The fluid to be tested must be a conductive liquid or slurry with a conductivity of not less than 50μS/cm, and the fluid to be tested should not contain many ferromagnetic substances or bubbles.
The appropriate pressure level, lining material, electrode material and instrument structure should be selected according to the characteristics of the fluid to be measured.
1. Because the electromagnetic flowmeter has a high range of 1500:1, the diameter of the instrument is usually the same as that of the process pipeline.
2. If the measured medium contains solid particles, the recommended flow rate range is 1 - 3m/s. If the actual flow rate is too large and it is inconvenient to change, the diameter of the optional instrument is larger than that of the process pipeline.
To reduce the flow rate of the fluid in the measuring pipe section of the flowmeter properly, reduce the wear of the particles on the electrode and the lining.
3. If there may be sediment in the process pipeline, the recommended flow rate is 2-5m/s. If the actual flow rate is too small and it is inconvenient to change the process pipeline, the optional instrument with a small diameter
According to the diameter of the process pipeline, the fluid flow rate of the flowmeter can be appropriately increased to avoid the influence of sediment on the accuracy of the meter.
4. When the flow rate is too small and high-precision measurement is required, a sensor smaller than the diameter of the process pipeline can be selected to increase the flow rate and ensure higher accuracy.
In the above 2, 3, and 4 cases, reducers must be installed upstream and downstream of the flowmeter. The central cone angle of the reducer should not be greater than 15°, and there should be at least a straight pipe section upstream of the reducer that is five times the diameter of the process pipe.