Instruction manual

NGA 2000 HFID
Instruction Manual
HAS64E-IM-HW
September 2008
4 - 4 Maintenance and Service Emerson Process Management GmbH & Co.OHG
PREAMP CONNECTORS !
The electrical preamp connectors are fragile, handle
with care to avoid breaking solder connection!
CAUTION
Figure 4-3: Removal of Oven from Chassis
4-3 OVEN
Though the oven can be replaced as a complete unit,
all internal components are field replaceable.
a. Removal
Refer to Figure 4-3, disconnect the oven´s three gas
lines and seven electrical cables, noting location of
mating connectors for re-installation.
NOTE
DO NOT remove the fittings from the gas lines on
the detector.
Remove the two hex nuts securing the oven to
the chassis and the two screws securing oven to
the rear panel. Lift oven assembly from analyzer.
b. Disassembly
1. Refer to Figure 4-4A. Remove the tour retaining
screws on the oven cover, remove cover.
2. Removethe 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.
4. Refer to Figure 4-4B. Remove the two nuts and
washers form the electrical 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 dis-
connecting exhaust.
Reverse Procedure for installation.
Oven Assembly
Brief Description Part Number
9.7 cc/min. @ 3.5 psig 659551
2.5 cc/min. @ 3.5 psig 658338