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.
This Troubleshooting Guide covers pH electrode troubleshooting whether the electrode is connected to the WEL-PH Housing
or to the WEL Transmitter Housing.
The WEL-PH Housing is a direct sensor input, which means it wires into the controller sensor input terminals.
o The WEL-PH Housing works with the W100, W600 and W900 controllers.
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.
The WEL-PH Housing and the WEL Transmitter Housing will look physically identical. To tell them apart, please look at the
end of the sensor cable (that will connect to the controller).
The WEL-PH Housing will have either 4 (No Automatic Temperature Compensation) wires, or 6 wires (Automatic Temperature
Compensation), plus a shield wire.
The WEL Transmitter Housing will have 2 wires plus a shield wire. The Auto Temp Comp is built into the housing.
4 wire WEL-PH Housing plus shield, no Auto
Temp Comp
6 wire WEL-PH Housing plus shield, has
Auto Temp Comp
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