Instruction Manual
748441-D
April 2002
6-2 Troubleshooting
Rosemount Analytical Inc. A Division of Emerson Process Management
Model CAT100
Error Code
Possible Reasons
Check / Remedy
1. Start-up of A/D conversion in
temperature channel absent.
Switch analyzer of and then on again.
Temperature compensation
inoperative.
2. Internal 6 VDC supply absent
Check X14 on BKS PCB.
1. Incorrect zero gas in use.
Check zero gas in use.
2. IR
channel
photometer
section contaminated.
Check analysis cell and windows for
contamination. See Section 5-4f, page 5-
20.
Channel 1
Channel 2
Tolerance error
Zero gas value deviates
more than 10% of
measuring range from zero.
3. Analyzer
not
calibrated.
Switch off the tolerance check before
starting an adjustment. See Section 3-3f,
page 3-8.
1. Incorrect
nominal
value.
Enter the correct nominal value. See
Section 3-5b, page 3-13.
2. Incorrect span gas in use.
Check span gas in use.
Use another or new gas bottle.
Enter the correct nominal value.
3. IR
channel
photometer
section contaminated.
Check analysis cell and windows for
contamination. See Section 5-4f, page 5-
20.
Channel 1
Channel 2
Tolerance error
Span gas deviates more
than 10% from nominal
value.
4. Analyzer
not
calibrated.
Switch off the tolerance check before
starting an adjustment. See Section 3-3f,
page 3-8.
Channel 1
Channel 2
Measuring value more than
10% over full scale range.
1. Concentration of measuring
gas too high.
Check concentration of measuring gas.
Use another analyzer suitable for the
concentration range involved.
1. Timeout for serial interface
XON.
XON character absent. Timeout > 60 s.
