A product sampler including a substrate layer, a barrier layer covering the substrate layer, a gelatinoid product layer covering and in contact with the barrier layer, and a barrier layer covering and in contact with the product layer is provided. An element is mounted on the recessed end such that a portion of the element adjoining the blank is flush with the blank. The valve arrangement has a rest configuration in which the injection apparatus provides a non-activated fluid mixture F1\u2033 and an activated configuration in which the injection apparatus provides an activated fluid mixture F2. A message is then generated to locate the remote device over a communications network. More specifically it relates to the preparation of an enantiomerically pure or optically enriched enantiomer of either omeprazole, pantoprazole, lansoprazole, or rabeprazole from a mixture containing the same using means for simulated moving bed chromatography.