Flowmeter reading correction

Formulas

without viscosity: Q = Q₀ · √(ρ_cal / ρ_act)

with viscosity: Q = Q₀ · √(ρ_cal · η_act / (ρ_act · η_cal))

Calculation rules

• Q₀ – flowmeter reading, ρ – density [kg/m³], η – dynamic viscosity [µPa·s]; “cal” – the gas the flowmeter is scaled for, “act” – the actual gas.
• Gas density and viscosity as listed in the calculator table: density at 0 °C and 1013 hPa, viscosity at about 20 °C; for mixtures, density is the composition-weighted mean and viscosity follows Wilke’s rule.
• The viscosity variant is an approximation. Results are indicative; for exact settings use the flowmeter manufacturer’s tables.
• Rounding: Flow – 2 decimal places, factor – 4 decimal places, difference in % – 1 decimal place.