Roche Diagnostics May 2009
Service Manual · Version 9.0 C-7
cobas b 221 system 6 Maintenance
Decontamination
Automatic BG cleaning If the automatic BG cleaning is activated, internal instrument data such as the
measuring frequency and drift behavior of the sensors is used to automatically select
an optimum cleaning interval.
e
For details, see Reference Manual chapter 3 Setup, section Times & intervals > Maintenance
schedule.
External cleaning An additional external cleaning with deproteinizer should only be carried out if the
measuring chamber is contaminated (protein deposits) or if components of the
sample path must be exchanged.
Activate the following function, starting with the top level of the analyzer mode:
h System > Wash & cleaning > Cleaning modules
a Cleaning the BG- / ISE-/ COOX- or tHb/SO
2
module
1
Activate the corresponding module and press h [Start external cleaning].
2
The external cleaning agent is inserted like a sample (syringe or capillary) via the
fill port.
Measuring module Samples Cycle
BG 500 never
ISE 200 never
COOX und tHb/SO
2
20 never
MSS --- never
Ta bl e C -1 Standard settings for automatic internal cleaning
Figure C-1 Cleaning modules
Tip:
ISE module: the frequency of the cleaning process depends on the lab-specific type of sample
(physiological, pathological, fetal blood).
BG module: should be cleaned only on demand, in the following scenario:
o
visible blood clot in the BG module
o
low PO
2
QC recoveries due to microscopic bacterial contamination of the PO
2
electrode
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