ATI
Q46H/65 Residual Chlorine Dioxide System
Part 10
– Troubleshooting
64
O&M Manual
Rev-J (11/18)
Offset High
The sensor zero offset point is out of the
acceptable range of -25 to +25nA.
Check wiring connections to sensor. Allow
sensor to operate powered a minimum of 12
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.
ClO
2
High
The ClO
2
reading is greater than the maximum of
the User-selected range.
The ClO
2
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.
Figure 29 - Q46H Display Messges
MESSAGE
DESCRIPTION
POSSIBLE CORRECTION
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.
ClO
2
Cal Fail
Failure of ClO
2
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 250%. Perform sensor
tests as described in section 10.5. Replace
sensor if still failure.
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. If still failure, perform sensor tests as
described in section 10.5. 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.
Range Cal Fail
Failure of factory temperature calibration.
Consult factory.
Figure 30 - Q46H Display Messages (Continued)
