Flow meter selection | Clamp on electromagnetic flow meter selection

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1. How to select Emerson flow meters based on pipe diameter? Emerson flow meters are mainly selected based on the type of flow meter and the actual flow range. The core is to match the pipe diameter with the flow range to avoid a decrease in measurement accuracy or equipment damage caused by improper pipe diameter. 1. The range of pipe diameters and the type of flow meter are compatible with Emersons mainstream flow meters. The range of pipe diameters is different. The Coriolis flow meter is suitable for small pipe diameters, usually DN6-DN200 (1/4 inch -8 inches). Based on the principle of Coriolis force, it has high measurement accuracy for fluid density and mass flow, and is commonly used for small flow additive transportation in the chemical industry. Electromagnetic flowmeter: suitable for a wide range of pipe diameters, from DN6-DN3000 (1/4 inch -120 inches), using the principle of electromagnetic induction to measure the volumetric flow rate of conductive liquids. Large pipe diameters are used for water supply and drainage, sewage treatment, and small pipe diameters are used for accurate control in industries such as pharmaceuticals and food. • Vortex flowmeter: The common pipe diameter is DN15-DN300 (1/2 inch -12 inches), based on the Karman vortex principle, suitable for measuring gases, vapors, and low viscosity liquids. It is widely used in industrial process gas flow measurement.

2. The matching of pipe diameter and flow range requires the selection of pipe diameter according to the actual flow rate size: • Choosing a larger pipe diameter: If the actual flow rate is lower than the lower limit flow rate of the flowmeter, it will lead to a decrease in measurement accuracy or inability to measure norma

lly. For example, using a large pipe diameter flowmeter for small flow processes in small food processing plants may result in inaccurate measurement. • Choosing a smaller diameter: If the fluid flow rate is too fast, it may increase the pressure loss of the pipeline and damage the flowmeter. For example, choosing a smaller diameter for a high-pressure gas delivery system may cause the gas flow rate to be too high, resulting in a significant pressure drop and affecting system operation.

3. Considering the diameter of the process pipeline, it is preferred to choose a flowmeter with the same diameter as the process pipeline to reduce installation costs and resistance losses. If the diameter of the process pipeline is special and does not fully match the flow meter, it can be connected through a variable diameter pipe fitting, but attention should be paid to the impact of the flow rate change after the variable diameter on the measurement accuracy.

2. Selection of clamp type electromagnetic flowmeter

The selection of clamp type electromagnetic flowmeter needs to be comprehensively considered from three aspects: measurement medium, temperature and pressure range, and measurement range. Specifically, the preliminary selection of measurement medium should be based on the characteristics of the measured medium on site, and the type of medium (such as liquid, gas, or mixed medium) and whether there are corrosive components or other special substances should be confirmed.

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