Factors Affecting The Measurement Accuracy Of Electromagnetic Flowmeter

Electromagnetic flow transmitters play an important role in wastewater and sewage measurement. However, some factors may lead to deviation of measurement data or even damage to the mag flow meter. The following is an analysis of the factors affecting the measurement accuracy of the mag flow meter and how to solve these problems.

1. The measured liquid contains air bubbles. This phenomenon is very common, mainly due to external suction and internal dissolution caused by it. However, the electromagnetic flow meters can not distinguish between the liquid and bubbles. So, it will lead to the magnetic flow transmitter measurement results having errors. In such a case, you can change the installation position of the electromagnetic flow transmitters. If the installation site of the magnetic digital flow meter water is not easily replaceable, install an air collector upstream of the electromagnetic flow meters and vent it periodically.

2. The liquid in the pipeline is not full, or the pipeline is filled with a large number of air bubbles above the liquid. This situation will also affect the measurement accuracy of the mag flow meter. If the measured liquid does not pass through the electrodes of the mag flow meter, the measurement results will produce errors.

3. Gradual deposition of conductive material can lead to short-circuiting of the flow signal, thus affecting the measurement of the digital water flow transmitter. For the above problems, please disassemble the electromagnetic digital flow meter water and clean most of the insulation that appears brown rust.

4. Crystallisation of the measured medium can also affect the measurement results of the electromagnetic digital flow meter water. In this case, it is necessary to choose the magnetic flow transmitter with a smaller measuring tube. It should not choose the mag flow meter with installation requirements that are too complex.

5. If the liquid conductivity exceeds the permissible range of the magnetic flow transmitter, the electromagnetic flow meters will not work. For this problem, replace the tantalum electrode, and the electromagnetic flow meters can work normally.

6. Space electromagnetic interference. A long cable between the sensor and the converter or strong electromagnetic interference in the surrounding area can affect the measurement results of the mag flow meter. In this case, first of all, please try to stay away from the strong magnetic field. Then, shorten the cable length as much as possible and take shielding measures.

7. Asymmetric flow of the measured fluid. Asymmetric flow of the measured fluid. If the measured medium has a non-axisymmetric velocity distribution, and when the cyclotron current occurs, it will cause the mag flow meter to produce a measurement error. Therefore, it should take some measures to avoid this situation. Firstly, there are enough straight pipe sections upstream to ensure that the current velocity distribution is in concentric circles. In addition, the inner diameter of the magnetic digital flow meter water should be the same as the inner diameter of the pipe within a certain range upstream and downstream.