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What are the measurement ranges of vortex flowmeters?
1、 Vortex flowmeter is a flowmeter based on the Karman vortex principle for measurement. It can measure liquids and gases, and is also very economical. The diameter is generally DN10-- DN1000. With temperature and pressure compensation, it can accurately measure gas or steam flow, and has a wide range of applications;
2、 Vortex flowmeter can only measure volumetric flow rate, usually in m3/h (cubic meters per hour), with instantaneous flow display and cumulative flow display;
3、 The measurement range corresponding to electromagnetic flow meters of different diameters is: liquid measurement: (unit: m3/h): DN15
1.2-6; DN20
1.5---10； DN25：2---16； DN32
1.8---20； DN40：2.5---25； DN50：3.5---40； DN65：7.5---70； DN80：12---130； DN100：18---160； ..... Gas measurement: (unit: m3/h): DN15:4--28; DN20：6---40； DN25：8---50； DN32：15---150； DN40：18---180； DN50：25---480； DN65：50---500； DN80：80---800； DN100：120---1200； ..... For more detailed information, please refer to the technical article on the website of Shandong Qiangqiang Automation Technology Co., Ltd.... Www.qszdh.com
2. What are the parameters that determine the speed of a vortex flowmeter?
The speed of the measured slip amount (i.e. instrument display or output frequency) of a vortex flowmeter (usually referring to a vortex flowmeter) is mainly directly related to the following parameters:
1. Fluid physical parameters • Flow rate: The flow rate is proportional to the source flow rate, and the faster the flow rate, the higher the frequency of vortex generation.
. • Fan collapse density: affects the thrust generated by the vortex b
2. Instrument structural parameters • Shape and size of vortex street generators: The Strouhal number (St) of different shapes such as triangular and trapezoidal columns varies, directly affecting the conversion relationship between frequency and flow velocity. • Pipeline diameter: The larger the diameter, the lower the flow velocity at the same flow rate, and the corresponding output frequency decreases
3. Working environment parameters • Temperature: affects fluid density and viscosity, indirectly changing instrument coefficients (temperature compensation is required). • Pressure: High pressure may alter pipeline deformation and fluid density, requiring pressure compensation calibration
4. Signal processing parameters • Amplifier filtering settings: Improper cutoff frequency of high/low-pass filters can suppress effective signals. Sensitivity threshold: If the threshold is too high, it will miss low-frequency weak signals, while if it is too low, it is easy to introduce noise. Please note that the original output frequency of the vortex flowmeter is only related to the flow velocity and geometric characteristics of the generating body (f=St × v/d, where St is the Strouhal number, v is the flow velocity, and d is the characteristic width). Other parameters mainly affect the measurement results indirectly by affecting signal quality or instrument calibration. In actual use, parameter calibration and compensation should be carried out according to the manufacturers man
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