To satisfy the requirement of the online vibrating liquid density meter compulsory verification, an online vibrating density standard device should be established. Through ana-lysing the sources of measurement uncertainty for the density standard device, the evaluation of the measurement uncertainty is carried out for each input component, such as repeatabili-ty, a first-class standard density meter, frequency meter resolution and the temperature measurement. The expanded uncertainty of density standard device is 0.32 kg/m3, and the verification/calibration work for the liquid density meter with the accuracy of 0.5 degree could be carried out.%为满足在线振动管液体密度计的强制检定要求,需建立在线振动管密度标准装置.通过对密度标准装置的测量不确定度来源分析,分别对重复性、一等标准密度计、频率计分辨率、温度测量等各输入分量进行测量不确定度的评定.评定密度标准装置的扩展不确定度为0.32 kg/m3,符合国家计量检定系统表的要求,可以开展准确度等级为0.5级的液体密度计的检定/校准工作.
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