Emerson 3081FG - Manual (Page 22)

Instruction Manual
IB-106-3081 Rev. 1.5
September 2002
2-4 Installation Rosemount Analytical Inc. A Division of Emerson Process Management
Model 3081FG
REFRACTORY
STACK OR DUCT
METAL WALL
WELD PIPE TO
METAL WALL
1.25 NPT
2 IN. NPT
SCHEDULE 40
PIPE
CUSTOMER
SUPPLIED
ADAPTER
29750004
2 IN. NPT
SCHEDULE 40
PIPE
SYSTEM
CABLE
STACK OR DUCT
METAL WALL
ADAPTER
INSULATE IF EXPOSED
TO AMBIENT WEATHER
CONDITIONS
REFERENCE
AIR LINE
CALIBRATION
CHECK
GAS LINE
2.0 IN. (51 mm)
MIN. DIA.
Figure 2-4. Horizontal Probe Installation
3. If the optional adapter plates are not
used, a 2 in. NPT, schedule 40, pipe
nipple (Figure 2-4) should be welded to
the stack or duct wall.
When a 2 in. NPT to 1.25 NPT adapter
is threaded to the welded pipe nipple,
the adapter provides the pipe threads
needed for the probe’s process fitting.
4. Where high particulate or slag is in the
flue gas stream, it may be desirable to
inset the probe in the refractory as
shown in Figure 2-5. Use pipe cou-
plings and nipples to adjust the probe
insertion depth.