Emerson Rosemount Oxymitter 4000 Reference Manual page 155

July 2018
Contact and Thermocouple Assembly Replacement
See Figure 9-11.
See Figure 9-11.
1. Remove the cell per "Cell Replacement", steps 1 through 5.
2. Remove the heater strut assembly per "Heater Strut Replacement",
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 "Cell Replacement", steps 7
through 12.
8. Slide the heater strut assembly into the probe per the instructions in
"Heater Strut Replacement", 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 "Probe Installation" in Section 2: Installation 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.
Figure 9-11. Contact and Thermocouple Assembly Replacement
Maintenance and Service
Hazardous Area Oxymitter 4000
1. Remove the cell per "Cell Replacement", steps 1 through 5.
2. Remove the heater strut assembly per "Heater Strut Replacement", 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 "Cell Replacement", steps 7 through
12.
8. Slide the heater strut assembly into the probe per the instructions in
"Heater Strut Replacement", 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 "Probe Installation" in Section 2: Installation 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.
Strut
Tube
Supports
Contact And
Thermocouple
Assembly
Spring
Clip
Spring
Rosemount Oxymitter 4000
155