The history of creation and modernization of the state primary standards of units of dynamic, kinematic viscosity of liquid and density

Abstract

The current state of the metrological infrastructure of the Russian Federation in the field of density and viscosity measurements is analyzed. The State primary standard of units of dynamic and kinematic viscosity of liquid GET 17-2018 and primary standard of unit of density GET 18-2014 and the ways of their development since their creation are described. The composition, the principle of operation and the main metrological characteristics of the standards under consideration are given. The necessity of updating the state verification schemes for measuring the density and viscosity of liquids is shown. Further stages of improvement of the state primary standards of units of dynamic, kinematic viscosity of liquid and density are considered. Promising areas of improvement of GET 17-2018 – automation of measuring processes – development of an automatic reference system for the expiration time of the test liquid through the capillary of the viscometer, as well as the expansion of the upper limits of the ranges of values of dynamic and kinematic viscosity and the range of pressure values up to 100 MPa. The main task of improving the GET 18-2014 is to create a basis for the development of metrological support methods for measuring the density of gases, including natural gas at an overpressure of no more than 30 MPa and a temperature range of 0... 100 ° C. The results of key comparisons of standards confirming the calibration and measuring capabilities of the Russian Federation in the field of viscosity and density measurements are presented.