Emerson Process Management 760004-A WARNING, Refer to Figure, Refer to Figure, 760004-AFebruary, BURNER CONTAMINATION, b.Replacing Burner Jets, Figure 4-7.Burner Disassembly

Model NGA 2000 HFID

Instruction Manual

760004-A February 2002

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:

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.

WARNING

BURNER CONTAMINATION

Do not handle internal parts of the burner with bare hands. All tools used for maintenance must be free of contaminates.

6.Refer to Figure 4-7B. Holding burner base, lift combustion chamber off, set aside.

A	Burner Cap
	Retainer

Burner Cap

Gasket 656931

B

Combustion Chamber

O-Ring 904373

Burner Base Burner Base

Figure 4-7. Burner Disassembly

Rosemount Analytical Inc. A Division of Emerson Process Management Maintenance and Service 4-9