Selection and Analysis of Sewage Flow Meters

Abstract: The selection and analysis information of sewage flow meter is provided by the excellent flow meter and flow meter manufacturer and quotation manufacturer. At present, in the measurement of sewage in major enterprises, the sewage flowmeter used in pipeline sewage measurement widely uses electromagnetic flowmeter, and the open channel sewage measurement uses ultrasonic open channel flowmeter. Electromagnetic flowmeters have been used for more than 50 years and have been used all over the world. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the selection analysis article of sewage flowmeters. At present, in the measurement of sewage in major enterprises, the sewage flowmeter used in pipeline sewage measurement widely uses electromagnetic flowmeter, and the open channel sewage measurement uses ultrasonic open channel flowmeter. 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. 1 Measuring principle The working principle of 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 strength of the magnetic field is B, the length of the metal rod is L, and the speed is v, then the induced voltage is: (see the figure below) The working principle of the electromagnetic flowmeter In the electromagnetic flowmeter, the conductive medium in the measuring tube is equivalent to the Faraday test. Conductive metal rod, 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 : 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 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; Cut off alarm, small signal removal, 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 electromagnetic flowmeter is wider than other varieties of flowmeters. Hengruida Instrument Co., Ltd. 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), caliber range from 6 mm to 2 meters. 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 electromagnetic flowmeter is that the liquid to be measured must be conductive and cannot be lower than the threshold (ie lower limit). If the conductivity is lower than the threshold value, it will cause measurement error until it can not be used. If it exceeds the threshold value, it can be measured even if it changes. The indication error does not change much.×10-6) between S/cm, depending on the model. The use also depends on the length of the flow signal line between the sensor and the converter and its distributed capacitance. The manufacturer's instruction manual usually specifies the length of the signal line corresponding to the conductivity. The electrical conductivity of industrial water and its aqueous solution is greater than 10-4S/cm, and the electrical conductivity of acid, alkali and salt solution is between 10-4 and 10-1S/cm. There is no problem in use. Low-degree distilled water is 10-5S/cm cm is also not a problem. Electromagnetic flowmeters cannot measure liquids with very low conductivity, such as petroleum products and organic solvents. Gases, vapors and liquids with many larger bubbles cannot be measured. It is found from the data that some pure liquids or aqueous solutions have low conductivity and are considered unusable. However, in practical work, there will be instances where they can be used because they contain impurities. Such impurities are beneficial to increase the conductivity. For the aqueous solution, the conductivity in the data is measured in the laboratory with pure water. The actual aqueous solution may be proportioned with industrial water, and the conductivity will be higher than that found, which is also beneficial for flow measurement.

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