Emerson Process Management OXYMITTER 4000 - Manual (Page 136)

Instruction Manual
IB-106-340C Rev. 4.1
July 2004
9-18 Maintenance and Service Rosemount Analytical Inc. A Division of Emerson Process Management
Hazardous Area Oxymitter 4000
diffusion element into seat. Do not
get any cement on upper part of
ceramic diffusion element. Ensure
complete penetration of cement
around 3 grooves in hub. Cement
should extrude from opposite hole.
Wipe excess material back into
holes and wipe top fillet of cement
to form a uniform fillet. (A Q-Tip is
useful for this.) Clean any excess
cement from hub with water.
(j) Allow filter to dry at room tem-
perature overnight or 1 to 2 hours
at 93°C (200°F).
(k) Wipe a heavy layer of anti-seize
compound onto the threads and
mating surfaces of the flame arre-
stor, diffusion hub, and probe tube.
(l) Assemble flame arrestor and diffu-
sion hub with two pin spanner
wrenches. Torque to 14 N·m (10 ft-
lbs). Secure with hub retaining
setscrew.
(m) On systems equipped with abra-
sive shield, install dust seal gas-
kets with joints 180° apart.
(n) Reinstall vee deflector, orienting
apex toward gas flow. Apply anti-
seize compound to setscrews and
tighten with hex wrench.
(o) Reinstall probe on stack flange.
j. Contact and Thermocouple Assembly
Replacement
See Figure 9-11.
1. Remove the cell per paragraph 9-4h,
steps 1 through 5.
2. Remove the heater strut assembly per
paragraph 9-4g, steps 3 through 8.
3. Use a pencil to mark locations of the
spring clips on the ceramic rod of the
contact and thermocouple assembly.
4. Squeeze the tabs on the spring clips
and pull the contact and thermocouple
assembly out of the heater strut. Retain
the spring clips and spring; replace if
damaged.
5. While very carefully handling the new
contact and thermocouple assembly,
lay the old assembly next to the new
one. Transfer the pencil marks to the
new rod. Throw away the old contact
and thermocouple assembly.
6. Carefully guide the new contact and
thermocouple assembly through the
spring, spring clips (held open by
squeezing the tabs), tube supports,
and heater support of the heater strut
assembly until the spring clip reaches
the pencil mark.
7. Install the cell per the instructions in
paragraph 9-4h, steps 7 through 12.
8. Slide the heater strut assembly into the
probe per the instructions in paragraph
9-4g, steps 9 through 14.
9. On systems equipped with an abrasive
shield, install the dust seal gaskets,
with joints 180° apart.
10. Follow instructions in paragraph 2-1b
to install the Hazardous Area Oxymitter
4000 into the stack or duct. If there is
an abrasive shield in the stack, make
sure the dust seal gaskets are in place
as they enter the 15° reducing cone.
26310022
STRUT
TUBE
SUPPORTS
CONTACT AND
THERMOCOUPLE
ASSEMBLY
SPRING
CLIP
SPRING
Figure 9-11. Contact and Thermocouple Assembly
Replacement