Abstract
The article describes aspects of improving metrological support for measuring units of mass and volume of liquid in the flow, mass and volume flow of liquid in the Russian Federation. We consider fundamentally new design solutions for key modules of the reference unit EU-3 of the state primary special standard for units of mass and volume of liquid in the flow, mass and volume flow of liquid GET 63-2019, based on numerical and physical modeling of hydrodynamic processes under forced pressure flow of the working medium (water) in pipelines with different flow geometry. The principles of operation of water flow stabilization and control modules are substantiated. Innovative solutions are presented for the design of sensitive elements of the flow switch, the principle of constructing a time diagram, and determining the measurement time interval. Metrological characteristics of the state primary special standard of units of mass and volume of liquid in the flow, mass and volume flow of liquid GET 63-2019 are presented.
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