What is the accuracy level standard for micro threaded vortex flowmeters

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What is the formula for calculating the frequency and flow rate of a vortex flowmeter? In general, the flow equation of a turbine flowmeter can be divided into two types: practical flow equation and theoretical flow equation. Practical flow equation: qv=f/K formula 1; In the equation qm=qv ρ, qv and qm respectively represent volumetric flow rates, m3/s， Quality flow, kg/s; F is the frequency of the output signal of the flowmeter, Hz; K is the instrument coefficient of the flowmeter, P/m3。 According to the Instrumentation World Network, the coefficient of a turbine flowmeter can be divided into two segments, namely the linear segment and the nonlinear segment. The linear segment is about two-thirds of its working segment, and its characteristics are related to the sensor structure size and fluid viscosity. In the nonlinear segment, the characteristics are greatly affected by bearing friction and fluid viscous resistance. When the flow rate is below the lower limit of the sensor flow rate, the instrument coefficient changes rapidly with the flow rate. The pressure loss is approximately proportional to the square of the flow rate. When the traffic exceeds the upper limit, attention should be paid to preventing cavitation. The shape of TUF characteristic curves with similar structures is similar, with only differences in the level of systematic error. The characteristic curve of the turbine flowmeter is calibrated by a flow verification device, which completely disregards the internal fluid mechanism of the sensor. The sensor is treated as a black box, and its conversion coefficient is determined based on the input (flow rate) and output (frequency pulse signal), making it convenient for practical applications. However, it should be noted that the conversion coefficient (instrument coefficient) of this shirt is conditional, and its verification condition is a reference condition. If it deviates from this condition during use, the bridge coefficient will change depending on the sensor type, pipeline installation conditions, and fluid properties parameters. The theoretical flow equation of a turbine flowmeter can derive the motion equation of the impeller based on the moment of momentum. Flow rate V=3600F/K, where F is the frequency of the vortex flowmeter and K is the factory sensitivity and dust calibration coefficient of the vortex flowmeter. The working principle of the vortex flowmeter is based on the Karman vortex phenomenon for flow measurement. The following is a detailed explanation of its working principle: The vortex flowmeter is mainly composed of a vortex generator, a detection probe, and corresponding electronic circuits. When a fluid flows through a vortex generator (such as a cylinder), two alternating rows of vortices are formed on both sides, which are called Karman vortex streets. The formation of Karman vortex street is an important phenomenon in fluid dynamics, which manifests as a series of ordered and alternately arranged vortices on both sides of an obstacle when the fluid passes over it. The frequency of vortex separation is directly proportional to the flow velocity of the sluggish fluid and inversely proportional to the width of the vortex generator. This relationship can be represented by a specific formula, where the vortex separation frequency f, dimensionless constant St (Strouhal number), average fluid velocity V in the pipeline, upstream face width d of the cylinder, and inner diameter D of the sensor hous

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