CAUTION: There are live circuits inside the controller even when the power switch is in the
OFF position! Servicing and troubleshooting the controller must be performed by Qualified
Service Personnel.
3
Section 1: Electrode Reading Responds Slowly
Step 1:
pH electrodes require periodic cleaning and calibration.
The method of cleaning the electrode will depend upon the coating, as well as the
materials of construction of the electrode. Do not use a solvent that will attack the
electrode.
Oily coatings should be removed with a mild detergent or isopropyl alcohol.
Hard scales such as calcium carbonate can usually be removed with a dilute
hydrochloric acid solution.
Soft coatings can be removed using a soft cloth or soft toothbrush.
A two-point calibration should always be performed after cleaning the electrode.
Step 2:
If cleaning does not speed up the electrode's response
Replace the electrode.
