Abstract: Apparatus for carrying out chromatography, preferably liquid process chromatography, in particular for industrial applications, using in each case at least one positive displacement pump, provided with a drive, for feeding product and eluent (mobile phase) onto at least one separation column, wherein the drive of each positive displacement pump is a highly dynamic drive, which is equipped with an integrated transducer system for capturing the distance/time date, which are convertible into corresponding position-regulated travel commands using connected superordinate movement control/regulation.

Abstract: At least two fluids separated from one another are mixed by means of pump force via respective suction lines and conveyed into a conveying line by a pump delivery stroke. The fluids are mixed in the pump head of a single oscillating positive displacement pump, the drive of which is controlled in accordance with a proportion of the fluids to be mixed, the suction stroke of the drive is divided over its rotary angle into individual sections during which the fluids are sucked into the pump head one after another, whereupon the fluids which have already been mixed in the pump head are ejected into the conveying line during the subsequent pump delivery stroke. The suction lines of at least two fluids to be mixed are provided with valves and connected to the pump head, the drive controller of which is configured for switching over the valves.

Abstract: A method for homogenizing conveying flow from at least two oscillating positive displacement pumps utilizing a drive motor for each pump and a rotating shaft, the fluid conveying flow in a conveying line is generated by the oscillating positive displacement pumps, the drive motors controlled such that the conveying flow generated overall in the conveying line is largely uniform or constant. An apparatus according to the invention is distinguished by at least two oscillating positive displacement pumps, the delivery lines of which are connected to a common conveying line in order to superimpose the individual conveying flows and each have a drive motor which can be operated in electronic synchronization without mechanical coupling in order to achieve a largely uniform or constant total conveying flow.