Roche Diagnostics May 2009
Service Manual · Version 9.0 A-27
cobas b 221 system 2 Fluid actions
Measurement
Washing the measuring chamber vicinity
This section is used to clean sample residues from the aspiration path, the bypass and
the sample distributor.
The T&D disk docks at position 2 (S1 Rinse solution); then a rinse solution-air mix is
aspirated into the waste separator over the aspiration path and the bypass or the
sample distributor (with V15 and V16 open) by creating a low pressure with the
vacuum pump. The correct rinse solution to air ratio is assessed with the SS2 sensor.
A Vacuum pump
B T&D module (position 2)
C Waste separator
D S1 Rinse solution
Figure A-14 Washing the measuring chamber vicinity
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