Evaluation of Uncertainty of Measurement Result of Meter Coefficient of Precession Vortex Flow Meter

Abstract: The information on the uncertainty evaluation of the measurement results of the meter coefficient of the precession vortex flowmeter is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Abstract: It is necessary to establish a mathematical model for the meter coefficient of the precession vortex flow and juice, and on this basis, the relative uncertainty of the input quantity is evaluated. 1 Overview 1.1 Purpose: to evaluate the uncertainty of the measurement results of the instrument coefficient of the precession vortex flowmeter. 1.2 Measurement according to. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the uncertainty evaluation of the measurement results of the meter coefficient of the precession vortex flowmeter. Mathematical model should be established for precession vortex flow and juice meter coefficient, and the relative uncertainty of input quantity should be evaluated on this basis. 1 Overview 1.1 Purpose: To evaluate the uncertainty of the measurement results of the instrument coefficient of the precession vortex flowmeter. 1.2 Measurement basis: JJG198—94 'Velocity Flowmeter' Metrology Verification Regulations. 1.3 Measurement standard: Sonic nozzle method gas flow standard device, accuracy grade: 0.5, measurement range: (5～1200) m3/h, and the verification medium is air. 1.4 The measured object and its main performance: precession vortex gas flowmeter: +100; flow range (28-400) m3/h; basic error not greater than±1.0%. 1.5 Measurement process: under the specified environmental conditions, according to JJG198—94 'Velocity Flowmeter' verification regulations, with air as the medium, measured by the standard meter method. The ratio of the pulse amount output by the measured flowmeter measured at the i-th point and the standard volume flow rate obtained by the standard gas flow device at this point this time is taken as the meter coefficient of the i-th measurement at the i-th point. 1.6 Application of evaluation results: The measurement results that meet the above conditions can generally use the results of this uncertainty evaluation directly. For the uncertainty evaluation of the measurement results of other flowmeters and instrument coefficients, you can refer to this evaluation method. 2 Mathematical Model 3 Sources of Uncertainty The sources of uncertainty of the instrument coefficient measurement mainly include: the standard uncertainty u4 introduced by the measurement repeatability and the standard uncertainty uB introduced by the measurement standard. 4 Evaluation of the standard uncertainty component 4. Evaluation of the standard uncertainty UA (Nij) introduced by the repeatability of the 1% immersion amount Under the condition of repeatability, for a precession vortex flowmeter, the flow rate is selected at the maximum flow rate A set of measurement columns obtained by repeating the measurement 10 times independently with the sonic nozzle method for 6o seconds at 50% of J. The uncertainty of the flow indication value of the standard device measured at the time of the second verification mainly comes from the measurement error of the gas flow standard device, and its uncertainty is evaluated by the B-type method. Its specification gives the expanded uncertainty of the gas flow standard device U=0.5%, k=2, so: ubrel (Vij)=O.5/2=0.25% 4.3 The measurement data of the precession vortex flowmeter instrument coefficient ( Table 2) 5. Evaluation of synthetic standard uncertainty 6. Measurement results and uncertainty reports . 'Evaluation of Uncertainty of Measurement Results of Instrument Coefficients of Precession Vortex Flow Meters'

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