Metrological Dependability Indicators Analysis of the Glass Capillary Reference Viscometers

Abstract

The paper presents results of studying metrological reliability indicators of the glass capillary reference viscometers. They are included in the EC KVx reference systems designed for measuring, storing and transmitting the kinematic viscosity unit of liquids corresponding to the working standards level of the 1st category according to the state verification scheme for instruments measuring the liquids viscosity. It was approved by the Order of the Federal Agency for Technical Regulation and Metrology dated November 5, 2019 no. 2622. The paper shows that metrological reliability of the viscosity measuring instruments is characterized by such indicators as probability of the failure-free operation and time between failures, and it is ensured by the high stability of the conversion coefficient for viscometers with the capillaries of various diameters. Clarification of the "metrological reliability" term is proposed, providing the required degree of unambiguity in its definition and interpretation. High stability over time and accuracy of determining the conversion coefficient are the viscometer main characteristics. They make it possible to maintain the required accuracy level in transmitting the kinematic viscosity size and justify compliance of the competence level of the laboratory operating in the reference systems with requirements of the GOST ISO/IEC 17025--2019. It creates conditions ensuring successful participation of the laboratory in international and key comparisons in measuring the liquid media viscosity

Please cite this article in English as:

Neklyudova A.A., Sulaberidze V.Sh. Metrological dependability indicators analysis of the glass capillary reference viscometers. Herald of the Bauman Moscow State Technical University, Series Instrument Engineering, 2024, no. 1 (146), pp. 38--56 (in Russ.). EDN: EPSEET

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