Coriolis Mass Flow Meter

Primary Factors Affecting Measurement Performance & Solutions

2． Environmental Vibration and Electromagnetic Interference

When the mass flow meter is working normally, the measuring tube is in a state of vibration and is very sensitive to external vibration. If there are other vibration sources on the same supporting platform or nearby areas, the vibration frequency of the vibration source will affect each other with the working vibration frequency of the mass flow meter measuring tube, causing abnormal vibration and zero drift of the flow meter, causing measurement errors. It will cause the flow meter to not work; at the same time, because the sensor vibrates the measuring tube through the excitation coil, if there is a large magnetic field interference near the flow meter, it will also have a greater impact on the measurement results.

Solution: With the continuous improvement of mass flow meter production technology and technology, for example, the application of DSP digital signal processing technology and MVD technology of Micro Motion, compared with previous analog equipment, the front end The digital processing greatly reduces the signal noise and optimizes the measurement signal. The flow meter with the above functions should be considered as limited as possible when selecting the instrument. However, this does not fundamentally eliminate the interference. Therefore, the mass flow meter should be designed and installed away from large transformers, motors and other devices that generate large magnetic fields to prevent interference with their excitation magnetic fields.

When vibration interference cannot be avoided, isolation measures such as a flexible pipe connection with the vibration tube and a vibration isolation support frame are adopted to isolate the flow meter from the vibration interference source.