Chapter 2: Design of the Lumat LB 9507
2-8
In case of need the rotor can also be turned manually (see below),
so that it can be placed in positions other than the exact
measurement positions.
The software-controlled rotation movement positions the rotor
exactly; this is vital for measurement as all of the sample must be
located in front of the photomultiplier, and the measurement
chamber must remain sealed against light. This position has been
reached if:
❑ the tube is slightly raised in the loading position
❑ the kidney-shaped holes in the measurement chamber cover
and the rotor are exactly aligned (see Fig. 2-7).
The spring-loaded sealing lips (see Fig. 2-6) of the tube transport
rotor will only click into the groove in the lower side of the
measurement unit cover when this position has been reached,
thus preventing any light from entering the rear measurement
chamber.
Fig. 2-7: Exact positioning of tube transport rotor
Position a
In position a, turn the rotor
anticlockwise until position b
has been reached
Position b
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