Supercritical gas measurement and control
Fluids like carbon dioxide (CO2) are difficult to measure
when they move towards the inter-phase stage between being a liquid and
a gas. For example, the supercritical point of CO2 is reached
at 73,8 bara and 31,1 °C. Beyond 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, very difficult.
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.