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How to connect the electromagnetic flowmeter?

Author: Release date: 2020-05-18 10:36:36 Source: Shanghai Cixi View: 31
The wiring of electromagnetic flowmeter is divided into two parts, internal wiring and external wiring. The internal wiring is generally 5 wires, and the connection between sensor and conversion amplifier. XY, ACB, that is to say, there are two magnetizing coil wiring, XY, electrode wiring ACB, two electrode wiring AB and one grounding C. The external wiring is generally the power access terminal.
  
Two lines, signal output lines: six, generally two 4-20mA output lines, two RS232 communication lines and two RS485 communication lines. There is also a grounding terminal line on the cylinder body. When you open the external wiring cover, it is not necessary to open the external wiring table. However, if the pipe is all plastic pipe, it should be properly grounded to avoid inaccurate flow or drift.
  
The DC magnetic circuit is realized by permanent magnet. Its advantages are simple structure and less interference by AC magnetic field. However, it is easy to polarize the electrolyte liquid in the measuring tube, so that the positive electrode is surrounded by negative ions, and the negative electrode is surrounded by positive ions, that is, the polarization phenomenon of the electrode, which leads to the increase of the internal resistance between the two electrodes, thus seriously affecting the normal operation of the instrument.
  
When the pipe diameter is large, the permanent magnet is also large, bulky and uneconomical, so the electromagnetic flowmeter generally adopts alternating magnetic field and is generated by the excitation of 50 Hz power supply.
  
There is a complete electrical insulation lining on the inner side of the measuring tube and on the sealing surface of the flange. It directly contacts with the measured liquid and its function is to increase the corrosion resistance of the measuring tube and prevent the induced potential from being short circuited by the metal measuring tube wall. The lining materials are mostly PTFE plastics and ceramics with corrosion resistance, high temperature resistance and wear resistance.
  
The induced electromotive force signal generated by liquid flow is very weak, which is greatly affected by various interference factors. The function of the converter is to amplify and convert the induced potential signal into a unified standard signal and suppress the main interference signal. Its task is to amplify the induced potential signal ex detected by the electrode into a unified standard DC signal

The above is how to connect the electromagnetic flowmeter of Shanghai Cixi? Hope to help you, if you still have related product problems, you can dial the page of the consultation phone! The company provides 24-hour service!

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