Roche cobas b 221 system User Manual

Roche Diagnostics May 2009
D-122 Service Manual · Version 9.0
7 Troubleshooting cobas b 221 system
Important test routines
Aspiration status
Evaluates the error probability of aspiration- and positioning procedures of
calibration solutions.
Possible error causes: leaky or blocked tubing paths, defective sample sensors or
defective contact paths.
Following items will be displayed in case of nOk – .
The aspiration status is shown as number of aspiration error entries. Each of the
following limits (in percentage) has to be fulfilled:
The D1, D2 and D3 cycles are evaluated same as MSS standby solution.
Electrode status
Evaluates the continuity (calibration values of different cycles), drift and stability of
the calibration values.
Possible error causes: wrong sample medium, old/defective/contaminated electrodes.
Following items will be displayed in case of nOk – .
Item Description
Media
medium that caused the aspiration error
Cycles
total number of aspirations of the media
Type of error
indication of the error;
h press [Details] for troubleshooting information
Error
number of errors with the media
Ta bl e D -7 Aspiration status details
Medium Limit value
Mix1 < 5 %
Mix2 < 20 %
O
2
zero < 30 %
Standby solution < 5 %
MSS CAL 1 < 5 %
MSS CAL 2 < 10 %
MSS CAL 3, CAL 4 < 30 %
Na Cond < 30 %
Clean < 30 %
Ta bl e D -8 Aspiration status evaluation
Stability monitor limits
The stability monitor uses smaller limits than the applied limits to the instrument in order to
recognize problems at an early stage.

Roche cobas b 221 system Specifications

General

Brand	Roche
Model	cobas b 221 system
Category	Medical Equipment
Language	English