Common Issues
Sensor reading is not accurate: Re-calibrate sensor, clean sensor, or replace sensor electrode.
Sensor output in unstable: Stray current may be affecting readings. Check ground.
No pH reading: Check cable connection. Re-calibrate pH. Replace electrode sensors.
No temp reading: Check cable connection. Replace the sensor electrode.
Electricals
The APH2O will not power up. Check the power source or try a different power source. Check to ensure the power cable is properly inserted in the power receptacle.
No signal from sensor. Remove sensor and check connections. Clean sensor.
Check that all signal cables are shielded and properly grounded. Ensure signal wiring is not located or run next to high voltage power or equipment generating EMI. Ensure power wiring to the pump is clean/conditioned.
The 4-20mA signal is dropping or incorrect. Check the cables integrity and proper connection to the unit. Check that all signal cables are shielded and properly grounded. Ensure signal wiring is not located or run next to high voltage power or equipment generating EMI. Ensure power wiring to the pump is clean/conditioned.
The Display reads Error code. Follow instructions on the unit and contact the factory for assistance. Some error codes may be corrected with a current Firmware Update. See System section for details on firmware updates.
Instrument Alarms and Descriptions
Please refer to the instrument alarms and descriptions table when troubleshooting the APH2O online inspection system issues an alarm or indicates abnormal measurement data.
