本文基于AntonPaar公司的高压振动管密度计模块（DMA—HPM）研制了一套用于高压流体的液相密度测量系统，可使用的温度范围为293-373K，最大压力为70MPa。取包含因子为2时，温度、压力和密度测量的扩展不确定度分别优于4-16mK，土0．13MPa和4-0．6kg／m^3。使用水和真空作为标准状态对系统常数进行了标定，并用丙烷进行了检验，实验结果与文献方程的偏差均在测量不确定度以内，表明了本实验系统的可靠性和准确性。
A density measurement system was developed using a vibrating tube densimeter （Anton Paar DMA-HPM） for high pressure density measurements. Currently, this unit is applicable for temperatures from 293 K to 373 K and pressures up to 70 MPa. The estimated expanded uncertainty （k=2） for temperature, pressure and density are ±16 mK, 4.0.13 MPa and ±0.6 kg/m3, respectively. The densimeter was calibrated by using water and vacuum. The compressed liquid densities of propane were measured in this work to prove the capability of the system.
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