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Why should the electromagnetic flowmeter be grounded?

Regarding the grounding of the electromagnetic flowmeter, the share in the self-control knowledge system is small. Can be skilled in citing the norms, there are many people who use the rules, but they can say that there are not many reasons. This is actually a habit of thinking. After learning the multiplication, we seldom care about the relationship between multiplication and addition, but we don't make mistakes because this knowledge has already melted into the blood. However, the study of some professional knowledge often lacks the practice of cultivating conditioning before the college entrance examination, so the conclusions are often remembered and the reasons are ignored.

Ask a question first when discussing grounding. What is the grounding?

The various grounding protection groundings, shielding grounding, working grounding, signal grounding, etc., which we usually say, are all functions that need to be done by grounding.

Evacuation of electromagnetic interference, lightning protection, protection of personal safety, ..., etc., etc., are all said to be achieved through grounding.

What is the grounding itself?

The grounding is essentially to establish an earth-based equipotential between the various points of the circuit as needed. For example, if the electrical leakage occurs, the potential of the leakage can be forced to be equal to the position of the human body through the grounding. The equipotential is formed between the leakage and the position of the human body, so that there is no current without the potential difference, and people will not get an electric shock. Therefore, there is a protective grounding that can protect personal safety; the electromagnetic field interferes with the signal, and there is a process of electromagnetism, magnetoelectricity, and electrical regenerative magnetic... The use of metal shielding can weaken the transmission of interference, but not necessarily to a satisfactory level. By grounding, the electricity generated by the interference on the shield layer is forced to the potential at which the signal is zero, and the equipotential is achieved. Without the potential difference, interference can be considered as no for the signal. Then there is the shield grounding through the ground leakage bleed; the control signal, if there is no unified reference point, there will be a situation where the 1-5V issued by the meter is considered to be 2-6V by the b meter, and the problem is solved. The method is to provide a common reference point for all meters. This has the working ground of the instrument; we plan the grounding, in fact, it is necessary to establish equipotentials for those points, how to connect is most beneficial to establish equipotential, and when the equipotential is established to deviate from the ground reference potential Coordination of countermeasures and tolerance.

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