Instruction Manual

748297-E June 2003

Model NGA2000 HFID

Replacing Burner Jets

Disassemble the burner only if contaminants 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 contaminates can cause erroneous readings. For best performance, replace the burner jet follows:

WARNING

BURNER CONTAMINATION

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.

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

A

Burner Cap

 

Retainer

Burner Cap

Gasket 656931

B

Combustion Chamber

O-Ring 904373

Burner Base

Burner Base

Figure 4-7. Burner Disassembly

4-8 Maintenance and Troubleshooting

Rosemount Analytical Inc. A Division of Emerson Process Management