In the standard gas permeability configuration, the flow through a dry filter is measured at a predefined pressure. The gas flow in liter/min is recalculated to a gas permeability value taken into account the diameter of the sample to amount of gas per surface units. The result is expressed in l/m². For solvent filtrations where liquids are pushed trough a filters, it is important to know the liquid permeability as a function of the type liquid.

Such test can be performed using the  gas permeability mode of the POROLUX with the liquid permeability option. A solvent tank is placed in between the pressure control and the sample. When the tank is pressurized to a certain pressure, the solvent that will flow through the sample can be related to the amount of gas flowing to the solvent tank. If required, the amount of filtered liquid can be collected on a balance placed underneath the sample holder. Thus the filtered volume can also be monitored as a function of time.