ATI
Q46P pH System
Part 8 – Maintenance and Troubleshooting
66
O&M Manual
Rev-F (8/17)
The following messages will appear as items on the Fault List:
MESSAGE
DESCRIPTION
POSSIBLE CORRECTION
Sensor High
The raw signal from the sensor is too
high.
Check wiring connections to sensor.
Sensor Low
The raw signal from the sensor is too
low.
Check wiring connections to sensor.
pH too High
The pH reading is > 14.00 pH.
The pH reading is over operating limits.
pH too Low
The pH reading is < 0.00 pH.
The pH reading is under operating limits.
Temp High
The temperature reading is > 110 ºC.
The temperature reading is over operating
limits. Check wiring and expected temp
level. Perform RTD test as described in
sensor manual. Recalibrate sensor
temperature element if necessary.
Temp Low
The temperature reading is < -10 ºC
The temperature reading is under operating
limits. Check wiring and expected temp
level. Perform RTD test as described in
sensor manual. Recalibrate sensor
temperature element if necessary.
TC Error
TC may be open or shorted.
Check sensor wiring and perform RTD test
as described in sensor manual.
Meas Break
Leakage detected on measuring
electrode of sensor.
Measuring electrode glass may be cracked
or broken. Electrical noise may falsely trip
this diagnostic. Turn off glass diagnostic
feature and see if sensor operates
correctly. If it does not, sensor must be
replaced.
Ref Break
Leakage detected on reference
electrode of sensor.
Reference glass electrode may be cracked
or broken. Electrical noise may falsely trip
this diagnostic. Turn off glass diagnostic
feature and see if sensor operates
correctly. If it does not, sensor must be
replaced.
