RING METHOD FOR HYDROMETER CALIBRATION

摘要

Ring method offers simple yet effective hydrometer calibration method with comparable performance to other hydrometer calibration methods. This work reports a ring method experimental setup for calibrating hydrometers. It uses a suitable dimension of ring to sink hydrometers in standard liquid which traceable to solid density determined by hydrostatic weighing method. The surface tension of the standard liquid density was measured by tensiometer consists of balance and Wilhelmy plate. The calibration results shown that, the range has been expanded from 0.600 g/ml up to 1.000 g/ml with uncertainty of 0.0002 g/ml. The theoretical calculation was developed and tested with experimental data. The ring method experimental setup and procedure were found to be much simpler and cheaper with a better accuracy. Furthermore, it does not use any harmful chemicals.