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
Section 3: Sensor Reads Low or High Versus a Calibrated Handheld
Meter; Cannot Calibrate
Step 1:
Perform a sensor calibration in accordance with the
controller manual.
If the sensor cannot be calibrated, first thing to try is
clean the sensor.
If the sensor cannot be calibrated after cleaning,
proceed to Step 2.
Step 2:
Go to the Sensor mV menu. Resetting the calibration settings.
Go into the Sensor menu, go to Sensor Type, change it from ORP to pH, hit ENTER to save this
change. Go back into the Sensor Type menu, change it from pH back to ORP, hit ENTER to save
this change.
Try to calibrate the sensor in accordance with the controller manual. If you still cannot
calibrate, proceed to Step 3.
Step 3:
Go to the Sensor mV menu. Resetting to factory defaults.
Proceed as follows depending on which controller model you have.
For a WM1 or WIND controller, go into the Sensor Input menu, and press the reset defaults
button. Proceed to Section 4.
For a WPH400 controller reset the controller to factory defaults as follows.
Caution: Resetting defaults erases any user defined settings programmed into the
controller.
Power down the controller, press and hold the ENTER and EXIT keys, power up the
controller keeping the ENTER and EXIT keys pressed in until the controller boots up.
When the display comes up, you will be asked if you want to reset defaults, release the
ENTER and EXIT keys and then press ENTER for yes. Re-check the mV and pH values. If the
pH and mV values do not correlate, then either the preamp or the electrode is faulty.
Proceed to Section 4.
