Vortex flowmeter amplifier

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1. What parameters are related to the speed of a vortex flowmeter?

The measurement slip and roundness speed (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: Flow rate is proportional to the speed of the source and flow, and the faster the flow rate, the higher the frequency of vortex generation.

. • Fan collapse density: affects the thrust generated by the vortex body, indirectly affects the signal strength, but does not directly change the frequency. • Viscosity: High viscosity fluids can weaken the stability of vortex streets, leading to measurement errors or signal loss in the low-frequency range

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 i

f 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 manual.

2. What is the working principle of vortex flowmeter? The working principle of vortex flowmeter is based on the theory of vortex generation and its correlation with fluid flow rate proposed by Kaman and Strouhsl. When fluid flows through a triangular cylinder at a specific velocity, alternating vortex bands are generated behind its two sides, known as "Karman vortex streets". Due to the alternating generation of vortices on both sides, pulsating pressure will be generated on both sides of the cylinder, causing the detection object to feel the alternating pressure. The piezoelectric crystal element encapsulated inside the probe body generates alternating electrical signals with the same frequency as the vortex under the action of alternating pressure. The amplifier amplifies, filters, and shapes these electrical signals, and finally outputs a differential signal with a frequency proportional to the fluid flow rate (or converts it into a 4-20mA signal), which is sent to the integrator for processing, display, and control. The maintenance of vortex flowmeter is very important. The probe of the vortex flowmeter should be cleaned regularly to avoid inaccurate measurement caused

1. What parameters are related to the speed of a vortex flowmeter?

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