Abstract
Inter-laboratory comparisons for water flow calibration facilities between Advanced Industrial Science and Technology (AIST) and JCSS accredited companies are carried out for wide range flowrate from 0.005 m3/h to 5000 m3/h using many types of flowmeters. The purpose of this paper is to establish a reliability of the water flow calibration facilities in the JCSS accredited companies. The deviations of test results by each lab from AIST are almost less than ±0.1% and average one is ±0.025%. En values for all test results are less than 1 and geometric mean of En value is from 0.11 to 0.17. These results are equivalent level with the international key comparison operated by CCM/WGFF and indicate the high reliability of the calibration facilities in each lab. Moreover, the validity of the comparison method using multi-type flowmeters is also indicated.
