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Brief introduction to the importance of the electromagnetic flowmeter grounding ring

1. The role of the electromagnetic flowmeter grounding ring: the grounding ring directly contacts the medium through the grounding electrode, and then grounds the grounding ring and the flange of the electromagnetic flowmeter to reach the ground potential to eliminate interference.

2. The grounding ring of the electromagnetic flowmeter is used: in some occasions, it is not suitable to increase the grounding ring. For example, when measuring strong corrosive medium, the pipe will be made of PVC or PTFE-plated electrode, which is precious metal, especially for large diameter. Say, it is impossible to match the grounding ring, and the cost is too high. In this case, three electrodes are generally selected, two of which are for measurement and the other for grounding.

Generally, if the pipe is made of metal or not with a grounding ring, the flange of the flowmeter and the pipe are connected and then grounded, which can also be used well, especially in the case of large diameter. If you have a small diameter, it doesn't matter if you have a grounding ring, and the cost will not be too much. In addition, some users do not measure strong corrosive media, but the pipeline is non-metallic. At this time, it must be equipped with a grounding ring. Grounding is very important for electromagnetic flowmeters. The interference of the field magnetic field is fatal to the electromagnetic, because the electric field can be shielded by some means, but the magnetic field can't be shielded, so the electromagnetic flowmeter must be installed to avoid the strong magnetic field.

Because the electromagnetic flowmeter signal is weak, only 2.5~8mv at full scale, only a few microvolts when the flow rate is very small, the external interference will affect the measurement accuracy. Therefore, the transmitter casing, shielded wire, measuring conduit and transmission The pipes of the device should be grounded, and the grounding point should be set separately. It must not be connected to the common ground wire or the upper and lower water pipes of the motor and electrical appliances. The converter part has been grounded through the cable, so do not ground again to avoid interference caused by different ground potentials.

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