19. International Flow Measurement Conference (FLOMEKO), Virtual Conference and Chongqing, 1-4, November, 2022, China
Freie Schlagworte
inter comparison ; flow meter ; meter characteristion ; transfer standard uncertainty
Zusammenfassung
The most common criterion for assessing a participating laboratory’s results is whether the normalized error |Eni| is ≤ 1. Comparison reports we reviewed properly include uncertainty components related to the transfer standard (υTS) and the repeatability of the calibrations (υrepeati) in the uncertainty of the value reported by a participant. Unfortunately, high values for either υTS and υrepeati decrease |Eni|, making it easier to achieve passing results in a comparison that uses a poor transfer standard or for a participant that delivers unstable measurements.
Improved comparison criteria were proposed to counteract the flaws of the |Eni| ≤ 1 criterion by introducing the possibility of inconclusive results and a probability-based approach. In this paper, we define comparison uncertainty υcomp as the root-sum-of-squares of υTS and υrepeati and find it a better tool for assessing the power of the comparison than υTS alone. We applied the comparison evaluation criteria to recent comparison results to illustrate their benefits over the |Eni| ≤ 1 criterion. In general, the newer criteria confirm prior determinations, but in some cases passing results for the |Eni| ≤ 1 criterion would be found inconclusive.
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Themenbereich der Metrologie
Durchfluss
Zitierung
Frahm, E. & Wright, J. (2022). Evaluating Inter-laboratory Comparison Data. 19. International Flow Measurement Conference (FLOMEKO), Virtual Conference and Chongqing, 1-4, November, 2022, China.
