Application of Intelligent Electromagnetic Flow Meter in Sewage Treatment Industry

Abstract: The application information of intelligent electromagnetic flowmeter in the sewage treatment industry is provided by excellent flowmeter and flowmeter manufacturers. Intelligent electromagnetic flowmeters have been used for more than 50 years and have been widely used around the world, covering water/sewage, chemical, pharmaceutical, paper, food and other industries. Large-diameter meters are mostly used in water supply and drainage projects. Small and medium calibers are often used. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the application article details of intelligent electromagnetic flowmeters in the sewage treatment industry. Intelligent electromagnetic flowmeters have been used for more than 50 years and have been widely used around the world, covering water/sewage, chemical, pharmaceutical, paper, food and other industries. Large-diameter meters are mostly used in water supply and drainage projects. Small and medium calibers are often used in unmeasured fluids or places with high requirements. Small-caliber and micro-caliber are often used in places with hygienic requirements such as the pharmaceutical industry, food industry, and bioengineering. With the acceleration of China's industrialization process, the problem of environmental pollution is becoming more and more serious, and the society's voice for sustainable development is getting louder and louder. A water treatment company in Zhejiang is an urban comprehensive sewage treatment enterprise that mainly focuses on printing and dyeing industrial wastewater. The completed first and second phase projects have reached a sewage treatment capacity of 700,000 tons/day. Flow measurement is very important because in the sewage treatment process, discharge sewage, additives, sludge, etc. need to be metered and controlled. 1. Measuring principle The working principle of the intelligent electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. When the conductive metal rod moves perpendicular to the direction of the magnetic field line at a certain speed, an induced voltage will be generated. If the magnetic field strength is B, the length of the metal rod is L, and the speed is v, in the intelligent electromagnetic flowmeter, the conductive medium in the measuring tube is equivalent to the conductive metal rod in the Faraday test, and the two electromagnetic coils at the upper and lower ends generate a constant magnetic field. When a conductive medium flows, an induced voltage is generated. Two electrodes inside the pipe measure the induced voltage generated. The measuring tube is electromagnetically isolated from the fluid and the measuring electrode by means of a non-conductive lining (rubber, Teflon, etc.). Assuming that the magnetic field strength (B) generated by the electromagnetic induction coil is constant, the induced voltage (Ue) is proportional to the fluid velocity (v), and the pipe cross-sectional area (A) is known, the volume flow (Qv) can be calculated by the following formula : Intelligent electromagnetic flowmeter consists of two parts: flow sensor and transmitter. The sensor measuring tube is equipped with an excitation coil up and down. After passing the excitation current, a magnetic field is generated to pass through the measuring tube. A pair of electrodes are installed on the inner wall of the measuring tube to contact with the liquid, and the induced potential is drawn out and sent to the transmitter. The excitation current is provided by the transmitter. According to the assembly method of the converter and the sensor, there are two types: separate type and integrated type. In the sewage treatment process, the large-diameter flowmeters are mostly split-type, some of which are installed underground, and the other part is on the ground. Small calibers are mostly integrated. The functions of intelligent electromagnetic flowmeters on the market are also very different. The simple one is to measure one-way flow, and only output analog signals to drive the rear instrument; Power cut off alarm, small signal cut off, flow display and total calculation, automatic check and fault self-diagnosis, communication with upper computer and motion configuration, etc. The serial digital communication function of some models of instruments can choose a variety of communication interfaces and special-purpose chips (ASIC) to connect HART protocol systems, PROFTBUS, Modbus, FF fieldbus, etc. The caliber range of the intelligent electromagnetic flowmeter is wider than other varieties of flow meters. Jinhu Gionee Automation Instrument provides three types of sensors, W, P, and H, which are respectively used in the water and sewage industry (W type), chemical industry, and food industry (P type). ), food, pharmaceutical industry (H type), diameter range from 2 mm to 2 m. The transmitter can provide 10, 50, 23, 53 options, 10 is the economical type developed for the water industry, 50 is the ordinary type, 53 is the enhanced type, and 23 is the two-wire system. Accuracy can be 0.5%, 0.2% two options. It can measure forward and reverse bidirectional flow, and also measure pulsating flow. The premise of using an intelligent electromagnetic flowmeter is that the measured liquid must be conductive and cannot be lower than the threshold (ie, the lower limit). If the conductivity is lower than the threshold, it will cause measurement error until it cannot be used. If it exceeds the threshold, it can be measured even if it changes. The indication error does not change much.×10-6) between S/cm, depending on the model.
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