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Title: Operation, Traceability And Measurement Uncertainty Of The Largest Water Flow Calibration Facility In Taiwan
Author: Chun-Lin Chiang, Yi-Lin Ho And Chun-Min Su
Source: 2012 International Symposium on Fluid Flow Measurement
Year Published: 2012
Abstract: The largest water flow calibration facility in Taiwan had re-established and accredited with ISO 17025 compliance by the Taiwan Accreditation Foundation (TAF) in October, 2011. This modified facility employs comparison method and volumetric (to deliver) method, together with flying start and finish mode, to calibrate water flowmeters with nominal sizes (DN) of 25 mm to 1500 mm. The comparison method covers calibrations in the flow rate range from 0.2 m3/h to 4200 m3/h, while the volumetric method enables calibrations from 125 m3/h to 8000 m3/h. A patented flow control technique is used to stabilize the flow during calibration, allowing the variation of flow rate to be within 1 %. The measurement uncertainty for comparison method was evaluated base on flow rate ranges of the standard meters. The maximum relative expanded uncertainty is 0.7 % and the minimum is 0.21 %. On the other hand, the measurement uncertainty for volumetric method depends on the liquid volume delivered, and the resulting expanded uncertainty has a maximum of 0.25 %. The metrological traceability from the primary standard of National Measurement Laboratory, Taiwan, to this facility was scientifically established through unbroken chain of documented calibrations of standard flowmeters. In this paper, we will show the traceability hierarchy of the system and how the flow measurement uncertainty is evaluated accordingly. Some system operation issues will also be addressed.

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