ATI
Q45D Portable Dissolved Oxygen
Part 9 - Service
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 and allow sensor to equilibrate in
ambient air. Check the mv. display to see if
sensor output is stable.
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 of -40 to +40 mV.
Check wiring connections to sensor. Allow
sensor to operate powered a minimum of 4
hours prior to first zero cal.
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.
D.O. High
The dissolved oxygen reading is greater than the
maximum of the User-selected range.
The dissolved oxygen reading is over operating
limits. Set measuring range to the next highest
level.
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.
D.O. Cal
Fail
Failure of dissolved oxygen calibration. FAIL
icon will not extinguish until successful calibration
has been performed, or 30 minutes passes with
no keys being pressed.
Clean sensor redo zero and span calibration.
If still failure, sensor slope may be less than
25% or greater than 500%. Perform sensor
tests as described in section 8.4. Replace
sensor if still failure.
T.C. 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. If still failure, perform sensor tests as
described in section 8.4. Replace sensor if still
failure. .
Figure 11 - Q45D Display Messages
