GE AKTApure - Page 283

Clean the pH valve
Follow the instructions below to clean the pH valve. The calibration function is used to switch the valve
position. However, no calibration is performed.
ActionStep
Connect tubing to pH valve port W3, and direct the other end of this tubing to a waste
container.
1
Unscrew the pH electrode from the pH valve, and replace it with the dummy electrode.2
Open the System Control module and select System:Calibrate.3
Result: The Calibration dialog opens.
In the Calibration dialog, select pH from the Monitor to calibrate drop-down list.4
Press the Prepare for calibration button.5
Result: The pH valve switches to the calibration position.
Fill a syringe with approximately 10 ml of 1 M NaOH. Connect the syringe to the pH valve
port Cal, and inject the solution.
7
Fill a syringe with distilled water. Connect the syringe to the pH valve port Cal, and inject
the distilled water.
8
Press the Close button.9
Result: The pH valve switches back to the default position and the Calibration dialog
closes. No calibration is performed.
ÄKTA pure User Manual 29119969 AB 283
7 Maintenance
7.6 Maintenance when required
7.6.2 Perform System CIP