Comparison of Functions between Ultrasonic Flowmeters and Electromagnetic Flowmeters 

   Ultrasonic flowmeters and electromagnetic flowmeters are both universal high-precision measuring instruments that have been recognized by the China Technical Supervision and Inspection and Quarantine Administration and other corresponding international testing institutions.

Features of electromagnetic flowmeters:

1) The sensor structure of the electromagnetic flowmeter is simple. There are no moving parts in the measuring pipe, and there are no any throttling components that hinder the flow of the fluid.

2) It can measure dirty media, corrosive media, and suspensive liquid-solid two-phase flows. It cannot measure non-conductive fluids.

3) The output of the electromagnetic flowmeter is only proportional to the average flow velocity of the measured medium.

4) The electromagnetic flowmeter has no mechanical inertia and can measure instantaneous pulsating flow as well as the flow in both forward and reverse directions.

5) The accuracy is 0.5 grade. After laboratory calibration, it can reach 0.25 grade.

6) The electromagnetic flowmeter is prone to electromagnetic interference. There is zero drift, and it needs to be calibrated once every two years.

7) The installation of the electromagnetic flowmeter is complex. The supporting equipment requires expansion joints and control valves.

Features of ultrasonic flowmeters:

1) There are no moving parts in the flowmeter installation pipe section, which will not hinder the flow of the fluid.

2) It is not affected by the conductivity, temperature, and pressure of the measured medium.

3) Lateral flow correction.

4) The measuring pipe diameter range is wide, from small pipes with a diameter of 0.25 meters to large pipes with a diameter of 20 meters.

5) The flow rate range is wide, from 0.02 m/s to 20 m/s, and it meets the requirements for measurement accuracy.

6) It can measure bidirectional flow, has a temperature measurement function, can calibrate the flow velocity, and has a self-diagnosis function.

7) It can be calibrated online in a dry state.

8) Ultrasonic flowmeters can be installed, maintained, and calibrated online without water interruption. The maintenance is simple and does not affect production or use. 

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