Improved State primary pressure unit standard for the absolute pressure range from 1·10–2 to 1·107 Pa GET 101-2011

Brief historical information about the creation and development of the Russian Federation standard base in the field of pressure is provided. The results of the analysis of the state and development trends of world metrology in the field of absolute pressure measurements, based on the study of literary data and the results of key comparisons, are briefly presented. The article presents the reasons that led to the development of laser interferometric liquid manometers at the D. I. Mendeleyev Institute for Metrology and their inclusion in the State primary pressure unit standard for the absolute pressure range GET 101-2011. The existing problems of the Russian Federation absolute pressure standard base are analyzed. The purposes are defined and the research results aimed at the accuracy increasing and the expansion of the absolute pressure unit reproduction range are presented. This determines the choice of the GET 101-2011 standard modernization methods: development of a high-resolution laser interferometric oil manometer and of an absolute pressure piston gauge with a set of measuring piston systems. The composition of the modernized GЭT 101-2011 is presented, the design and operating principles of standard installations based on laser interferometric liquid and absolute pressure piston gauges are briefly described, as well as the operating principle of the means for transmitting the pressure unit to secondary and working standards from GET 101-2011 is presented. Results of the research on the improved GЭT 101- 2011 are provided, along with its main metrological characteristics confirmed through state testing. The range of absolute pressure unit reproduction has been expanded to both low and high absolute pressures, spanning from 1·10–2 to 1·107 Pa, the accuracy of unit reproduction is increased by 3–1,5 times in the range from 1·10–1 to 102 Pa, the process of transferring pressure units to secondary and working standards has been improved.