1. Wiring method of electromagnetic flowmeter

The wiring of electromagnetic flowmeter is divided into two parts, internal wiring and external wiring. The internal wiring generally consists of 5 wires, and the connection between the sensor and the conversion amplifier. XY，ACB， Two wires are connected to the magnetic coil, XY， Electrode wiring ACB, two are electrode wiring AB, and one is grounded C. External wiring is generally the power supply connection terminal. Two wires, signal output lines: six, usually two 4-20mA output lines, two RS232 communication lines, and two RS485 communication lines. There is also a grounding terminal wire on the cylinder. When purchasing and installing a product, it is generally easy to simply open the watch cover and follow the instructions for external wiring, which is not complicated. But if the pipeline is made of all plastic and non-conductive, proper grounding should be done to avoid inaccurate flow or drift. Additional information: The DC magnetic circuit is implemented using permanent magnets, which have the advantages of a relatively simple structure and less interference from AC magnetic fields. However, it is prone to polarize the electrolyte liquid inside the measuring tube, causing the positive electrode to be surrounded by negative ions and the negative electrode to be surrounded by positive ions, resulting in electrode polarization and an increase in internal resistance between the two electrodes, which seriously affects the normal operation of the instrument. When the diameter of the pipeline is large, the permanent magnet is also large, bulky, and uneconomical. Therefore, electromagnetic flow meters generally use alternating magnetic fields and are excited by a 50HZ power supply. There is a complete layer of electrical insulation lining on the inner side of the measuring conduit and the flange sealing surface. It directly contacts the liquid being measured, and its function is to increase the corrosion resistance of the measuring conduit and prevent the induced potential from being short circuited by the metal measuring conduit wall. The lining materials are mostly corrosion-resistant, high-temperature resistant, wear-resistant polytetrafluoroethylene plastics, ceramics, etc. The induced potential signal generated by liquid flow is very weak and 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 and convert the induced potential signal Ex detected by the electrode into a unified standard DC signal. Reference source: Baidu Baike - Electromagnetic flowmeter

2. Open channel box type flowmeter

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