Outline how to choose appropriate flow meter in the sewage measurement scale

Abstract: an overview of the sewage flow meter scale in measuring how to choose appropriate information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. The introduction of foreign traffic expert F. C。 Kinghoro once said, flowmeter is one of a handful of use than manufacturing difficult instrument. This is because the amount of traffic is a dynamic, internal exists not only in the movement state of liquid viscous friction effect, also can produce. More flow meter manufacturers choose model price quote you are welcome to inquire, here is an overview of the sewage flow meter scale in measuring how to choose appropriate article details. The introduction of foreign traffic expert F. C。 Kinghoro once said, flowmeter is one of a handful of use than manufacturing difficult instrument. This is because the amount of traffic is a dynamic, internal exists not only in the movement state of liquid viscous friction effect, also can produce unstable complex flow vortex and secondary flow phenomena. Measuring instrument itself by many factors, such as pipes, diameter size, shape, Circle, rectangle) Physical properties, boundary conditions and medium ( Temperature, pressure, density, viscosity, dirt resistance, corrosion resistance, etc. ) , the flow of the fluid ( Turbulent flow state, velocity distribution, etc. ) And the influence of installation conditions and levels. Face at home and abroad more than ten classes, hundreds of varieties of flow meter, ( Has developed a positive displacement, the differential pressure type, the vortex street type, area, electromagnetic, ultrasonic and thermal flowmeter types) , according to flow, flow pattern, installation requirements and environmental conditions, economic factors, such as reasonable selection, is the basis and prerequisite for application of well flow meter. In addition to the instrument itself to guaranteed quality, provide process data and instrument installation, use and maintenance is important is whether it is reasonable. In this paper, the frequently used in the sewage flow measurement of electromagnetic vortex type, throttle type flowmeter selection such as design, and combining with the characteristics of wastewater treatment process, from two aspects of theory and practice of their respective characteristics. 1, design of electromagnetic flowmeter type electromagnetic flowmeter since domestic industrial application for the first time since the late 1950 s, and s, apply and develop quickly in the flow measurement. Working principle of electromagnetic flowmeter is based on Faraday's law of electromagnetic induction, that is perpendicular to the lines of magnetic force measured medium flow direction, and with the medium flow and the direction of the magnetic field lines are perpendicular to the induction electromotive force in the EX type: EX - - For the induced electromotive force, V. For the magnetic induction intensity B, T; D is the distance between the two electrodes, mm; υ For the average flow velocity of measured medium, m/s. The measured medium flow rate Q and d ( Equal to D, refers to the distance between the poles) And & upsilon; : by the above two type: when the magnetic field strength B and d must be the distance between the two poles, are: the EX = K× Q（ 4) Among them, K = 4 & times; 10 - 4 /π D, as constant. By type ( 4) , the induced electromotive force measured medium flow (EX and Velocity) Is proportional to the, electromagnetic flowmeter is not affected by external factors such as temperature, pressure, viscosity, density, the influence of the measurements of the interior of the tube extruding part without shrinkage or pressure loss, in addition, the flow element to detect the signal at the beginning of zui, average flow velocity is a fluid into a precise linear change of voltage, it has nothing to do with the other properties of the fluid, has the very big superiority. According to the change of sewage flow, containing impurities, corrosive small, have certain features such as conductive ability, measure sewage flow, the electromagnetic flowmeter is a good choice. Its compact structure, small volume, convenient installation, operation and maintenance, such as measuring system adopts the intelligent design, whole sealing, can work normally under the harsh environment. Can choose neoprene lining, molybdenum stainless steel ( OCrI8Ni12Mo2Ti） Electrode electromagnetic flowmeter, can satisfy the requirement of sewage flow measurement. A smelter in production, due to the needs of the production process, can produce a large number of industrial wastewater, sewage treatment plant must be to monitor the flow of sewage. In the type selection design of the past, many flow meter use vortex flowmeter and the orifice meter. And found in actual application of measuring flow display value and the actual flow deviation is bigger, use electromagnetic flowmeter deviation is greatly reduced. 2, vortex street flowmeter selection of vortex flowmeters are designed as a new type of flowmeter, the rapid development since the mid - 80 - s, it has many advantages and strengths in flow measurement, more and more widely applied in modern flow measurement. In the domestic use of vortex flowmeter in flow measurement will become more and more attention, at present our country has good performance and has independent intellectual property products. Vortex flowmeter is developed based on the fluid vibration, according to different vortex, the detection methods developed gradually from a hot wire type, thermal stress, magnetic susceptibility and differential switch capacitance type, ultrasonic type, etc. Vortex flowmeter can be used for almost everything can form vortex column occasions, not only can be used in a closed pipe, can also be used to open the groove. Compared with the turbine flowmeter, vortex flowmeter without moving mechanical parts, maintenance workload small, instrument constant stability; Compared with the orifice plate flowmeter, vortex flowmeter measurement range, small pressure loss, high accuracy, simple installation and maintenance.

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