Sewage measurement meter scale selection

Abstract: wastewater measurement meter scale lectotype attention information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. A traffic expert F. C。 King horo 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 spiral. More flow meter manufacturers choose model price quote you are welcome to inquire, here is water measurement meter scale selection attention to details. A traffic expert F. C。 King horo 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 of steam flowmeter, 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 ( Successively developed volumetric, differential pressure type, turbine, 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. 1. Vortex street flowmeter lectotype design as a new type of flowmeter, vortex flowmeter 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. But the environment related parameters of vortex flowmeter is more, easy to be ignored at the scene of the use and influence the properties of flowmeter play correctly. Measuring principle of vortex flowmeters are in the pipeline flow meters, steam flowmeter set a stagnation, when the fluid flows through stagnation parts, due to the effect on the surface of the viscous flow of viscous flow, in its downstream will produce two columns of asymmetric vortex, the vortex in the stagnation of suitability, apart form the so-called Carmen ( Karman） Spiral columns, two columns of spiral direction of rotation is opposite, Carmen is theoretically proved that h/L = 0. 281 ( H as the width between the two spiral columns, L is the distance between two adjacent vortex) , the spiral column is stable, in this case, produce the vortex frequency f and flowmeter in the pipeline fluid velocity & upsilon; The relationship is: f = sv/d ( 5) v = df / s ( 6) Type d & ndash; — The diameter of the cylindrical viscous flow pieces; s— — Zero number, called the Strouhal number, related to the state of the fluid flow Reynolds number Re.
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