Emerson Process Management 760004-A - Manual (Page 47)

Instruction Manual
760004-A
February 2002
Rosemount Analytical Inc. A Division of Emerson Process Management Maintenance and Service 4-9
Model NGA 2000 HFID
Burner Cap
Burner Cap
Retainer
Gasket
656931
Burner Base Burner Base
Combustion
Chamber
A B
O-Ring
904373
b. 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
readings.
If the analyzer module is to be operated at
the highest sensitivity, traces of such
contaminates can cause erroneous read-
ings. 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 main-
tenance must be free of contaminates.
1. Remove oven from analyzer module
per Section 4-2a.
2. Remove burner/thermal block from
oven per Section 4-2b.
3. Remove thermal block from burner
per Section 4-4a.
4. Refer to Figure 4-7A. Remove
screws (2) holding burner cap re-
tainer, remove retainer.
5. Holding burner base, lift burner cap
off of assembly, set aside, remove
gasket.
6. Refer to Figure 4-7B. Holding burner
base, lift combustion chamber off, set
aside.
Figure 4-7. Burner Disassembly