How to isolate the vortex flowmeter when it encounters electromagnetic fields

Abstract: The information on how to isolate the vortex flowmeter meter in the electromagnetic field is provided by the excellent flowmeter and flowmeter production and quotation manufacturers. The shielding of the magnetic field is a problem with both practical and theoretical significance. According to different conditions, the shielding of electromagnetic field can be divided into three situations: electrostatic shielding, magnetostatic shielding and electromagnetic shielding. These three situations have both qualitative differences and characteristics. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the article details on how to isolate the vortex flowmeter when encountering electromagnetic fields. The shielding of the magnetic field is a problem with both practical and theoretical significance. According to different conditions, the shielding of electromagnetic fields can be divided into three situations: electrostatic shielding, magnetostatic shielding and electromagnetic shielding. These three situations have both qualitative differences and inherent characteristics, which cannot be confused. Electrostatic shielding is in the state of electrostatic equilibrium, whether it is a hollow conductor or a solid conductor; no matter how much the conductor itself is charged, or whether the conductor is in an external electric field, it must be an equipotential body, and its internal field strength is zero, which is the theoretical basis of electrostatic shielding . Because the electric field in a closed conductor shell has typical and practical significance, we take the electric field in a closed conductor shell as an example to discuss electrostatic shielding. (1) The electric field inside the closed conductor shell is not affected by the charge or electric field outside the shell. If there is no charged body in the shell and there is a charge q outside the shell, the outer wall of the shell is charged by electrostatic induction. There is no electric field in the shell at electrostatic equilibrium. This is not to say that charges outside the shell do not generate an electric field inside the shell, the root generates an electric field. Since the outer wall of the shell induces opposite-sign charges, the combined field strength excited by them and q at any point in the inner space of the shell is zero. Therefore, the inside of the conductor shell will not be affected by the charge q or other electric fields outside the shell. The induced charge on the outer wall of the shell plays an autoregulatory role. If the above-mentioned cavity conductor casing is grounded, the positive charges induced on the casing will flow into the ground along the ground wire. After electrostatic equilibrium, the cavity conductor is equal to the ground, and the field strength in the cavity is still zero. If there is charge in the cavity, the cavity conductor is still equipotential with ground, and there is no electric field in the conductor. At this time, there is an electric field in the cavity because there are induced charges of different signs on the inner wall of the cavity. This electric field is generated by the charge inside the shell, and the charge outside the shell still has no effect on the electric field inside the shell. It can be seen from the above discussion that the internal electric field is not affected by the electric charge outside the casing regardless of whether the closed conductor casing is grounded or not. (2) The external electric field of the grounded closed conductor shell is not affected by the electric charge in the shell. If there is a charge q in the cavity inside the shell, because of electrostatic induction, the inner wall of the shell has an equal charge of the same sign, the outer wall of the shell has an equal charge of the same sign, and an electric field exists in the outer space of the shell, which can be said to be indirectly caused by the charge q in the shell produce. It can also be said that it is directly generated by the induced charge outside the shell. But if the shell is grounded, the charge outside the shell will disappear, and the electric field generated by the charge q in the shell and the induced charge on the inner wall will be zero outside the shell. It can be seen that if the electric charge inside the shell has no effect on the electric field outside the shell, the shell must be grounded. This is different from the first case. It should also be noted here: ① We say that grounding will eliminate the charge outside the shell, but it does not mean that the outer wall of the shell must be uncharged in any case. If there is a charged body outside the shell, the outer wall of the shell may still be charged, regardless of whether there is a charge inside the shell. ② In practical applications, the metal shell does not need to be completely closed, and the metal mesh cover can be used instead of the metal shell to achieve a similar electrostatic shielding effect, although this shielding is not complete and thorough. ③ During electrostatic equilibrium, no charge flows in the ground wire, but if the charge in the shielded shell changes with time, or the charge of the charged body near the shell changes with time, there will be current in the ground wire. . Residual charges may also appear in the shield, and the shielding effect will be incomplete and incomplete. In a word, whether the closed conductor shell is grounded or not, the internal electric field is not affected by the charge and electric field outside the shell; the electric field outside the grounded closed conductor shell is not affected by the electric charge in the shell. This phenomenon is called electrostatic shielding. Electrostatic shielding has two meanings: one is practical meaning: shielding makes the instrument or working environment in the metal conductor shell not affected by the external electric field, nor does it affect the external electric field. In order to avoid interference, some electronic devices or measuring equipment must implement electrostatic shielding, such as grounded metal covers or dense metal mesh covers on indoor high-voltage equipment covers, and metal shells for electronic tubes. Another example is a power transformer used for full-wave rectification or bridge rectification, and a metal sheet is wrapped between the primary winding and the secondary winding or a layer of enameled wire is wound and grounded to achieve shielding. In high-voltage live work, workers wear pressure-equalizing suits woven with metal wires or conductive fibers, which can shield and protect the human body. In electrostatic experiments, there is a vertical electric field of about 100V/m near the earth. To exclude the effect of this electric field on electrons and study the motion of electrons only under the action of gravity, eE

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