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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

Section 1 Electrode Reading Responds Slowly

Section 2 Electrode Reading is Stuck on one Value

Section 3 Electrode Reads Low or High Versus a Calibrated Handheld Meter; Cannot Calibrate

Section 4 Electrode Fault

Section 5 pH Reading is Unstable

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.

Содержание W100

Страница 1: ...ads Low or High Versus a Calibrated Handheld Meter Cannot Calibrate Section 4 Electrode Fault Section 5 pH Reading is Unstable Note pH electrodes are like batteries and their output voltage will chang...

Страница 2: ...ich means it wires into the controller analog input terminals o The WEL Transmitter Housing only works with the W600 and W900 controllers not with the W100 controller You can determine which configura...

Страница 3: ...ill 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 isopr...

Страница 4: ...ith the WEL PH housing wired into the electrode input terminals in the controller and the electrode threaded into the housing the reading should be the pH value of the solution as verified by a second...

Страница 5: ...t is programmed as pH and the following configurations are in place With nothing connected to the analog input terminals in the controller the reading should be about 0 mV 7 pH With just the WEL Trans...

Страница 6: ...00 for Walchem pH electrodes Temperature element Some electrodes do not have ATC If you are not using ATC in the Inputs menu Temperature Settings scroll to Element and select No Element And whatever t...

Страница 7: ...ctrode Input menu look at the pH Raw Value and the Gain Value What is the calibration range that you are allowed to go to o The controller shows us a current pH reading and a raw pH reading o This raw...

Страница 8: ...rect using a multimeter please check the mA signal coming from the sensor and into the controller as follows Place the WEL Transmitter Housing plus Electrode in the system tee water or place it in a b...

Страница 9: ...condition with stop control of any output using the electrode Possible Cause Corrective Action Electrode wires shorted Disconnect short Faulty electrode Replace electrode Faulty controller Replace or...

Страница 10: ...ater does the reading stay stable If the reading does not stay stable this can indicate a ground loop A ground loop could cause readings to be stuck at a high or low value Or there is some electrical...