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What are the reasons for inaccurate measurement of vortex flowmeters?
The principle of inaccurate measurement of vortex street flowmeter may have the following factors
1. The selection of vortex street flowmeter is generally based on one diameter and one flow range. Therefore, when choosing a vortex street flowmeter, accurate and reliable parameters must be provided in order to select a suitable diameter vortex street flowmeter.
. If the diameter of the vortex street and the pipeline cannot match the stove god, it is recommended to use a variable diameter method to solve the problem.2、 In the case of flow fluctuations, the flowmeter may experience large fluctuations during measurement. Firstly, when installing the vortex flowmeter, it is necessary to ensure that the installation method is correct in order to ensure the stability of flow measurement.
3、 The influence of accumulation on the upstream surface of the vortex generator in a vortex flowmeter. If there are viscous particles in the measured fluid, they may gradually accumulate on the upstream surface of the vortex generator, causing changes in its geometric shape and scale, and therefore the flow coefficient will also change accordingly. Therefore, attention should be paid to this in application.
2. What are the types of mass flow meters
3. What are the parameters that determine the speed of a vortex flow meter?
The measured slip amount speed (i.e. instrument display or output frequency) of a vortex flow meter (usually referring to a vortex flow meter) is mainly directly related to the following parameters.
1. Fluid physical parameters • Flow rate: Flow rate is proportional to the source flow rate, a
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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 affec