METHOD TO DETERMINE MOISTURE CONTENT IN GASES AND DEVICE FOR ITS REALISATION Russian patent published in 2014 - IPC G01N25/56 

FIELD: measurement equipment.

SUBSTANCE: invention relates to the field of measurement of gas moisture content. The method consists in the fact that gas is exposed to compression in a closed measurement chamber, in which an equal-arm yoke is installed, equipped with a measuring float and a counterweight, until pressure, at which gas density becomes equal to density of the measurement float, which is determined by float surfacing and horizontal position of the yoke, the values of temperature and pressure are recorded in the closed measurement chamber at the moment of float surfacing, and using the measured values, they determine the value of moisture content of the investigated gas according to the following ratios: d(g/kg dry air)=[m_steam (g)]÷[m_dry×10^-3 (kg)]=(A×E)÷{[m_float÷(P_lab+ΔP_exc)]-(A×E)×10^-3} (l), where A=(ρ_steam×10³)÷(ρ_dry-ρ_steam)=1638.8 - constant (2) ρ_steam - water steam density, ρ_steam=0.803 g/litre ρ_dry - dry air density, ρ_dry=1.293 g/litre E={[ρ_dry×V_float×T₀]÷[P₀×(T₀+t_lab)]-m_float÷(P_lab+ΔP_exc)} (3), where V_float - volume of the float (in litres), m_float - weight of the float with account of counterweight (in g), T₀=273°C, t_lab - temperature of the investigated air, °C, P₀ - normal atmospheric pressure, P₀=760 mm of mercury column, P_lab - pressure in the laboratory, mm of mercury column, ΔP_exc - value of excessive pressure ΔP_exc=(P_chamber-P_lab), mm of mercury column. P_chamber - pressure in the measurement chamber at the moment of float surfacing, mm of mercury column.

EFFECT: reduced operating costs and higher safety of measurements.