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How to choose the caliber of the electromagnetic flowmeter according to the working conditions

The selected instrument diameter is not necessarily the same as the pipe diameter and should be determined by the flow rate. The process industry transports liquids with different viscosities such as water. The flow rate of the pipeline is generally 1.5 to 3 m/s. EMF is used on such a pipe, and the sensor diameter is the same as the pipe diameter.
When the electromagnetic flowmeter is full flow rate, the liquid flow rate can be selected within the range of 1 to 10 m/s, and the range is relatively wide. The upper limit flow rate is not limited in principle, but it is generally recommended not to exceed 5 m/s unless the lining material can withstand scouring, and practical applications rarely exceed 7 m/s, and more than 10 m/s is even more rare. The minimum flow rate for full flow is typically 1 m/s, and for some models it is 0.5 m/s. In some pipelines with low flow rate or low flow rate at the beginning of new construction, from the perspective of measurement accuracy, the gauge diameter should be changed to less than the diameter of the pipe and connected by a reducer.
It is used for fluids with easy adhesion, deposition, scaling and other materials. The flow rate is not less than 2m/s, preferably increased to 3-4m/s or above, which can be used for self-cleaning and adhesion prevention. For fluids with high abrasiveness such as pulp, the flow rate should be less than 2~3m/s to reduce the wear on the lining and the electrode.
When measuring a low conductance liquid close to the threshold, select a lower flow rate (less than 0.5 to 1 m/s) as much as possible, and the flow noise will increase due to the flow rate increase, and output sloshing will occur.
The range of the electromagnetic flowmeter is relatively large, usually not less than 20, and the meter with automatic range switching function can exceed 50-100.
Domestically available styling products range in size from 10mm to 3000mm, although the actual application is mostly in medium and small caliber, but with most other principle flow instruments (such as volumetric, turbine, vortex or Coriolis mass, etc.) Compared to large-diameter instruments, they account for a large proportion. Among the nearly 10,000 instruments in a company, the small diameter below 50mm, the medium diameter of 65~250mm, the large diameter of 300~900mm, and the super large diameter of 1000mm or more account for 37%, 45%, 15% and 3% respectively.

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