ATI
Q46UV UV254/Turbidity Monitor
Part 9
– Troubleshooting
52
O&M Manual
Rev-D (11/19)
9.31 Display Messages
The Q46 instrument provides 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 2000
Entry failed, maximum user value allowed is
2000.
Reduce value to
≤ 2000
Min is 20
Entry failed, minimum value allowed is 20.
Increase value to
≥ 20
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 readings to fully stabilize, do not
handle sensor or cable during calibration.
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.
Locked!
Transmitter security setting is locked.
Enter security code to allow modifications to
settings.
Unlocked!
Transmitter security has just been unlocked.
Displayed just after security code has been
entered.
Offset High
The sensor zero offset point is out of the
acceptable range.
Check wiring connections to sensor. Check
optical surfaces for fouling.
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.
Temp High
The temperature reading is > 55ºC.
The temperature reading is over operating
limits.
Temp Low
The temperature reading is < -10 ºC
Same as “Temp High” above.
TC Error
TC may be open or shorted.
Check sensor wiring. Check j-box connections.
Cal Fail
Failure of UV or turbidity calibration. FAIL icon
will not extinguish until successful calibration has
been performed, or 30 minutes passes with no
keys being pressed.
Clean sensor and redo span calibration. If still
failure, sensor slope may be less than 80% or
greater than 120%. Replace sensor failure
persists.
TC Cal Fail
Failure of temperature calibration. FAIL icon will
not extinguish until successful calibration has
been performed, or 30 minutes passes with no
keys being pressed.
Clean sensor, check cal solution temperature
and repeat sensor temp calibration. TC
calibration function only allows adjustments of
+/- 6 ºC. Replace sensor if still failure. .
EPROM Fail
Internal nonvolatile memory failure
System failure, consult factory.
Chcksum Fail
Internal software storage error.
System failure, consult factory.
Display Fail
Internal display driver fail.
System failure, consult factory.
Figure 22 - Display Messages
