Vortex flowmeter is a new type of flowmeter developed based on the principle of Karman vortex street. It is mainly used for flow measurement of medium fluids in industrial pipelines, such as gases, liquids, vapors and other media. Its characteristics are low pressure loss, large range, high precision, and almost no influence of parameters such as fluid density, pressure, temperature, and viscosity when measuring volume flow. Because vortex flowmeters have advantages that other flowmeters do not have, they have developed rapidly since their inception. According to statistics, the proportion of vortex flowmeters used in developed countries such as Japan, Europe and the United States has increased dramatically, and it has been widely used in various fields. From this trend, vortex flowmeters will dominate the future flow meters and are ideal replacements for orifice flowmeters. First, introduce the advantages of vortex flowmeters:
1, the structure is simple and solid, no moving parts, long-term operation is very reliable;
2, maintenance is very convenient, low installation costs;
3, the sensor does not directly contact the media, stable performance, long life;
4, the output is proportional to the flow rate of the pulse signal, no zero drift, high precision, and convenient and computer networking;
5, wide measurement range, up to 1:10 ratio;
6, small pressure loss, low operating costs, more energy-saving significance;
7. Within a certain range of Reynolds number, the output signal frequency is not affected by the physical properties of the fluid and composition changes. The meter coefficient is only related to the shape and size of the vortex generator. The volume flow of the measurement fluid does not need to be compensated. Calibration of the coefficient of the instrument;
8, a wide range of applications, gas, liquid flow can be measured;
9. The verification period is 2 to 4 years.
Vortex flowmeters have many advantages and are also suitable for the measurement of flow in various conditions. For vortex flowmeter selection and installation there is a great deal of knowledge. When people choose and install vortex flowmeters, they should consider the following aspects:
1, because the vortex flowmeter is a speed type flowmeter, the stability of the vortex separation is affected by the flow rate, so it has certain requirements for the straight section, generally the first 10D, after the 5D;
2. When the liquid is measured, the upper limit flow rate is limited by pressure loss and cavitation, generally 0.5 ~ 8m / s;
3, when measuring gas, the upper limit flow rate is limited by changes in the compressibility of the medium, the lower limit flow rate is limited by the Reynolds number and the sensitivity of the sensor, steam is 8 ~ 25m / s;
4, due to stress-type vortex flowmeter is more sensitive to vibration, so in the vibration of the pipeline installed flowmeter, the pipeline must have a certain amount of shock absorption measures;
5, because the stress type vortex street flowmeter uses the piezoelectric crystal as the detection sensor, so it is limited by the temperature, generally - 40 ~ +300 °C.
In addition, many troubles in the installation of vortex flowmeters require long straight sections before and after, which can increase the user's installation cost and are also easily limited by the site. However, there are already some manufacturers that can provide a design that reduces the diameter inside the flowmeter. This design greatly reduces the need for the user to have a straight section of the Vortex Flowmeter, which saves a lot of installation costs for the company.
Extended reading: Flowmeter Mingyu Automation
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