Supercritical gas measurement and control
Fluids like carbon dioxide (CO2) and ethylene (C2H4)
are difficult to measure when they move towards the inter-phase stage between
being a liquid and a gas. For example, for CO2 this occurs at
temperatures >31.1°C and pressures higher than approx. 72.9 bara. Under
these conditions, physical properties like density (ρ) and heat capacity
(Cp) change very rapidly as a result of pressure or temperature variations.
This makes an accurate mass flow measurement, based on the thermal principle,
The true mass flow of the molecules is measured, regardless
of whether the fluid is in gas phase, in liquid phase or indeed somewhere
in between. Experiences in the field have proven that this principle of
measuring is very accurate and reliable. For control applications Bronkhorst
can offer a flow meter in combination with a metal sealed, pressure actuated
control valve. Please contact factory for a customised advice.