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1. What is the difference between a vortex flowmeter and an electromagnetic flowmeter?
The difference between a vortex flowmeter and an electromagnetic flowmeter is as follows:
1. Measurement principle. Vortex flowmeter: It uses the phenomenon of vortex generated by the flow of the vortex vane with the fluid, and calculates the flow rate of the fluid by measuring the rotation frequency or speed of the vortex vane.
. Electromagnetic flowmeter: Using the principle of electromagnetic induction, it measures the electromotive force experienced by a conductive fluid flowing in a magnetic field, thereby measuring the flow rate of the fluid. From the perspective of the original pronunciation, the difference between the two is obvious.2. Structural form: Vortex flowmeter: composed of vortex generator, piezoelectric element, guide element and magnetic circuit part.
. The transmitter housing is made of steel plate or aluminum alloy plate by integral die-casting, and the body and sensor are combined into an integrated unit instrument. Electromagnetic flowmeter: composed of a conductive tube, excitation coil, housing, and electrodes, with secondary meters installed at the upper and lower ends of the electrodes.III. Vortex flowmeter: it is mainly used to measure the flow of liquid, steam and gas, but it is not applicable to viscous liquid, granular solid medium and liquid containing foam and bubbles. Electromagnetic flowmeter: suitable for measuring the flow rate of various conductive liquids, but cannot measure non-conductive media.
Fourth, output signal vortex flowmeter: usually outputs a standard current signal of 4-20mA.
. Electromagnetic flowmeter: outputting a linear signal propor
2. Working principle of vortex flowmeter | Manufacturer interpretation
Vortex flowmeter is a flow measurement instrument designed based on the Karman vortex principle, mainly used for flow detection of gases, liquids, and steam in industrial pipelines.
. The core principle and working process are as follows:1. Core principle: Karman vortex street effect. When the fluid flows through a non streamlined vortex generator (such as a triangular column), two regular vortices will alternately separate on both sides of the generator, forming Karman vortex streets. The release frequency (f) of the vortex is related to the fluid flow velocity (v) and the characteristic width of the generating body (d) as follows: f=Sr × (v/d), where Sr (Strouhal number) is a dimensionless constant that remains stable within a specific Reynolds number range (usually 2 × 10 ^ -7 × 10 ^ -2), ensuring a linear relationship between frequency and flow velocity. Figure 1: Schematic diagram of alternating vortices generated by fluid around a triangular column
Analysis of working process: When the fluid flows through the triangular column, vortices are alternately formed on both sides of the generating body due to pressure difference, and the strength of the vortices is proportional to the flow velocity.
. Frequency dete
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