Rack for analyzer and analyzer comprising such a rack

A rack for holding containers containing liquids, said rack comprising:

• (a) a frame having sections, each section being adapted for receiving a liquid containing component;
• (b) a first section of said frame being adapted for receiving a first liquid containing component adapted for being removably but tightly mechanically connected to said first section;
• (c) a second section of said frame comprising a recessed housing chamber with a defined length flanked by opposing side walls, wherein a movable part sits in said recessed housing chamber, said movable part having a length that is shorter than the length of the recessed housing chamber, wherein said side walls define permitted limits of movement for said movable part sitting in said recessed housing chamber, said movable part containing means for coupling to a shaker device, said movable part further containing one or more means for receiving and holding a second liquid containing component, said movable part being loosely connected to said second section of the frame by means of pins cooperating with openings in said second section of the frame and corresponding openings in said movable part;
• and
• wherein said movable part transmits motion to said second liquid containing component within the second section, while no motion is transmitted to said first liquid containing component within the first section.