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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
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.
Service Personnel.
W100/W600/W900 Controller
pH Electrode Troubleshooting Guide
1
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Summary of Contents for Walchem W100
- Page 1 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...
- Page 2 The WEL Transmitter Housing is an analog input, which 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 configuration you have based on the following.
- Page 3 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. Section 1: Electrode Reading Responds Slowly Step 1: pH electrodes require periodic cleaning and calibration. ...
- Page 4 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. Section 2 (A): WEL-PH Housing + Electrode Reading is Stuck on one Value Step 1: The following are normal (expected) readings when the controller electrode input is programmed as pH, and the following configurations are in place:...
- Page 5 WEL Transmitter Housing + Electrode Reading is Stuck on one Value or Reading Erratically Note: This section is applicable to W600 and W900 controllers (not applicable to W100 controllers). The WEL Transmitter housings are: For use with ORP electrodes (cartridges), with a 4-20 mA range scaled to -500 to 1000 mV.
- Page 6 If the pH electrode has ATC, the next step is to verify the controller has the correct temperature element programmed into the Temperature Input menu, and it is reading the correct temperature. Typically, temperature element = RTD1000 Ω for Walchem pH electrodes. Temperature element: •...
- Page 7 If the resistance reading is good, yet it still displays the temperature incorrectly, the problem is with the controller front panel. If the problem is the controller front panel, please contact your supplier of Walchem equipment. Step 3: ...
- Page 8 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. Section 3 (B): WEL-Transmitter Housing + Electrode Reads Low or High Versus a Calibrated Handheld Meter;...
- Page 9 This alarm occurs if the board listed is not recognized. Possible Cause Corrective Action Poor ribbon cable connection Remove and reseat ribbon cable, cycle power Poor option card connection (not applicable to Remove and reseat the board, cycle power W100) Faulty board Replace or repair controller...
- Page 10 If the reading does not stay stable, then connect the controller to an alternate supply voltage circuit. This may necessitate temporarily running an extension cord for this test. If the reading still does not stay stable, please contact your supplier of Walchem equipment for further instructions.