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7.6.6 Storage of the pH electrode
Maintenance interval
When pH monitoring is not used, the pH electrode can be stored in storage solution inside the pH flow
cell. If pH monitoring is not used for a week or longer, inject new storage solution into the pH flow cell
or replace the pH electrode with the dummy electrode that was installed in the pH valve on delivery.
Required material
The following materials are required:
• Syringe, 25 to 30 ml
• Storage solution (1:1 mixture of standard buffer, pH 4, and 1 M KNO
3
)
Instruction
Follow the instructions below to fill the pH flow cell with storage solution. The calibration function is
used to switch the position of the pH valve. However, no calibration is performed.
Action Step
In the System Control module, on the System menu click Calibrate. 1
Result: The Calibration dialog opens.
In the Calibration dialog, click pH on the Monitor to calibrate drop-down list. 2
Click Prepare for Calculation. 3
Result: The pH valve switches to the calibration position.
Prepare at least 10 ml storage solution by mixing equal volumes of a standard buffer,
pH 4, and a 1 M Potassium Nitrate (KNO
3
) solution.
4
ÄKTA pure User Manual 29119969 AB 291
7 Maintenance
7.6 Maintenance when required
7.6.6 Storage of the pH electrode