Vortex flowmeter model| Hengshui flowmeter professional manufacturer

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1. How to adjust the measurement accuracy of vortex flowmeter

The core method for adjusting the measurement accuracy of vortex flowmeter is to achieve precise control of ± 0.5%~± 1% through fluid condition optimization, equipment parameter calibration, and installation and maintenance. 1. Fluid condition control • Flow rate range: Keep the flow rate within the calibration range of 3-30m/s (DN50 caliber as an example), and install a rectifier if it exceeds the range • Medium purity: Solid particle content ≤ 0.1g/m ³, and install a Y-shaped filter if necessary • Temperature compensation: When the medium temperature changes by more than ± 10 ℃, use the built-in PT100 temperature sensor for compensation • Equipment parameter calibration • K coefficient calibration: Use a standard table comparison method to calibrate on the flow calibration table. The latest JJG1030-2023 regulation requires no less than 5 calibration points • Pressure compensation setting: When the working pressure deviates from the calibration pressure by ± 10%, the current absolute pressure value (unit kPa) needs to be re input • Signal processing: It is recommended to use 4-20mA for the output frequency signal of the piezoelectric lift sensor.+Pulse dual output mode 3. Installation and maintenance points • Straight pipe section requirements: upstream ≥ 15D, downstream ≥ 5D (D) For the diameter of the pipe, the new national standard GB/T38622-2024 in 2024 has added a compensation formula for the installation of bent pipes. Vibration control: the vibration acceleration at the installation position should be less than 0.2g, otherwise a shock absorber bracket needs to be installed. Regular inspection: check every 6 months for sharp edge wear caused

by noisy slag, and if the wear amount is greater than 0.3mm, special working conditions need to be replaced. It is recommended to install a buffer tank for the pulsating flow field, so that the pulsating frequency is less than 1/10 and the vortex shedding frequency. Multiphase flow measurement needs to use a multi parameter compensation algorithm. The latest Emerson ROSEMENT 8800D model supports automatic correction of gas-liquid two-phase flow. Uncertainty of the swirl flowmeter should be classified according to its classification. Analysis of Class A/B includes core influencing factors such as measurement repeatability and standard device error. 1. Uncertainty analysis methods for two types of vortex flowmeters: Type A flowmeter: using the instrument K coefficient to calculate the indication error, uncertainty analysis focuses on the stability of the K coefficient and the repeatability of the flow point measurement. ② B-class flowmeter: cumulative flow is used to calculate indication error, and uncertainty needs to be introduced as variables, including measurement error and pulse counting stability.

2. The main influencing factors of uncertainty need to be considered for all types of vortex flowmeters: • Flow meter repeatability: the degree of dispersion of continuous measurement data • Standard device error: such as the accuracy level of gas flow accompanying the standard device • Medium state fluctuation: density deviation caused by temperature and pressure changes. 3 In practical applications, it is recommended to prioritize using the real flow calibration method to obtain the correction parameters for specific models when the measurement accuracy requirement is higher than level 1.0. If theoretical estimation

Vortex flowmeter model

1. How to adjust the measurement accuracy of vortex flowmeter

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