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| Study of Glass Hydrometer Calibration by Hydrostatic Weighting |
| CHEN Chao-yun1,2,WANG Jin-tao2,LI Zhi-hao2,SUN Bin1 |
1. China Jiliang University, Hangzhou, Zhejiang 310018, China
2. National Institute of Metrology, Beijing 100029, China |
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Abstract Glass hydrometers calibration uses silicon ring as a reference standard solid density, tri-tretradecane with density stability and low surface tension as the standard working liquid, CCD image measurement system to align the scale of hydrometer and liquid surface, designes a glass hydrometer calibration system. According to twice glass hydrometer weighing in the air and liquid can calculate the correction value of the current scale. To measure the density range of 770~790 kg/m3, a resolution of 0.2 kg/m3 of hydrometer is used. The results of measurement comparing with that of the Physikalisch-Technische Bundesanstalt,verify the validity of the calibration system.
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Received: 13 April 2015
Published: 28 February 2017
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2017, Vol. 38 
