Emerson Process Management 760004-A - Manual (Page 42)

Instruction Manual
760004-A
February 2002
4-4 Maintenance and Service Rosemount Analytical Inc. A Division of Emerson Process Management
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 sol-
der 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.