Abstract Coriolis metering technology is widely applied throughout industry. In addition to the mass flow rate, a Coriolis meter can measure fluid density based on the resonant frequency of the flow tube vibration. There is currently increasing interest in utilising this density measurement capability as the primary process value in applications such as precision control for fluid property conditioning, and fluid contamination monitoring. However, within these applications, ambient temperature variation can be significant. This paper details research data obtained using NEL's ‘Very Low Flow’ single-phase facility. The rig was modified to include a programmable temperature enclosure in which a Coriolis meter was installed. Two commercial meter models from the same manufacturer were tested. Both meters showed fluid density errors when subjected to fluctuations in the surrounding ambient air temperature. The fluid properties of the test medium were confirmed to be stable using NEL's UKAS standard reference instrumentation. Previous temperature effects research for Coriolis meters have focussed on the process fluid temperature and there is little published data on the effects of ambient temperature.

中文翻译：

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由环境空气和流体温差引起的科里奥利仪表密度误差

摘要 科里奥利计量技术在工业中得到广泛应用。除了质量流量外，科里奥利流量计还可以根据流量管振动的共振频率测量流体密度。目前，人们越来越有兴趣利用这种密度测量功能作为应用中的主要过程值，例如流体特性调节的精确控制和流体污染监测。然而，在这些应用中，环境温度变化可能很大。本文详细介绍了使用 NEL 的“极低流量”单相设备获得的研究数据。该钻机经过修改，包括一个可编程温度外壳，其中安装了科里奥利仪表。测试了来自同一制造商的两种商用仪表型号。当受到周围环境空气温度的波动时，两种仪表都显示流体密度误差。使用 NEL 的 UKAS 标准参考仪器确认测试介质的流体特性是稳定的。以前对科里奥利仪表的温度影响研究主要集中在过程流体温度上，几乎没有关于环境温度影响的已发表数据。