Smart meters SKLD series of smart electromagnetic flow meters use the latest technology in the world. The use of constant-current low-frequency rectangular wave or dual-frequency rectangular wave excitation not only has the advantages of rectangular wave magnetic field, but also overcomes the shortcomings of the sine wave magnetic field; it can also eliminate power supply voltage fluctuations, power supply frequency changes and excitation coil impedance changes caused by Errors; excellent zero stability and immunity to fluid noise interference. Therefore, it has the characteristics of high stability and high reliability. Intelligent electromagnetic flowmeter measurement principle is based on Faraday's law of electromagnetic induction, intelligent electromagnetic flowmeter consists of sensors and converters, sensors installed in the measurement pipeline, the converter can be combined with the sensor combination called the integrated electromagnetic flowmeter, The converter is installed within 30 meters of the sensor or within 100 meters of the sensor. The shielded cable connection between the two is called a separate electromagnetic flowmeter. The main components of the intelligent electromagnetic flowmeter sensor are: measuring tube, electrode, excitation coil, iron core and yoke shell. Intelligent electromagnetic flowmeters are mainly used to measure the volume flow in conductive liquids and slurries in closed pipes. Such as water, sewage, mud, pulp, all kinds of acid, alkali, salt solution, food slurry, etc., intelligent electromagnetic flowmeter is widely used in petroleum, chemical, metallurgy, textile, food, pharmaceutical, paper and other industries and environmental protection, municipal management, Water conservancy construction and other fields.