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Instruction Manual
748297-E
June 2003
4-8 Maintenance and Troubleshooting Rosemount Analytical Inc. A Division of Emerson Process Management
Model NGA2000 HFID
Replacing Burner Jets
Disassemble the burner only if contami-
nants are evident. Combustion products
or other contaminates which accumulate
inside the burner may form electrical
leakage paths between the collector and
the burner contact, resulting in noisy read-
ings.
If the analyzer module is to be operated at
the highest sensitivity, traces of such con-
taminates can cause erroneous readings.
For best performance, replace the burner
jet follows:
WARNING
BURNER CONTAMINATION
Do not handle internal parts of the
burner with bare hands. All tools used
for maintenance must be free of con-
taminates.
1. Remove oven from analyzer module
per Section 4-2a on page 4-3.
2. Remove burner/thermal block from
oven per 4-2b on page 4-4.
3. Remove thermal block from burner
per Section 4-2c on page 4-7.
4. Refer to Figure 4-7A below. Remove
screws (2) holding burner cap re-
tainer, remove retainer.
Figure 4-7. Burner Disassembly
Burner Cap
Burner Cap
Retainer
Gasket
656931
Burner Base
Burner Base
Combustion
Chamber
A
B
O-Ring
904373