Performance and application of Coriolis flow meters as transfer standards

For successful comparisons at the highest metrological level, the use of well-performing transfer standards is essential. In fluid flow measurement, Coriolis flow meters have proven to be suitable transfer standards due to their low uncertainty, as demonstrated in several national and international comparisons. This paper summarises the experiences and findings from completed comparisons, and experimental work, and provides practical recommendations for the use of Coriolis meters as transfer standards in future comparisons. Key areas of focus include zero setting, temperature dependencies, pressure effects, meter orientation, and the influence of disturbed inflow conditions as each of these can have a significant impact on meter performance. The paper also presents examples of how these factors are being considered in upcoming key comparisons. The aim is to share recent insights and support best practice in the application of Coriolis meters as transfer standards in high-accuracy flow metrology.