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Proceedings Paper

Study of glass hydrometer calibration by hydrostatic weighting
Author(s): Chaoyun Chen; Jintao Wang; Zhihao Li; Peiman Zhang
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Paper Abstract

Glass hydrometers are simple but effective instruments for measuring the density of liquids. Glass hydrometers calibration based on the Archimedes law, using silicon ring as a reference standard solid density, n-tridecane with density stability and low surface tension as the standard working liquid, based on hydrostatic weighing method designs a glass hydrometer calibration system. Glass hydrometer calibration system uses CCD image measurement system to align the scale of hydrometer and liquid surface, with positioning accuracy of 0.01 mm. Surface tension of the working liquid is measured by Whihemy plate. According to twice glass hydrometer weighing in the air and liquid can calculate the correction value of the current scale. In order to verify the validity of the principle of the hydrostatic weighing method of glass hydrometer calibration system, for measuring the density range of (770-790) kg/m3, with a resolution of 0.2 kg/m3 of hydrometer. The results of measurement compare with the Physikalisch-Technische Bundesanstalt(PTB) ,verifying the validity of the calibration system.

Paper Details

Date Published: 26 January 2016
PDF: 5 pages
Proc. SPIE 9903, Seventh International Symposium on Precision Mechanical Measurements, 99030N (26 January 2016); doi: 10.1117/12.2211284
Show Author Affiliations
Chaoyun Chen, China Jiliang Univ. (China)
Jintao Wang, National Institute of Metrology (China)
Zhihao Li, National Institute of Metrology (China)
Peiman Zhang, Qingdao Institute of Measurement Technology (China)

Published in SPIE Proceedings Vol. 9903:
Seventh International Symposium on Precision Mechanical Measurements
Liandong Yu, Editor(s)

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