What Should We Do If The Smart Electromagnetic Flow Meter Is Disturbed?

Jul 09 , 2019

According to the characteristics of the general Smart Electromagnetic Flow Meter system, the interference source of the electromagnetic flow meter is mainly discussed from the aspect of hardware optimization. For example, electromagnetic coupling and electrostatic induction are important sources of interference noise generated by the smart electromagnetic flow meter. In an electromagnetic flow transmission, since the leads of the two electrodes are in an alternating magnetic field, an induced electromotive force is generated in the closed loop of the lead when the transmission is energized. This interference signal is superimposed on the measurement signal, which affects the operation of the system. The generation of various excitation methods will bring different electromagnetic interference problems. The DC excitation method is prone to polarization interference, and the AC excitation method is easy to generate orthogonal interference (90-degree interference) and in-phase interference.

Smart Electromagnetic Flow Meter

Orthogonal interference refers to interference that is 90 degrees out of phase with the flow signal. When the intelligent electromagnetic flow transmitter adopts the AC excitation mode, an alternating magnetic field is generated, and the closed loop composed of the electrodes, the lead wires, the measured medium and the input circuit of the converter is in the interference alternating magnetic field. The closed loop cannot be completely parallel with the magnetic field lines generated by the alternating magnetic field of the transmitter. There will always be a part of the alternating magnetic lines of force passing through the closed loop, thereby generating an interference electromotive force in the loop. The two parts of the converter and converter take measures to eliminate or suppress 90° interference.

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