FIELD: methods for preparing steam-gas mixtures of substances in mass concentration units, possible use for metrological provision (attestation, verification and graduation) of gas analyzers.
SUBSTANCE: in the method for preparation of steam-gas mixture for calibrating gas-analyzers in mass units of concentration of the component being analyzed, comprising injection of given amount of the component being analyzed into preliminarily vacuumized hermetic vessel, mixing thereof with diluting gas and forcing resulting mixture towards the gas analyzer being calibrated, a bottle of known capacity is connected to hermetic vessel with possible isolation from it, which bottle is preliminarily vacuumized and its mass is measured, value of pressure is computed, which ensures achievement of given mass concentration of the component being analyzed at a temperature which equals environment temperature in accordance to the formula: 
where Pn - pressure, ensuring achievement of given mass concentration of the component being analyzed, kPa; 
- given mass concentration of the component being analyzed, g/m; T - environment temperature, °K; M - molecular mass of the component being analyzed; K - coefficient, which includes the universal gas constant and a numeric value which leads to required dimension of pressure (K=8,3·10-3m3·kPa/°K·grammolecule), resulting combined volume of vessel and bottle is vacuumized, component being analyzed is injected into it until achievement of computed pressure at temperature which equals temperature of environment, after that the bottle is isolated and disconnected from hermetic vessel, bottle mass is measured and effective value of mass concentration CM is derived from formula 
where CM - mass concentration of the substance being analyzed, g/m3; Mk - mass of bottle with the substance being analyzed, g; M0 - mass of vacuumized bottle, g; V - bottle capacity, m3.
EFFECT: increased precision of preparation of steam-gas mixture in mass units of substance concentration during calibration of gas analyzers, expanded range of concentrations of mixture components.
1 dwg
