Selection of Vortex Flow Meters

Abstract: The selection information of the vortex flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. As a new type of flowmeter, vortex flowmeter has developed rapidly since the mid-1980s. It has many advantages and advantages in flow measurement, and is more and more widely used in modern flow measurement. The use of vortex flowmeters for flow measurement in China is also more frequent. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the selection articles of vortex flowmeters. As a new type of flowmeter, vortex flowmeter has developed rapidly since the mid-1980s. It has many advantages and advantages in flow measurement, and is more and more widely used in modern flow measurement. The use of vortex flowmeters for flow measurement in my country has also been paid more and more attention. At present, there are product series with excellent performance and independent intellectual property rights in China. Vortex flowmeter is developed based on fluid vibration. According to the difference of vortex, the detection method has gradually developed from hot wire type, thermal type to stress type, magnetic sensitive type, differential switched capacitive type, ultrasonic type, etc. Vortex flowmeters can be used in almost all occasions where a vortex column can be formed, not only in closed pipes, but also in open grooves. Compared with the turbine flowmeter, the vortex flowmeter has no moving mechanical parts, the maintenance workload is small, and the instrument constant is stable; compared with the orifice flowmeter, the vortex flowmeter has a large measuring range, small pressure loss and high accuracy , easy to install and maintain. However, there are many environment-related parameters of the vortex flowmeter, which are easily ignored in the use site and affect the correct performance of the flowmeter. The principle of the vortex flowmeter is to set a stagnation piece in the flowmeter pipeline. When the fluid flows through the stagnation piece, due to the stagnation effect on the surface of the stagnation piece, there will be two asymmetric columns downstream of the flowmeter. Vortex, these vortices are separated on the side and rear of the stagnation member, forming the so-called Karman vortex row, the rotation direction of the two rows of vortices is opposite, Karman theoretically proved that when h/L=0.281 (h is the two vortices) The width between the columns, L is the distance between two adjacent vortices), the vortex column is stable Reynolds number Re is a dimensionless number that characterizes the flow characteristics of viscous fluids, and its physical meaning is the inertial force of fluid flow and viscosity. Ratio of hysteresis. Therefore, the flow state of the fluid also has a certain influence on the use of the vortex flowmeter. If the environmental parameters have an influence on the fluid flow state, it will also affect the performance of the vortex flowmeter. After practice, the following aspects have an impact on the use of vortex flowmeters, and these problems should be analyzed. The measurement range of the vortex flowmeter is large, generally 10:1, but the lower limit of measurement is limited by many factors: Re>10000 is the most basic condition for the vortex flowmeter to work. In addition, it is also limited by the vortex energy, the medium When the flow rate is low, the strength and rotation speed of the vortex are also low, and it is difficult to cause the sensor element to generate a response signal, and the vortex frequency f is also small, which also makes signal processing difficult. The upper limit of measurement is limited by the frequency response of the sensor (such as the magnetic sensitive type generally does not exceed 400Hz) and the frequency of the circuit. Therefore, the flow rate range must be calculated and calculated during the design, and selected according to the flow rate of the fluid. The environmental conditions of the use site are complex. In addition to the environmental temperature, humidity, atmosphere and other conditions, electromagnetic interference should also be considered when selecting models. In strong interference such as high-voltage power transmission stations, large-scale rectifiers, etc., magnetic-sensitive, piezoelectric stress-type and other instruments cannot work normally or cannot measure accurately. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Selection of Vortex Flow Meters'

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