LB 9507 Chapter 2: Design of the Lumat
2-7
Tube transport rotor The tube transport rotor is made of a special conductive plastic
which prevents electrostatic charges from building up.
The rotor contains two holes positioned opposite each other, and
each can hold a sample tube, meaning that one hole is always in
loading position (at the front, facing the user) and one in
measurement position. Pressing a button (<START> when
measuring, or the softkey <TURN ONCE>) causes the rotor to
turn through 180°, thus switching the positions of the tubes. The
tube in the loading position is lifted by a spring-pin so that it is
easier to take out (see Figs. 2-5 and 2-6). This rotation principle
allows samples to be loaded and measured at the same time.
Sealing lips (spring-loaded)
Fig. 2-6: Tube transport rotor
To distinguish between the two measurement chambers, one
of them is marked with a red spot. This measurement
chamber is called the "red" chamber, the other is called the
"black" chamber.
The top of the tube transport rotor includes two spring-loaded
sealing lips which shield the measurement chamber from light.
Tube in
measurement
position
Tube in
loading position
(pushed up)
Measurement chamber:
the rear surface
is mirrored to
increase the
light again
Spring pin:
the tube sits on
the spring pin; in the
loading position it is -
pushed up by a
sloping base
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