FIELD: measuring equipment engineering.
SUBSTANCE: method includes using breath valve of reservoir, for which a value of aerodynamic resistance ζ for breath valve is set, excessive pressure or vacuum ΔP in gas space of reservoir and height h of raising of valve plate, while volumetric flow rate Q of steam-air mixture is determined from following dependence: 
where D - diameter of mounting socket of valve plate, p - average density of steam-air mixture.
EFFECT: higher precision, higher reliability.
2 cl
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