Roche cobas b 221 system User Manual

Roche Diagnostics May 2009
D-126 Service Manual · Version 9.0
7 Troubleshooting cobas b 221 system
Important test routines
Following items will be displayed in case of nOk – .
The temperature drift is shown as number of errors in the selected period. For each
module, the following limit (in percentage) applies:
FMS stability
Evaluates the difference between produced FMS mixture concentration and measured
mixture concentration.
Possible error causes: Defective main pump tubing, defective FMS tubing, defective
FMS module.
Following items will be displayed in case of nOk – .
The FMS stability is shown as number of errors in the selected period. For each
parameter, the following limit (in percentage) applies:
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.
Item Description
Meas. chamber
affected measuring chamber
Temperature
measurement
number of heating module messages
Deviation
number of heating module errors
Ta bl e D -2 1 Temperature drift details
Meas. chamber Limit value
all < 10 %
Ta bl e D -2 2 Standard deviation spec. 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.
Item Description
Meas. chamber
affected measuring chamber
Cycles
number of FMS cycles for the measuring chamber
Error
number of FMS errors
Ta bl e D -2 3 FMS stability details
Meas. chamber Limit value
all < 8 %
Ta bl e D -2 4 FMS stability evaluation

Roche cobas b 221 system Specifications

General

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