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.
W100/W600/W900 Controller
pH Electrode Troubleshooting Guide
Table of Contents
Electrode Reading Responds Slowly
Electrode Reading is Stuck on one Value
Electrode Reads Low or High Versus a Calibrated Handheld Meter; Cannot Calibrate
Note: pH electrodes are like batteries and their output voltage will change with time, even if they are not being
used. The useful life of a pH electrode is limited, and that time varies with the conditions it’s exposed to in the
application. Electrode life may be as short as one week in some aggressive applications (extreme temperature, pH
and/or pressure, dirty water, harsh chemicals) or more than a year in other applications with potable quality water at
room temperature.
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