Roche cobas b 221 system User Manual

Roche Diagnostics May 2009
Service Manual · Version 9.0 D-125
cobas b 221 system 7 Troubleshooting
Important test routines
Electrode slope
Evaluates the sensitivity of the electrode/sensor to the sample medium.
Possible error causes: old, defective or contaminated electrodes.
With at least one error message, this test will result in nor ok – with the following
items displayed.
The electrode slope is shown as number of errors in the selected period. For each
parameter, the following limit (in percentage) applies:
Conductivity drift
Evaluates the drift of the conductivity in the BG or ISE measuring chamber as ratio
from the conductivity at sample positioning to the conductivity when the
measurement result is available.
Possible error causes: wetting problems, defective measuring chamber electronics,
contamination in the measuring chamber.
Following items will be displayed in case of nOk – .
Theconductivity drift is shown as number of errors in the selected period. For each
measuring chamber, the following limit (in percentage) applies:
Temperature drift
Evaluates the stability of the temperature in the measuring chambers and in the SD-
cartridge.
Possible error causes: defective heatings, power supply problems, defective fans.
Item Description
Parameters
affected parameters
Each parameter may be listed more than once due to different
electrode status messages.
2P cal
number of parameter messages
Sensitivity low
number of parameter errors
Ta bl e D -17 Electrode slope details
Sensor Limit value
all 0 % (no errors)
Ta bl e D -18 Electrode slope evaluation
Item Description
Meas. chamber
affected measuring chamber
Conductivity meas.
number of measuring chamber messages
Drift too big
number of measuring chamber errors
Ta bl e D -19 Conductivity drift details
Meas. chamber Limit value
all < 10 %
Ta bl e D -2 0 Standard deviation spec. evaluation

Roche cobas b 221 system Specifications

General

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