Vortex flowmeter flow rate

『Vortex flowmeter flow rate』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)

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.

2. Why is the cumulative flow rate displayed normally and the instantaneous flow rate displayed abnormally?

A vortex flowmeter is installed on site for measuring water flow, using a split installation method. The on-site equipment is running normally, but it was found that the instantaneous flow rate is displayed as zero, while the cumulative flow rate is accumulating normally. This situation is obviously not in line with convention, as under normal operating conditions, the cumulative instantaneous flow rate should be consistent with the cumulative flow rate value. After checking the menu of the flow integrator, it was found that the setting value of the instantaneous flow filtering function FLTR was 3, which caused abnormal display of instantaneous flow. After adjusting this value to 1, the instantaneous flow rate and cumulative flow rate display of the flowmeter returned to normal. After checking the manual, it was found that the flow integrator has a digital filtering function, which is used to overcome flow fluctuations and ensure the accuracy of accumulated flow. When the flow

『SILVER Official Website SERVICE』