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Apparatus for accurate density measurements of fluids over wide ranges of temperature, pressure, and density based on a compact single-sinker densimeter


H. Li1,2, M. Gong1, H. Guo1,2 and J. Wu1

1Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P.R. China
2Graduate University of Chinese Academy of Sciences, Beijing, China

Keywords: single-sinker densimeter
property: density
material: nitrogen; isobutane

A new apparatus used to obtain accurate (p-ρ-T) measurements of fluids over wide ranges of temperature, pressure, and density (90 to 290 K; 0 to 3 MPa; 5 to 1700 kg•m-3) is described in detail. This apparatus is designed based on a compact single-sinker densimeter and includes the refrigeration system, the thermostat system, the temperature and pressure measuring system. The total uncertainty in density is less than 0.1%+0.001 kg•m-3. It is primarily due to the calibration of the sinker. The uncertainty in temperature is 0.005 K and that in pressure is 300 Pa and 600 Pa for the 1.5MPa and 3MPa full scales respectively. This apparatus is specially designed for the density measurements of pure or mixed liquid refrigerants and standard fluids for the calibration of other type densimeters. The densities of high-purity nitrogen gas and isobutane liquid were measured to test and verify the reliability of the apparatus. The experimental results were campared with the literature data and the data calculated from the equation of state. Good agreements are obtained.


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