State primary standard of unit of mass fraction and unit of mass concentration of moisture in solid substances and solid fabricated materials

The results of the development of a gas mixing and analytical stand (reference complex) for testing in order to approve the type of automatic measuring systems (AMS) for determining the content of pollutants in industrial emissions are presented. During the use of the AMS test bench, the units of molar fraction and mass concentration are transferred from the State primary standard of units of molar fraction, mass fraction and mass concentration of components in gas and gas condensate media GET 154 to the tested measuring gas channels of AMS, thereby ensuring traceability of AMS measurement results to the State primary standard GET 154.

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A reference installation based on thermo-gravimetric analysis with mass-spectrometric detection as a part of the state primary standard GET 173

Industrial laboratory Diagnostics of materials ◽

10.26896/1028-6861-2018-84-6-63-68 ◽

2018 ◽

Vol 84 (6) ◽

pp. 63-70 ◽

Cited By ~ 4

Author(s):

M. Yu. Medvedevskikh ◽

M. P. Krasheninina ◽

A. S. Sergeeva ◽

O. S. Shokhina

Keyword(s):

Mass Fraction ◽

Water Mass ◽

Primary Standard ◽

Thermo Gravimetric Analysis ◽

The State ◽

State Primary Standard ◽

Gravimetric Analysis ◽

Thermo Gravimetric ◽

Reference Installation

The issue of assuring the traceability of the results of water determination in solid and liquid substances and materials is discussed. The stages of development and improvement, as well as composition of the State primary measurement standard of mass fraction and mass (molar) concentration of water in liquid and solid substances and materials (GET 173) are considered. The problems of the limited applicability of GET 173 in case of separation of water with different binding energies and impossibility of conducting qualitative analysis of non-water volatile compounds during heating of substances and materials are revealed. The results regarding upgrading of GET 173 due to incorporation of additional reference installation which implements the methods of thermo-gravimetric analysis (TGA), differential scanning calorimetry (DSC) and mass-spectrometry (MS) are presented. The composition and operating principle of the new reference unit are described. An algorithm for estimating the uncertainty of reproducing a unit mass fraction of water using this reference facility is presented and sources of the uncertainty are identified. The results of the experiment on determination of the lower limit of the reproduction range for a unit water mass fraction are presented. We also present the results of comparisons regarding determination of the water mass fraction in crystalline hydrates obtained using the improved State primary standard and high-precision installations of the metrological and leading sectorial research institutes of the European countries. The results of developing a certified reference material of water mass fraction in sodium molybdate dihydrate (Na2MoO4· 2H2O CRM UNIIM 10911–2017 intended for metrological support of measurement instruments and measurement procedures based on thermo-gravimetric method are presented. Additional possibilities which result from the introduction of a new reference installation into the state primary standard of GET 173 are disclosed: identification and the quantification of non-water volatile components, adjustment of drying regimes both in laboratory and process conditions, determination of water content as one of the main impurities in estimating mass fraction of the main component of high-purity substances.

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Research on expanding the range of reproduction of magnetic flux density of the DC field of the state primary standard GET12-2011

Izmeritel`naya Tekhnika ◽

10.32446/0368-1025it.2020-4-3-7 ◽

2020 ◽

pp. 3-7

Author(s):

Vladlen Ya. Shifrin ◽

Denis I. Belyakov ◽

Alexander E. Shilov ◽

Denis D. Kosenko

Keyword(s):

Magnetic Flux ◽

Magnetic Induction ◽

Frequency Conversion ◽

Magnetic Measurements ◽

Primary Standard ◽

Uncertainty Budget ◽

The State ◽

State Primary Standard ◽

Magnetic Flux Density ◽

Constant Field

The results of works aimed at increasing the level of uniformity of measurements of the magnetic induction of a constant field – the basic value in the field of magnetic measurements. A set of equipment for reproducing a unit of magnetic induction of a constant field in the range of 1–25 mT was created and described. The inclusion of this complex in the State primary standard of units of magnetic induction, magnetic flux, magnetic moment and magnetic induction gradient GET 12-2011 will ensure the reproduction and direct transmission of the unit of permanent magnetic induction in the ranges of not only weak (10–3–1 mT), but medium (1–25 mT) and strong (0.025–1 T) magnetic fields. A quantum cesium magnetometer based on the resolved structure of cesium atoms was created to transmit the unit of magnetic induction to the region of medium fields. The procedure for calculating the frequency conversion coefficients to magnetic induction of the created quantum cesium magnetometer is described. The uncertainty budget for reproducing a unit of magnetic induction of a constant field using the created complex is estimated.

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