices can be used to reduce costs. Some flowmeters offer higher precision, but they require very specific installation conditions, such as a temperature of 20°C to 22°C; in some cases, DC calibration is also necessary to minimize the impact of various factors. 4. Selection of flow rate and diameter The diameter of an electromagnetic flowmeter does not have to match the pipe diameter; it should be determined based on the flow rate. The optimal flow velocity for liquids in pipelines is generally 1.5 to 3 m/s; at such velocities, the diameter of the flow meter can be the same as that of the pipeline. The online flow rate is theoretically unlimited, but if the lining cannot withstand the impact of the fluid, it is recommended not to exceed 5 m/s. For liquids that tend to form deposits and scale, a flow rate of not less than 2 m/s should be used. For more information, please visit the company’s official website at http://www.yb1518.com/. Please keep this link when reproducing the content!