State Primary Standard of Unit of Specific Heat Capacity of Solids (Get 60-2019)
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STATE STANDARDS STATE PRIMARY STANDARD OF UNIT OF SPECIFIC HEAT CAPACITY OF SOLIDS (GET 60-2019) T. A. Kompan,1 V. I. Kulagin,1 V. V. Vlasova,1 S. V. Kondratiev,1 A. Ya. Lukin,2 and N. F. Pukhov1
UDC 536.628.2
The results of studies designed to improve the State Primary Standard of the unit of specific heat capacity (GET 60-74) carried out from 2017 to 2019 are described. A complex of high-precision measurement instruments that form the new State Primary Standard of the heat capacity of solids (GET 60-2019) at the head of which is the KA-S4 high-precision calorimeter was created. A set of standard measures of specific heat capacity was created to reproduce and transmit the unit from GET 60-2019 to lower-echelon measurement instruments. The measurement chain for transmission of the unit of specific heat capacity from GET 60-2019 to lower-echelon measurement instruments was developed. The expanded uncertainty of measurements performed on the basic KA-S4 adiabatic calorimeter of the standard complex in the working temperature range of GET 60-2019 does not exceed 0.27–0.36% with conformance factor k = 2. Keywords: standard, heat capacity, adiabatic calorimeter, measures of specific heat capacity, metrological characteristics.
Introduction. The need to improve the State Primary Standard of the unit of specific heat capacity (GET 60-–74) is due to the growing requirements imposed on the precision of the transmission of the unit of previously created measurement instruments, the need for metrological support of measurement instruments with specific designs and functionality, and new technologies and new problems of science [1–6]. The creation what is basically a new branch of industry over the past 30 years – thermophysical instrument design – was a response to the sharply growing interest around the world in the investigation of the thermophysical properties of materials. Commercial devices for thermal analysis have appeared in the arsenal of scientists, making it possible to measure a complex of properties, including the enthalpy and heat capacity of materials. Precision plants for the measurement of the specific heat capacity of solids that fulfill the function of national standards were created in many of the industrially developed countries (United States [7–10], Germany [11–13], Japan [14–17], and China [18]) to support the uniformity of this type of measurement. The adiabatic method of measurement with periodic input of thermal energy is used in practically all high-precision plants as the basic method of measurement. The method has been repeatedly verified in practical applications and is basically an unspoken standard for this type of measurement. GET 60-74 was created in Russia in 1974 [19]. It has since exhausted its operating life and become obsolescent. Studies designed to improve GET 60-74 based on new structural designs in light of technical capabilities that have changed were carried out from 2017 to 2019 at the Mendeleev All-Russia Research Institute of Metrology (VNIIM) to modernize the metrological a
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