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ELECTRODE TROUBLESHOOTING
| Problem | Possible Causes | Solution |
|---|---|---|
Drift |
Junction Blocked (IJ series only) | Remove sleeve. Clean glass stem and sleeve. |
| Membrane not Clean | Remove sleeve. (IJ series only) Clean membrane. | |
| Membrane Aged or Damaged (e.g. by Abrasion) | Allow longer measuring time or replace | |
| Electrode Polarised | Replace electrode | |
Noisy |
Bubble in Membrane | Flick electrode downward. |
| Poor connection to Meter | Check connection | |
| Junction not immersed (IJ series only) | Lower electrode into solution below level of junction | |
| Insufficient Electrolyte (IJ & P Series only) | Refill electrolyte (KCl). | |
Low Slope (<94%) |
Contaminated Buffers | Replace buffers |
| Membrane not clean | Remove Sleeve (IJ Series only) Clean glass membrane. | |
| Membrane Aged | Allow more time for stabilisation, or replace | |
| Electrode Polarised | Replace electrode | |
Incorrect Sample Reading after calibration |
Group Loop. Often Occurs in Process Systems. | Verify by removing the sample from its environment and measuring in a glass beaker. may require special circuitry. |
| Junction (IJ Series) or Membrane not clean | Remove Sleeve (IJ Series only) Clean glass junction/membrane. | |
Displays pH7 for all Buffers |
Electrical Short | Check Connector |
| Internal Short | Replace electrode | |
Displays pH4-5 for all Buffers |
Membrane or Stem Cracked | Replace electrode |
Not within Tolerance (±20mV)
|
Contaminated Standards | Replace standards |
| Correlating to the Wrong Reference Electrode | Calculate what the standard would read using a saturated KCl Ag/AgCl reference. | |
| Platinum not clean | Clean Platinum. If metals (e.g. copper and zinc) are plated onto the platinum tip use dilute (0.1M) nitric acid to clean. | |
| Electrode Polarised | Replace electrode | |
Displays 0mv for all solutions |
Electrical Short | Check Connector |
| Internal Short | Replace electrode | |
Displays off Scale |
Noise | See Symptom: Noisy |
Not the problem/answer you were looking for? Just contact us and we will be happy to help.
T. F.