Device for the separation of magnetic or paramagnetic microparticles and the elution of an analyte adsorbed on said particles, the device being a liquid system comprising - means for making fluidic connections, - a first and a second inlet (10, 20), - a rotary valve switching unit suitable for producing two different fluid connecting states, and - an extractor with an entry port and an exit port, and with a controllable device with an electromagnet which can be used to temporarily apply a local magnetic field, - magnetic or paramagnetic microparticles and liquid sample material, characterized in that the extractor comprises a fluid connecting line between the entry port and the exit port, and the controllable device is capable of temporarily applying a local magnetic field to two or more consecutive sections of the line, and wherein the device further comprises at least one pressure-generating means, an injection device, two storage containers (60, 70) for a first and a second mobile phase (65, 75) in a liquid state of aggregation, a collecting vessel, an outlet and, wherein - the first inlet is designed such that the first mobile phase can be fed under pressure from the first storage container to the LS via a fluidic connection; - the first inlet is additionally fluidically connected to the injection device, the injection device being designed such that it allows a mixture of said liquid sample material and said magnetic or paramagnetic microparticles suspended therein to be introduced into the first mobile phase that was introduced through the inlet; - the second inlet is designed such that the second mobile phase can be fed under pressure from the second storage container to the LS via a fluidic connection; - the first inlet is connected to a first entry port of the switching unit and the second inlet is fluidically connected to a second entry port of the switching unit; - the entry port of the extractor is fluidically connected to a first exit port of the switching unit and the exit port of the extractor is fluidically connected to a third entry port of the switching unit; - the second exit port of the switching unit is the outlet or is fluidically connected to the outlet; - the third exit port of the switching unit is fluidically connected to the collecting vessel; and - the switching unit is suitable in a first connecting state for fluidically connecting E1 and A1, E2 and A2 as well as E3 and A3 and in the second connecting state it is suitable for fluidically connecting E2 and A1, E3 and A2 as well as E1 and A3. - means for making fluidic connections, - a first and a second inlet (10, 20), - a rotary valve switching unit suitable for producing two different fluid connecting states, and - an extractor with an entry port and an exit port, and with a controllable device with an electromagnet which can be used to temporarily apply a local magnetic field, - magnetic or paramagnetic microparticles and liquid sample material, - the first inlet is designed such that the first mobile phase can be fed under pressure from the first storage container to the LS via a fluidic connection; - the first inlet is additionally fluidically connected to the injection device, the injection device being designed such that it allows a mixture of said liquid sample material and said magnetic or paramagnetic microparticles suspended therein to be introduced into the first mobile phase that was introduced through the inlet; - the second inlet is designed such that the second mobile phase can be fed under pressure from the second storage container to the LS via a fluidic connection; - the first inlet is connected to a first entry port of the switching unit and the second inlet is fluidically connected to a second entry port of the switching unit; - the entry port of the extractor is fluidically connected to a first exit port of the switching unit and the exit port of the extractor is fluidically connected to a third entry port of the switching unit; - the second exit port of the switching unit is the outlet or is fluidically connected to the outlet; - the third exit port of the switching unit is fluidically connected to the collecting vessel; and - the switching unit is suitable in a first connecting state for fluidically connecting E1 and A1, E2 and A2 as well as E3 and A3 and in the second connecting state it is suitable for fluidically connecting E2 and A1, E3 and A2 as well as E1 and A3.