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Title: Calibration Uncertainty Of Flowmeters For Hydrocarbon Flow By Using Subtraction Method
Author: Takashi Shimada, Ryouji Doihara And Yoshiya Terao
Source: 2012 International Symposium on Fluid Flow Measurement
Year Published: 2012
Abstract: The calibration uncertainty of flowmeters using the subtraction method for hydrocarbon flow has been experimentally and analytically evaluated in order to calibrate flowmeters at lower flow rates than the flow rate range calibrated using the calibration facility. An expanded uncertainty has been estimated to be less than 0.8 % at the flow rate ratio of 1/100 in the kerosene test rig of the primary standard facility at NMIJ. The main sources of combined uncertainty due to the subtraction method are the reproducibility of the working standard flowmeters and the temperature measurements. Furthermore, a flowmeter has been calibrated using the subtraction method in order to verify uncertainty analysis. The calibration results obtained by the subtraction method agree with those from weighing method within the quoted expanded uncertainty

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