Abstract: A method for carrying out an integrity test on a filter element includes filling a fluid into at least one vessel (1), in which a filter element (F) to be tested is arranged. The method proceeds by setting the pressure of the fluid in the vessel (1) to a predetermined test pressure, and maintaining the test pressure in the vessel (1) with controlled replenishment of fluid into the vessel (1) and/or a controlled change in internal volume of the vessel (1). The method continues by determining an integrity characteristic variable for the filter element (F) in a manner dependent on the controlled replenishment of fluid into the vessel (1) and/or dependent on the controlled change in internal volume of the vessel (1) before attaining a substantially continuous volume flow of fluid for maintaining the specific test pressure in the vessel (1).

Abstract: A method for carrying out an integrity test on a filter element includes filling a fluid into at least one vessel (1), in which a filter element (F) to be tested is arranged. The method proceeds by setting the pressure of the fluid in the vessel (1) to a predetermined test pressure, and maintaining the test pressure in the vessel (1) with controlled replenishment of fluid into the vessel (1) and/or a controlled change in internal volume of the vessel (1). The method continues by determining an integrity characteristic variable for the filter element (F) in a manner dependent on the controlled replenishment of fluid into the vessel (1) and/or dependent on the controlled change in internal volume of the vessel (1) before attaining a substantially continuous volume flow of fluid for maintaining the specific test pressure in the vessel (1).

Abstract: The invention relates to a crossflow-filtration method for beverages, in particular beer, which comprises the following steps: a) the feed liquid is introduced into a filter module by means of a tangential flow through a filter membrane (6) in a first direction, whereby the filtrate flow on the filtrate side (19) of the filter module is maintained within predetermined threshold values; b) the entry pressure is reduced and the filter is backflushed by surges of filtrate initiated by a reversal of the flow direction transversally to the membrane; c) the feed liquid is optionally introduced in an inverse flow direction to that of step a) and the concentrate is evacuated on the non-filtrate (7) side of the module; d) the entry pressure is reduced and the filter is backflushed by surges of filtrate initiated by a reversal of the flow direction transversally to the membrane; e) steps a) to d) are repeated until the filtrate flow lies below the lower predetermined threshold value; f) to k) the filter is emptied by a