Roche Diagnostics
Operator’s Manual · Version 3.1 A-49
Cedex Bio System 3Hardware
Hardware overview
Transfer head arrest When the transfer head is obstructed in its horizontal movement, it immediately
stops. All pipetting and processing actions stop.
Mixing motor The mixing motor is mounted on the carriage. When running, it generates a circular
movement of the probe. This movement is used for mixing the content of cuvettes
and reagent bottles.
Probe The probe has a flat tip. This is required for tube bottom detection. Because such a
probe cannot pierce a bottle cap, all bottles must be placed on the instrument with
their caps removed.
Level detection A sensor detects when the probe enters a fluid. On the basis of this level, the system
establishes whether there is enough fluid to perform the scheduled pipetting action.
Tube Bottom detection A physical sensor is activated as soon as the probe touches the bottom of a sample
tube.
This mechanism also works when the probe touches an object outside the tube. In
both cases, probe action stops and an appropriate alarm message is generated.
A Mixing motor
B Transfer Z motor
C Probe holder
D Probe
E Mixer movement axis
Figure A-16 Transfer head
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