Modern trends in the design of modules of national standards for units of volume fluid flow rate (volume) in the range from 10–5 to 103 ml/min

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.

[1]  Elsa Batista,et al.  Development of an experimental setup for microflow measurement using interferometry , 2020, Flow Measurement and Instrumentation.

[2]  H. Bissig,et al.  Water collection techniques at very low flow rates including strong capillary effects , 2020 .

[3]  T. Chinarak,et al.  The Development of Small Water Flow Facility at National Institute of Metrology, Thailand , 2018, Journal of Physics: Conference Series.

[4]  M. Dobre,et al.  Special Section on the 18th International Congress of Metrology (CIM 2017) , 2018 .

[5]  John D. Wright,et al.  Microparticle tracking velocimetry as a tool for microfluidic flow measurements , 2017 .

[6]  T. Shimada,et al.  Liquid low-flow calibration rig using syringe pump and weighing tank system , 2016 .

[7]  Rui Martins,et al.  Primary standards for measuring flow rates from 100 nl/min to 1 ml/min – gravimetric principle , 2015, Biomedizinische Technik. Biomedical engineering.

[8]  Peter Lucas,et al.  Primary standard for liquid flow rates between 30 and 1500 nl/min based on volume expansion , 2015, Biomedizinische Technik. Biomedical engineering.

[9]  Tom H. Platenkamp,et al.  Low Flow Liquid Calibration Setup , 2015, Micromachines.

[10]  Remco J. Wiegerink,et al.  Integrated Thermal and Microcoriolis Flow Sensing System with a Dynamic Flow Range of More Than Five Decades , 2011, Micromachines.

[11]  Christopher David,et al.  Novel water flow facility in france range extension to low flow rates (10 000 ml/h down to 1 ml/h) , 2011 .

[12]  A. Shchelchkov,et al.  State primary special standard of units of mass and volume of liquid in a stream, mass and volumetric flow rates of liquid GET 63-2019 , 2021 .

[13]  P. Prajitno,et al.  Development of volumetric micro-flow calibration system using FPGA for medical application , 2015 .