Instruction Manual

760004-A February 2002

Model NGA 2000 HFID

b.Disassembly

1.Refer to Figure 4-4A. Remove the four retaining screws on the oven cover, remove cover.

2.Remove the two screws and one nut securing the outer oven front panel to the outer oven, remove front panel.

3.Remove the nuts and ferrules from sample in and sample bypass out.

CAUTION

PREAMP CONNECTORS

The electrical preamp connectors are frag- ile, handle with care to avoid breaking solder connection.

4.Refer to Figure 4-4B. Remove the two nuts and washers from the elec- trical preamp connectors on the inner oven front panel. Do not unsolder these connections.

5.Unscrew the three screws from inner front panel and remove it.

6.Refer to Figure 4-4C. Remove the two hex nuts securing the burner to the bottom of the inner oven.

7.Disconnect the sample input and output bypass fittings.

8.Lift the burner/thermal block up and out, while disconnecting exhaust.

Reverse procedure for installation.

4-4

Maintenance and Service

Rosemount Analytical Inc. A Division of Emerson Process Management