Disclosed is a method for separating a plurality of different chemicals in a sample. The technique involves activating a set of port power controllers. In another preferred embodiment, in response to a loss of fluid pressure in the first chamber, the second piston is displaceable to enable displacement of the locking means to open the pack. The operating section further includes a curved lower lid contacting area and at least one notch for contacting a rim on a container and providing a pivot point. The condenser evaporator system can be provided as multiple condenser evaporator systems operating from a source of compressed gaseous refrigerant. Due to such a constitution, the generation of an uncomfortable sound derived from a magnetic distortion of cores of the magnetic current modulator incorporated in a deflection unit can be prevented.