GE AKTApure - Replace the Ph Electrode

7.5.2 Replace the pH electrode
Maintenance interval
Replace the pH electrode every six months, or when required.
Required material
The following materials are required:
•
pH electrode
•
Deionized water
•
Standard buffer pH 4
Instruction
CAUTION
pH-electrode. Handle the pH-electrode with care. The glass tip may break and cause
injury.
Follow the instructions below to replace the pH electrode.
ActionStep
Disconnect the pH electrode cable of the used pH electrode from the connection on the
front of the pH valve.
1
Unscrew the nut of the pH electrode by hand, and pull the used electrode away.2
Unpack the new pH electrode. Remove the cover from the tip of the new pH electrode.
Make sure that the electrode is not broken or dry.
3
Prior to first use of the electrode, immerse the glass bulb in deionized water for 30 minutes
and then in a standard buffer, pH 4, for 30 minutes.
4
Carefully insert the new pH electrode into the pH flow cell. Tighten the nut by hand to
secure the electrode.
5
Connect the pH electrode cable of the new electrode to the connection on the front of
the pH valve.
6
Calibrate the new pH electrode, see Section 7.7.1 Calibrate the pH monitor, on page 303.7
ÄKTA pure User Manual 29119969 AB 275
7 Maintenance
7.5 Semiannual maintenance
7.5.2 Replace the pH electrode