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Maintenance and service
April 2023
Do not attempt to replace the O
been considered. If cell replacement is needed, order the O
Replacement
The O
head cap, screws, and anti-seize compound. The items are carefully packaged to preserve
precise surface finishes.
Do not remove items from the package until you are ready to use them.
Procedure
1. Remove the four Allen cap screws (M,
2. If the O
3. Remove and discard the gasket (J). Clean the mating surface of the heater tube (I).
4. Remove screws (B), lockwashers (C), return wire (D), and heater strut assembly (E).
5. If replacing contact and thermocouple assembly (A), use a pencil to mark the
6. While carefully handling the new contact and thermocouple assembly (A), lay the old
7. Carefully guide the new contact and thermocouple assembly (A) through the strut
Disassemble COe sensor assembly
Procedure
1. Carefully remove screws (I,
240
parts).
cell replacement cell contains an O
2
O
cell.
2
The cell flange has a notch that may be used to gently pry the flange away from the
heater tube (I).
Note
The pad on the end of the contact/thermocouple assembly (A) will sometimes fuse
to the O
cell (L).
2
cell is fused to the contact pad, push the O
2
(against spring pressure) and quickly twist the O
The cell and contact pad should separate. If the contact pad stays fused to the cell,
you will need to install a new contact/thermocouple assembly (A).
Remove burrs and raised surfaces with a block of wood and a crocus cloth.
CAUTION
Equipment damage
The ceramic rod in this assembly is fragile.
Use care when handling the contact and thermocouple assembly.
location of the spring clip (H) before removing. Squeeze tabs on the spring clip to
remove. Retain the spring clip and spring (G); replace if damaged.
assembly next to the new one. Transfer match marks to the new assembly.
bracket (F), spring (G), and spring clip (H) until the spring clip reaches the pencil
mark.
the sensor holder (E). Remove and discard the gasket (F).
cell until all other possibilities for poor performance have
2
cell and flange assembly, gaskets, socket
2
Figure
10-23) from the O
2
Figure
10-24), lockwashers (H), and COe sensor (A) from
00809-0500-4881
cell replacement kit (refer to
2
cell (L). Remove the
2
cell back into the heater tube
2
cell.
Emerson.com/Rosemount
Manual
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