Disclosed is a method for rendering vacuum conveyors inert, the vacuum conveyors including at least one intake device (30), a discharge device (40), a separating vessel (100), a vacuum pump device (20), and a system for feeding inert fluid into the separating vessel (100). An inert fluid is fed into the at least one separating vessel (100) below the free surface of a separated material (102) during inertization. A corresponding vacuum conveyor (10) which can be rendered inert includes a system for feeding inert fluid below the free surface (103) of a separated material on and/or in the at least one separating vessel (100).