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Instruction Manual
IM-106-5500, Original Issue
August 2005
CCO 5500
6-6
Modulation frequency out of range
Possible Cause Test Result Action
Chopper motor speed
out of range
Adjust chopper motor
speed
Mod. Frequency
in range
No further action
Unable to adjust Proceed to next test
Monitor ref. waveform
across 10 and 11 in
power supply using
oscilloscope
30 - 45 Hz
waveform OK
Contact your
Rosemount Analytical
supplier
<30 or >45 Hz -
waveform
incorrect
Contact your
Rosemount Analytical
supplier
Set Call out of range
Possible Cause Test Result Action
Calibrated with
incorrect target value
or under fluctuating
gas level
Calibrate with correct
target value
Cal factor in range No further action
Cal factor out of
range
Proceed to next
possible cause
Poor alignment /
window contamin-
ation / path obscured
Proceed as for low
detector level
Cal factor in range No further action
Cal factor out of
range
Proceed to next
possible cause
Tx gas cell drive failure Proceed as for low
detector level
Cal factor in range No further action
Cal factor out of
range
Proceed to next
possible cause
D2 detector/circuit
failure
Check D2 signal level OK Proceed to next
possible cause
Not OK Proceed to next test
Monitor D2 signal from
Rx
OK Contact your
Rosemount Analytical
supplier
Not OK Contact your
Rosemount Analytical
supplier
Transmitter gas cell
failure
Replace Tx gas cell Cal factor in range No further action
Cal factor out of
range
Proceed to the next
possible cause
Receiver gas cell
failure
Replace Rx gas cell Cal factor in range No further action
Cal factor out of
range
Contact your
Rosemount Analytical
supplier