ATI
PQ45P pH System
Part 9
– Troubleshooting
36
O&M Manual
Rev-B (7/15)
8.3
Display Messages
The Q45 Series instruments provide a number of diagnostic messages which indicate problems
during normal operation and calibration. These messages appear as prompts on the secondary
line of the display or as items on the Fault List.
MESSAGE
DESCRIPTION
POSSIBLE CORRECTION
Max is 200
Entry failed, maximum user value allowed is 200.
Reduce value to
≤
200
Min is 200
Entry failed, minimum value allowed is 200.
Increase value to
≥
200
Cal Unstable
Calibration problem, data too unstable to
calibrate. Icons will not stop flashing if data is too
unstable. User can bypass by pressing ENTER.
Clean sensor, get fresh cal solutions, allow
temperature and conductivity readings to fully
stabilize, do not handle sensor or cable during
calibration.
Slope HIGH
Sensor slope calibration is less than 80%
Get fresh cal solutions, allow temperature and
pH readings to fully stabilize, check for correct
buffer values.
Slope LOW!
Sensor slope from calibration is less than 80%
Clean sensor, get fresh cal solutions, allow
temperature and pH readings to fully stabilize,
check for correct buffer values.
Offset High
Sensor offset from calibration is less than -90 mV
or greater than + 90 mV.
Clean or replace saltbridge, replace reference
cell solution, clean sensor, get fresh cal
solutions, allow temperature and pH readings
to fully stabilize, check for correct buffer
values.
Out of Range
Input value is outside selected range of the
specific list item being configured.
Check manual for limits of the function to be
configured.
Sensor High
The raw signal from the sensor is too high and
out of instrument range.
Check wiring connections to sensor.
Sensor Low
The raw signal from the sensor is too low.
Check wiring connections to sensor.
pH too High
pH too Low
The pH reading is > 14.00 pH.
The pH reading is < 0.00 pH
The pH reading is over operating limits.
The pH reading is under operating limits.
Temp High
The temperature reading is > 55ºC.
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
Same as “Temp High” above.
TC Error
TC may be open or shorted.
Check sensor wiring and perform RTD test as
described in sensor manual. Check j-box
connections.
Locked!
Transmitter security setting is locked.
Enter security code to allow modifications to
settings.
