Abstract: An intermediate storage dosing unit for taking samples of a fluid. The intermediate storage dosing unit includes a container with an inlet and a two-way outlet. The two-way outlet has a riser as a first outlet and a drain as a second outlet. A system and a method for taking samples of a fluid. In particular, the system includes a sample acquisition unit and at least one sample vessel, the sample acquisition unit is configured to provide a fluid and the at least one sample vessel is configured to receive and store a fluid. A fluid transfer is also possible between the sample acquisition unit and the at least one sample vessel. The intermediate storage dosing unit of the type mentioned is connected between the sample acquisition unit and the at least one sample vessel.