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Title: A Modified En Numbers For Verifying The Long Term Stability Of The Reference Flow Meters
Author: Yong Moon Choi Woong Kang Hae Man Choi Byung Ro Yoon
Source: 2015 International Symposium on Fluid Flow Measurement
Year Published: 2015
Abstract: A reference flow meter is used in NMI (national measurement institute) or calibration laboratories in many countries. Even if the primary standard system has more accurate measurement capability, the reference flow meter has many advantages. The main criteria to select a reference flow meter are accuracy and stability. In this study, calibration data of 37 reference flow meters of 11 calibration laboratories were analyzed because those have been calibrated by the same primary standard system of the KRISS (Korea Research Institute of Standards and Science). The long term stability of the reference flow meter is estimated by the variation of deviation from the flow rate value of the primary standard system for several years. Also uncertainty is modified at each flow rate point including the annual variance of deviation. Finally, a modified En number is propose d to check the performance of reference flow meters. The long term stability suggested in this study can be used to make a decision of working flow range, calibration period, repair or replacement of the reference flow meter

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