Instruction manual

111
The pH dead band is set too high. Go to the pH Output Page and change the dead
band to be as low as possible to prevent the
pH relay from chattering. If the pH reading
fluctuates by +/- 0.02 pH units, then a dead
band of 0.05 is sufficient.
Faulty metering pump wiring. Correct metering pump wiring.
pH output relay is stuck closed. Replace the relay interface board.
ORP High Alarm
This error message indicates the ORP reading exceeds the user-programmed maximum allowable
value.
Possible Causes Corrective Actions
Assuming you are feeding an oxidizer:
The programmed value is too close to the Go to the ORP Input Page and make sure ORP
set point. that the High Alarm Limit is more than 50 mV
above the set point plus the dead band.
Slow ORP electrode response, dirty Clean and calibrate the ORP electrode as
described in Section 7.4 above. If the
calibration fails, refer to the ORP Calibration
Failure troubleshooting above.
electrode.
Metering pump set at too high a flow rate. Reduce the flow rate of the metering pump.
Metering pump is siphoning. Repair or install an anti-siphon valve.
If a brominator, solenoid valve is stuck open. Repair or replace the solenoid valve.
The ORP dead band is set too high. Go to the ORP Output Page and change the
dead band to be as low as possible to prevent
the ORP relay from chattering. If the ORP
reading fluctuates by +/- 2 mVs, then a dead
band of 5 mV is sufficient.
Faulty metering pump wiring. Correct wiring.
ORP output relay is stuck closed. Replace the relay interface board.