Coriolis flow meters are one of the most popular flow measurement technologies in the world today for high accuracy measurement of single-phase liquids, gases and even slurries. They are capable of measuring both mass and density directly and can also infer the volume flow. They can be installed in challenging process environments and have been successfully deployed with non-Newtonian fluids, high viscosity fluids, pulsating flows and even at extreme temperatures and pressures.

However, it is known that operating most Coriolis flow meters at a pressure which differs from the original calibration pressure requires compensation else significant measurement errors will occur. Pressure compensation coefficients appear to vary by manufacturer, meter geometry and sensor material. Furthermore, the manufacturer published pressure compensation coefficients are not fully traceable. To date, there has not been sufficient research exploring the consistency of the pressure compensation for identical Coriolis flow meters.

This paper presents the findings of a research conducted at the TÜV SÜD National Engineering Laboratory (NEL) Elevated Pressure and Temperature (EPAT) oil flow facility to investigate the pressure effect uniformity for matching Coriolis devices. The first stage of the experimental programme calibrated three identical DN80 Coriolis flow meters at a range of pressures with no pressure compensation applied. A pressure compensation coefficient was then derived from the data and the Coriolis meters were then calibrated at two alternative pressures to ascertain the robustness of the coefficients and whether the compensation could be extrapolated successfully.

From the experimental results, it can be concluded that the pressure effect for the three DN80 Coriolis flow meters was extremely repeatable and consistent with a discrepancy of less than 0.025% between the devices at 80 bar. Whilst the mass flow was significantly affected by fluid pressure, the fluid density did not appear to be influenced. The pressure corrected results were also well within the manufacturer specification of ±0.1%.

科里奥利流量计是当今世界上最流行的流量测量技术之一，用于高精度测量单相液体、气体甚至浆液。它们能够直接测量质量和密度，还可以推断体积流量。它们可以安装在具有挑战性的过程环境中，并已成功部署在非牛顿流体、高粘度流体、脉动流甚至极端温度和压力下。

然而，众所周知，在与原始校准压力不同的压力下操作大多数科里奥利流量计需要补偿，否则会出现显着的测量误差。压力补偿系数似乎因制造商、仪表几何形状和传感器材料而异。此外，制造商公布的压力补偿系数并不完全可追溯。迄今为止，还没有足够的研究探索相同科里奥利流量计的压力补偿的一致性。

本文介绍了在 TÜV 南德意志集团国家工程实验室 (NEL) 升高压力和温度 (EPAT) 油流设施中进行的一项研究结果，该研究旨在研究匹配科里奥利装置的压力效应均匀性。实验程序的第一阶段在没有应用压力补偿的压力范围内校准了三个相同的 DN80 科里奥利流量计。然后从数据中导出压力补偿系数，然后在两个替代压力下校准科里奥利仪表，以确定系数的稳健性以及补偿是否可以成功外推。

从实验结果可以得出结论，三个 DN80 科里奥利流量计的压力效应具有极强的可重复性，并且在 80 bar 下设备之间的差异小于 0.025%。虽然质量流量受到流体压力的显着影响，但流体密度似乎没有受到影响。压力校正结果也完全符合制造商规格的 ±0.1%。