What is the unit of r on a vortex flowmeter

『The unit of vortex flowmeter』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 flow coefficient of a vortex flowmeter? The commonly used self regulating vortex flowmeter instrument coefficient: It has been debugged and tested before leaving the factory, and the instrument constant K of each flowmeter has been indicated on the nameplate and factory certificate. Its physical meaning is the number of pulses output by the flowmeter for every 1 liter volume flow rate flowing through the flowmeter in the calibration state (P=101.3kPa, t=20 ℃), with a unit of 1/L. Due to changes in the temperature of the measuring medium, the geometric dimensions of the measuring pipeline and vortex generating body change due to thermal expansion and contraction, and the flow instrument constant needs to be corrected. The expression of the correction coefficient KT is: KT=1-4.8 × 10-5 × t-20, where t - the temperature of the measuring medium., ℃. 1: Calculate the actual volumetric flow rate of the pipeline under working conditions based on the flow range set by the process: the flow rate set by the process can be the mass flow rate (kg/h), the volumetric flow rate under working conditions (m3/h), or the volumetric flow rate under standard conditions (N m3/h). The method for converting the mass flow rate or the volumetric flow rate under standard conditions to the volumetric flow rate under working conditions is as follows: a. Convert the large flow rate (upper range limit) Gmax (kg/h) of the mass flow rate to the volumetric flow rate Qmax (m3/h) under working conditions, using the formula Qmax Gmax × - m3/h). In the formula: ρ - the density of the medium under instrument working conditions kg/m3b. Convert the large flow rate (upper range limit) Q0max of the gas standard state to the volumetric flow rate under working conditions. (Nm3/h) converted to the volumetric flow rate Qmax (m3/h) under working conditions, the calculation formula is: Qmax Q0max × ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- In the formula (m3/h): P - gauge pressure of gas under instrument operating conditions (MPa) megahertz; T - Temperature of gas under instrument operating conditions (℃). 2: Calculate the high frequency fmax of the vortex street based on the large volume flow rate Qmax (m3/h) under working conditions (fmax - × Qmax × K × KT Hz). In the formula: K - instrument coefficient (1/L), the value of K is indicated on the instrument nameplate; KT - Temperature correction coefficient. For example, given that the instrument coefficient of a 10 inch vortex flowmeter is 1.2 pulses per liter, the above equation can be used to calculate the instrument coefficient of a 20 inch vortex flowmeter as 0.15 pulses per liter, while the coefficient of a DN80 flowmeter is 2.344 pulses per liter. In this way, vortex flowmeters of any diameter can be designed and processed according to actual working conditions, and their theoretical instrument coefficients can be calculated, providing theoretical reference for calibrating instrument coefficients in real flow.

2. Flow meter reading method

The flow meter reading method varies depending on the type of base height, with a focus on identifying the display area and mastering the numerical calculation logic.

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