LB 9507 Chapter 2: Design of the Lumat
2-9
Tube detector At the front of the instrument is a light barrier for detecting tubes.
This prevents an unloaded sample holder from moving into the
measurement position. In this case injection would contaminate
the inside of the measurement chamber. The test is performed
every time the <start> button is pressed during the measurement
procedure or when activating the washing function.
Stepping motor The tube transport rotor is driven by a stepping motor which can
be stopped by applying a slight amount of pressure. This prevents
finger injury and stops the tubes from getting damaged. If you
want to clean the upper surface of the tube transport rotor, you
can turn it manually to any position. To return the rotor to the
correct position, press the softkey <TURN ONCE>. This will turn
the rotor to the next position or the position after next, depending
on the current position. You can reset the position manually if you
like.
Injector head The injector head (only on instruments with injectors) is fixed to
the measurement chamber cover by 2 silver-coloured cross-head
bolts. It incorporates a ring-shaped raised section with a sealing
ring which sits on the opening on the side of the measurement
chamber cover (Fig. 2-8).
Do not open the small cover on the injector head.
Fig. 2-8: Placing the injector head on the sample holder
Injector head
Ring-shaped raised
section with sealing ring
Measurement
chamber
Tube detector
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