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Title: Expansion Of Calibration Flow Ra Nge Of Small Liquid Hydrocarbon Flow Facility At Nmij
Author: Kar-Hooi Cheong Ryouji Doihara Takashi Shimada Yoshiya Terao
Source: 2015 International Symposium on Fluid Flow Measurement
Year Published: 2015
Abstract: Lower limit of calibration flow range of small liquid hydrocarbon flow facility at NMIJ has been expanded from 1 L/h to 0.02 L/h corresponding to about 0.016 kg/h for mass flow rate. The upper limit remains unchanged at 100 L/h. Working liquids include kerosene and light oil. Calibration and measurement capacity (CMC) is estimated to be 0.078 % for volumetric flow range (0.02 L/h 1 L/h) and 0.050 % for mass flow range (0.016 kg/h 0.8 kg/h) (coverage factor: k 2). To cover the expanded flow range, a new gravimetric weighing system employing a smaller weighing scale (maximum liquid collection of 100 g) was installe d in addition to the current weighing system (maximum liquid collection of 2 kg). Uncertainty analysis shows that liquid mass measurement and dead volume effect become more significant in terms of contribution to the overall uncertainty compared with estimation of liquid density which is still the largest uncertainty source. Comparison was also carried out between the smaller (100 g) and the larger (2 kg) weighing systems over their overlapping flow range using a volumetric flow meter as a transfer standard.

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