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pH Electrode Model 60120B Operation
The Following information applies to the Epoxy Body, Sealed Reference Combination pH Electrode
Model 60120B.
Electrode Considerations
1. The 60120B pH electrode is recessed in the polymer body allowing it to rest against the bottom
of a beaker without damaging the glass bulb. This eliminates the need for electrode holders and
allows the probe to be used as a stirring rod. This sealed reference design eliminates the need
for adding filling solutions (minimizing "dry-out") and can be used in up to 100 psig systems
without external pressurization.
2. The Electrode should remain in its bottle or cap until used.
3. If bubbles are seen in the bulb area, hold the electrode by its cap and shake downwards until
bubbles disappear.
4. To improve speed of response, vigorously stir the electrode in the sample, buffer, or rinse
solution.
5. After exposure to a sample, buffer, or rinse solution, shake the electrode with a snap motion to
remove residual drops of solution.
6. Use part of the sample/buffer to be tested next as a rinse solution whenever possible.
7. When calibrating, use a buffer as close as possible to the expected pH of the sample.
8. Keep buffers and samples at the same temperature to avoid temperature effects.
9. pH readings stabilize at various rates; allow time for readings to stabilize.
10. Electrodes deteriorate over time. If accuracy falls to 10% (slope), the electrode should be
cleaned. If no improvement is observed, replace the electrode.
Electrode Calibration and Cleaning
Refer to the earlier section ‘Calibration and Operation’ for calibration details. Refer to the section
below ‘Maintenance and Troubleshooting’ for details on electrode cleaning.
Electrode Storage
The electrode can be stored in the soaker bottle or wetting cap. For the storage bottle, slide the
cover onto the electrode, replace the O-ring, and insert electrode into the bottle firmly tightening the
cap. Ensure that the bottle or cap is filled with a pH 4 buffer solution.
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