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Modern trends in the design of modules of national standards for units of volume fluid flow rate (volume) in the range from 10–5–103 ml/min
https://doi.org/10.32446/0368-1025it.2021-7-32-41
Abstract
In the context of the needs of the leading sectors of the world economy, the current state of metrological support for measuring units of mass and volume of a liquid in a flow, mass and volume flow rates of a liquid in the range of micro-flow rates of 10–5–103 ml/min is considered. Based on the results of the analytical review, the main metrological and operating characteristics of national standards are presented. The basic principles of generating a fluid flow in national gravimetric and volumetric standards when measuring the mass and volume of a fluid by the dynamic weighing method have been determined. Constructive solutions and principles of operation of key modules of national standards are considered. Methods for filling a liquid into a storage tank and designs of storage tanks are determined, taking into account the minimization of the effect of liquid evaporation, the influence of capillary force and buoyancy. The main sources of uncertainty in measuring the mass and volume of a liquid by the dynamic weighing method and methods for minimizing these uncertainties are considered. A modified model of dynamic measurement of liquid mass flow rate is proposed, taking into account the main sources of uncertainty. A comparative assessment of the influence of sources of uncertainty on the metrological characteristics of national standards is presented.
About the Authors
R. R. Tukhvatullin
Всероссийский научно-исследовательский институт расходометрии – филиал ФГУП «Всероссийский научноисследовательский институт метрологии им. Д. И. Менделеева»
Russian Federation
Russian Federation
Rustam Rashidovich Tukhvatullin
Kazan, Republic of Tatarstan
A. V. Shchelchkov
VNIIR – Affiliated Branch of D. I. Mendeleyev Institute for Metrology;
Kazan National Research Technical University named after A. N. Tupolev – KAI
Russian Federation
Russian Federation
Alexey Valentinovich Shchelchkov
Kazan, Republic of Tatarstan
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For citations:
Tukhvatullin R.R., Shchelchkov A.V. Modern trends in the design of modules of national standards for units of volume fluid flow rate (volume) in the range from 10–5–103 ml/min. Izmeritel`naya Tekhnika. 2021;(7):32-41. (In Russ.) https://doi.org/10.32446/0368-1025it.2021-7-32-41
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