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Instruction Manual
IM-106-5500, Original Issue
August 2005
6-7
CCO 5500
Table 6-3. Operational
Problems
Output reading permanently zero or full scale
Possible Cause Test Result Action
Incorrect normalizing
parameter setting
Enter parameter mode
and ensure all
parameters are as
required
Parameters
correct
Proceed to next
possible cause
Parameters
incorrect
Enter correct
parameters
Incorrect calibration
(Set Cal value) zero
gas level
Enter diagnostic mode
and observe the Y (60)
figure
1800 <Y <2010 Instrument OK - true
level of gas in duct
(output permanently
zero)
Y <1800 Proceed to next
possible cause
Detector levels low or
saturated
Enter diagnostic mode
and check the detector
levels and saturation
count
Detector levels
OK
Proceed to next
possible cause
Detector levels
out of tolerance
Reconfigure the
instrument and
consult the
fault-finding table
again
Output circuitry failure Enter setup mode
(configure output and
attempt to set zero and
span
Output responds
correctly
Reconfigure the
instrument and
consult the
fault-finding table
again
Output does not
respond correctly
Replace signal
processor
Averages not updated
Possible Cause Test Result Action
Fault condition exists Enter diagnostic mode
and check fault
condition
Fault condition
exists
Refer to Section 4,
Fault Condition
No fault condition Proceed to next
possible cause
Plant status contact in
signal processor has
been made
Check plant status
input LED in signal
processor
LED off Operation correct -
stable gas level
LED on Plant status in use -
instrument will not
update until plant on