Abstract: A tube from a plurality of tubes from a tube rack configured to removably hold the plurality of tubes are removed from a tube rack. A weight of the tube which has been removed from the tube rack is determined. A balancing parameter of the tube is determined by a computing device. An estimated balancing parameter of each of a plurality of remaining tubes from the plurality of tubes in the tube rack is determined. A corresponding rotor position from a plurality of rotor positions within the rotor for the tube is determined by the computing device based at least on the balancing parameter of the tube, the balancing parameters of previously placed tubes from the plurality of tubes placed within the rotor and the estimated balancing parameter of each of the plurality of remaining tubes. The transport unit places the tube in the corresponding rotor position within the rotor.

Abstract: The present invention is an apparatus for extracting organic compounds from solid materials. A generator vessel has a removable closure for receiving a solid or liquid solvent which is heated with a resistive heating element to a gaseous or supercritical phase. The removable closure is unencumbered because the side wall is penetrated with an outlet for the gaseous or supercritical solvent. The generator vessel further has a pressure transducer that provides an electronic signal related to pressure of the gaseous or supercritical solvent. The apparatus of the present invention further includes at least one extraction cell having a top and a bottom and a wall extending therebetween, wherein the bottom is sealably penetrated by an inlet for gaseous or supercritical solvent received through a manifold connected to the outlet, the top having an easy-open removable closure cap, and the wall having an outlet port.