G0500503 Inter-laboratory comparison of water flow calibration facilities with high accuracy

Abstract

An inner-laboratory comparison for water flow calibration facilities with high accuracy, in other word, very low uncertainty is performed between Endress+Hauser Japan (EHJ) and Advanced Industrial Science and Technology, National Metrology Institute of Japan (AIST, NMJ.J). Flowrate range examined in this comparison is from 31 kg/h to 36000 kg/h. The expanded uncertainties at EHJ and at AIST, NMIJ are estimated to be 0.020% - 0.025% and 0.021% - 0.023%, respectively. The transfer meters are Coriolis flowmeters. The comparison results show nice agreement. The difference between two labs is within 0.02% and En value is less than 0.6. Especially, for flowrate more than 10000 kg/h, the difference is less than 0.01% and En value is less than 0.2.