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.
2
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
