A filling device for metered filling of a filling material from a storage container into a dose receiving container. The device includes a single-use isolator with the receiving container provided therein to protect against contamination. The device includes a weighing device for holding and weighing the storage container, with its contents outside of the isolator. The device includes a dispensing device inside the isolator to provide a dose-by-dose dispensing of the material. The device includes a conduit arrangement for connecting the storage container and the dispending device and conveying the material from the storage container to the dispensing device via a removal device for a dose-by-dose removal of the material outside the isolator. The device includes a control device for controlling the removal device based on information from the weighing device about a decrease in weight of a unit consisting of the storage container and its contents during the removal.