GE pH/C-900 Operating Instructions Manual page 61

pH Measurement
Problem
No response to pH
changes
Small response to pH
changes
Slow pH response or Cali-
bration impossible
Monitor pH/C-900 Operating Instructions 29-0549-25 AB
Corrective action
Check that the electrode cable is connected properly
•
to the rear of the instrument.
The electrode glass membrane may be cracked.
•
Replace the electrode.
Clean the pH electrode according to Section 6.4
•
Cleaning the pH electrode, on page 57 and recali-
brate.
If the problem remains, replace the pH electrode.
•
Check the pH electrode tip. If it is contaminated
•
clean the electrode following the instructions in
Section 6.4 Cleaning the pH electrode, on page 57.
If the membrane has dried out, the electrode may
•
be restored by soaking it in buffer overnight.
Clogged liquid junction. Refer to Section 6.4 Cleaning
•
the pH electrode, on page 57.
7 Troubleshooting
7.2 Problems and corrective actions
61