Roche cobas b 221 system

Roche Diagnostics May 2009
A-38 Service Manual · Version 9.0
2 Fluid actions cobas b 221 system
Calibration
O
2
-air calibration
This procedure determines the first calibration point of the O
2
electrode. Ambient air
is slowly aspirated from the T&D disk (position 4) into the BG measuring chamber
over the aspiration channel and sample distributor.
Then the electrodes are conditioned with Mix1.
e For more information, see Mix1/Mix2 calibration, aspirating BG/ISE reference solution on
page A-36.
A Main pump
B O
2
electrode
C T&D module (position 4)
Figure A-22 O
2
-air calibration
A B C