State primary standard of relative humidity of gases, molar (volume) fraction of moisture, dew / frost point temperature, hydrocarbon condensation temperature units GET 151-2020

The State primary standard of relative humidity, molar (volume) fraction of water, dew point/frost temperature units GET 151-2014 improvement was carried out in order to expand the numbers and ranges of reproducible values and improve its functionality. As a result of the improvement, a set of reference generators was developed and introduced into the State primary standard, reproducing the dew/frost point temperature and the hydrocarbon condensation temperature at high pressures of the working gas. The description of the National primary standard of relative humidity, molar (volume) fraction of water, dew/frost point temperature, hydrocarbon condensation temperature units GET 151-2020 and its complex of reference generators, which implement the reproduction of units of dew/frost temperature and hydrocarbons condensation temperature units, is presented, taking into account the info fencing factors according to working gas pressure. The metrological characteristics of GET 151-2020 have been studied. A budget of the measurement uncertainty has been compiled when reproducing the dew/frost point temperature and the hydrocarbon dew point temperature. The State verify action scheme for measuring gas humidity and hydrocarbon condensation temperature was developed and approved. Topical issues of ensuring the uniformity of measurements in the fi led of hygrometry have been resolved. The tasks of metrological support of means for measuring the dew point temperature and the condensation temperature of hydrocarbon gases at high pressures of the working gas have been implemented. The results obtained will be useful in creating an experimental base for studying the physical properties of technical and natural gases and approving state reference data in a wide range of pressures and temperatures of the working gas.

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