How long does it take to fill a 500 ml vessel with the SFT-10 SCF pump?

The SFT-10 SCF pump operates in a mode that once the CO₂ tank regulator is opened, CO₂ liquid will flow through the pump and equilibrate into the sample vessel to tank pressure (typically 750 psi given the vapor pressure of CO₂ is ~750 psi at room temperature). CO₂ is in reality a liquid-gas and compressible at lower pressures. What you will observe once you have started pumping CO₂ into your sample vessel is that from tank pressure up to about 1250 psi, the pressure increase is very slow because you are pumping liquid CO₂ that is rather compressible. Once you have crossed over the 1250 psi range, the density of the liquid CO₂ has now approached 1 gram/ml and the liquid CO₂ begins to pump very similar to any traditional HPLC type pumping unit.

Further complicating this answer is the fact that it is always assumed that the sample vessel has been filled with raw materials of varying densities and the dead volume within the sample vessel varies from experiment to experiment based on how well the raw materials were packed into the sample vessel. All of the above variables influence the actual “fill time” of your sample vessel in a traditional SFE experiment.