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The electromagnetic flowmeter selects and decides the description according to the flow rate.

In the selection of electromagnetic flowmeters, the choice of caliber should be selected according to actual needs. The gauge diameter does not have to be consistent with the diameter of the pipe, and should be selected and determined according to the flow.
For liquids of different viscosities, the flow rate in the pipe is typically an economical flow rate of 1.5 to 3 m per second. In such a pipeline, the sensor diameter of the electromagnetic flowmeter can be the same as the diameter of the pipe. The flow rate of the electromagnetic flowmeter at full flow can be selected from 1 to 10 m per second.
The media upper flow rate is not limited, but it is best not to exceed 5 m per second unless the lining material of the electromagnetic flow meter can withstand the flushing of the flow.
The classification of electromagnetic flowmeters can be classified from different angles according to the general-purpose and special-type instruments.
According to the way of the excitation current, the electromagnetic flowmeter can be divided into DC excitation, AC excitation, low frequency rectangular wave excitation and dual frequency rectangular wave excitation. The electromagnetic flowmeter mainly has a four-wire system and a two-wire system according to the manner in which the output signal is connected and the excitation connection is in a standard manner. If classified according to the way the converter and sensor are assembled, it can be divided into a split type and an integrated type. Classified by flow sensor and pipe connection methods, with flange connection, flange clamp connection, sanitary connection and threaded connection.
It is important to confirm the range of the electromagnetic flowmeter. The flow rate of the measured medium is 2~4m/s. It is suitable to use the general industrial electromagnetic flowmeter. In special cases, the maximum should be no more than 8m/s and not less than 0.2m/s. If the medium contains solid particles to prevent excessive lining and electrode friction, the flow rate should be less than 3m / s. For magnetically viscous fluids, a larger flow rate helps to automatically eliminate the sticking of adhering electrodes on the electrode and can be selected to be greater than 2 m/s. When the range is timed, the size of the flowmeter diameter D can be determined according to the range of the flow velocity V described above. The formula is: Q=πD2V/4 Q: Flow rate (m2/h) D: Pipe inner diameter V: Flow rate (m/h).

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