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technical article
Characteristics of vortex flowmeter
2011-7-12 16:08:56

Vortex flowmeter is a new type of internationally advanced flowmeter developed based on Carmen's vortex street principle. Because it has the advantages that other flowmeters cannot have, it has developed rapidly since the 1980s. According to related Data show that the proportion of vortex flowmeters in developed countries such as Japan, Europe and the United States has increased sharply. It has been widely used in various fields and will dominate the future flow meters. It is the most ideal alternative to orifice flowmeters . One of the most popular flowmeters in the country.

1. Characteristics of vortex flowmeter :

Simple and solid structure, no moving parts, high reliability and very reliable long-term operation;

Simple installation and convenient maintenance;

Detection sensor does not directly contact the medium, stable performance and long life;

The output is a pulse signal proportional to the flow rate, no zero drift, high accuracy, and convenient networking with a computer;

Wide measuring range and range ratio up to 1:10;

Small pressure loss, low operating cost, and more energy-saving significance;

Within a certain Reynolds number range, the output signal frequency is not affected by the fluid physical properties and component changes. The meter coefficient is only related to the shape and size of the vortex generator. The volumetric flow of the measurement fluid does not need to be compensated, and the meter's coefficient.

Wide range of applications, the flow of steam, gas and liquid can be measured;

The verification cycle is two years.

Limitations of Vortex Flowmeters :

Vortex flowmeter is a velocity type flowmeter. The stability of vortex separation is greatly affected by the velocity distribution, so it has certain requirements for straight pipe sections, generally the first 10D and the last 5D. When measuring liquid, the upper limit flow rate is affected by Limitation of pressure loss and cavitation is generally 10 m / s. When measuring gas, the upper limit flow rate is limited by the compressibility change of the medium, and the lower limit flow rate is limited by the Reynolds number and sensor sensitivity. The general gas flow rate range is 10-70 m / s, and the steam flow rate range is 8-50 m / s; Stress type vortex flowmeters are more sensitive to vibration. Therefore, when installing vortex flowmeters in pipelines with large vibrations, the pipeline must take certain measures to reduce vibration; stress type vortex flowmeters use piezoelectric crystals as detection sensors, so their Temperature limitation, generally long-term working temperature is -40 ℃ ~ + 350 ℃.