Roche Diagnostics
B-38 Operator’s Manual · Version 3.1
5 Daily operation Cedex Bio System
Analyzing samples
Defining orders
Preconditions o All preparation tasks are complete.
o The required tests are installed on the system and ready for use (calibration and
QC performed).
o The system status is either Standby or Operating.
o At least one sample position on the sample area is free.
o There can be only one order per test and sample.
o Possible post-dilution is predefined in the application definition.
Incorrect results due to declining sample quality
Evaporation of sample fluid may lead to incorrect results. In ambient temperatures of more
than 25°C, be sure to start processing immediately after placing the sample and defining
the order. When processing of the order is finished, be sure to immediately remove the
sample from the sample area.
Incorrect results due to insufficient fluid
Insufficient fluid may lead to inaccurate pipetting and consequently to incorrect results.
Always fill the tubes with enough fluid that at least the defined dead volume of fluid is left
when pipetting is complete.
e
See Tubes on page A-53.
Incorrect results due to inappropriate tube and cup placement
Inappropriate tube and cup placement may lead to inaccurate pipetting and consequently
to incorrect results.
Make sure that the primary tubes are placed centrally and perfectly vertically in the holders
in the sample area and that they are inserted firmly.
Make sure that secondary tubes are placed centrally on the primary tubes and that they
rest fully on them.
Probe damage and instrument malfunction due to not removing primary tube caps
The probe is not designed to pierce tube caps. It can get damaged when trying to pierce
tube caps, which can lead to instrument malfunction.
Always remove the caps of primary tubes before placing them on the instrument.
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