CALIBRATION OF HYDROMETER BY HYDROSTATIC WEIGHING SYSTEM AT DENSITY LABORATORY, NML-SIRIM

摘要

This paper presents the calibration of hydrometer within the range of 600 kg/m~(3) to 2000kg/m~(3) at respectivesurface tension by using hydrostatic weighing system, which is currently practised in Density Laboratory of National Metrology Laboratory (NML), SIRIM Berhad. This system weighed the hydrometers while they were partially immersed in the distilled water. A sinker was added to the hydrometers, which ranges were below than the density of the distilled water. Surface tension of the distilled water was measured by Wilhelmy plate and the constant value of the distilled water density was obtained from the British Standard (BS718: 1991 - table 11).