Abstract
Measurement accuracy in small oil flow range is becoming critical in industrial practices, especially evaluation of automobile fuel efficiency which is becoming very competitive among automobile manufacturers. Flow meters are used in engine test bench to evaluate the fuel consumption rate. Hence to ensure the accuracy of fuel efficiency derived from flow meters, traceability of flow rate measurement to national standard has to be established. Continuing efforts to upgrade the national standard for small oil flow at AIST in terms of calibration flow range is being carried out. Recently its calibration flow range was expanded to include volumetric flow range of 0.001 m^3/h 〜 0.1 m^3/h (1 L/h -100 L/h). The best calibration and measurement capability (CMC) is estimated to be 0.064 % for volumetric flow rate and 0.020 % for mass flow rate (coverage factor: k=2). Before the calibration service can be inaugurated, its calibration capability in the expanded flow range (1 L/h 〜 10 L/h) has to be verified. This was done through an in-house comparison with other national standard which was already established and verified. Comparison between small oil flow and small water flow facilities at AIST was carried out, using Coriolis fiowmeters as transfer standards. Calibration results by Coriolis flowmeters showed a good agreement between the two facilities.
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