A secondary stage sample separation device for separating at least a portion of a fluidic sample includes a fluidic interface configured for forming a fluidic coupling between a primary stage sample separation device and the secondary separation device, so that the fluidic sample separated by the primary stage sample separation device is fluidically suppliable to the secondary stage sample separation device via the fluidic interface for further separation, and a pressure reduction mechanism configured for reducing pressure at the fluidic interface at least in the event of an overpressure or of an excessive pressure increase.

A system reduces unwanted noise due to pump movement. The system includes a pump including a non-conductive piston extending into a pumping chamber for pumping the sample fluid along an analysis fluid path, a wash chamber, and a seal fluidly separating the pumping chamber from the wash chamber. The system also includes a wash path supplying a wash fluid from a wash reservoir to the wash chamber, an electrical conductor electrically connecting the analysis fluid path to the wash fluid path, and a ground conductor electrically connecting the electrical conductor to ground via a resistor. The electrical conductors and resistor combination between the chambers reduces unwanted noise in the conductivity detector due voltage potentials between the eluent and wash chambers created as the piston moves between the chambers.

An analytical device, in particular for analyzing a fluidic sample, includes a fluid drive configured to stream a first solvent and a second solvent along a flow path, so that the first solvent and the second solvent are streamed as a mixture at least during a time period. A determination device is configured to determine a value of a physical parameter with respect to the streaming of the mixture along the flow path, for at least two measurements each with a different mixing ratio of the first solvent and the second solvent, thereby determining at least two measurement results. An evaluation device is configured to compare the at least two determined measurement results with a reference, and to derive an information associated with the first solvent and/or the second solvent based on the comparison.