Patent ID: 8899101

Claim:
A sampler, for use in testing the dissolution behavior of pharmaceutical products, wherein the sampler comprises: a vial holder for accommodating a plurality of vials: a sampling needle assembly with a plurality of sampling needles, wherein the sampling needle assembly and the vial holder may be moved relative to one another in such a way that the sampling needles of the sampling needle assembly may be inserted into the vials of the vial holder; and a pump unit with a plurality of diaphragm pumps which are designed to convey a fluid via the sampling needle assembly to the vials in the vial holder and to withdraw a fluid therefrom; wherein the diaphragm pumps have one controllable valve each at their fluid inlet and their fluid outlet so that bidirectional fluid transport can take place; wherein the controllable valves are designed such that the diaphragm pumps can be operated in accordance with the FIFO principle.