Emerson OCX 8800 Instruction Manual page 83

Instruction Manual
IM-106-880, Rev 1.0
January 2007
Figure 7-10. O Cell, Heater,
2
and Thermocouple, Exploded
View
4
6
7
8
12
11
10
1. Screw
2. O Cell
2
3. Heater Tube
4. Contact/
Thermocouple
Assembly
5. Gasket
6. Screw
7. Lockwasher
8. Return Wire
9. Heater Strut
Assembly
10. Spring Clip
11. Spring
12. Strut Bracket
3
5
Test Gas
Passage
Holes
2
1
Do not remove the O
damage the cell and platinum pad. Remove the O
Disassemble O
Do not attempt to replace the O
performance have been considered. If cell replacement is needed, order the
O cell replacement kit (Refer to Section 9, Replacement Parts).
2
The O cell replacement kit contains an O
2
socket head cap screws, and anti-seize compound. The items are carefully
packaged to preserve precise surface finishes.
9
Do not remove items from the package until they are ready to be used.
1. Remove the four allen cap screws (1, Figure 7-10) from the O
Remove the O
gently pry the flange away from heater tube (3).
NOTE
The pad on the end of contact/thermocouple assembly (4) will sometimes
fuse to the O
2
2. If the O
2
heater tube (against spring pressure) and quickly twist the O
cell and contact pad should separate. If the contact pad stays fused to
the cell, a new contact/thermocouple assembly (4) must be installed.
3. Remove and discard gasket (5). Clean the mating surface of heater
tube (3). Remove burrs and raised surfaces with a block of wood and
crocus cloth.
Use care when handling contact and thermocouple assembly. The ceramic rod in this
assembly is fragile.
4. Remove screws (6), lockwashers (7), return wire (8), and heater strut
assembly (9).
5. If replacing contact and thermocouple assembly (4), use a pencil to
mark location of spring clip (10) before removing. Squeeze tabs on
spring clip to remove. Retain spring clip and spring (11); replace if
damaged.
6. While carefully handling new contact and thermocouple assembly (4)
lay old assembly next to new one. Transfer match marks to new
assembly.
7. Carefully guide new contact and thermocouple assembly (4) through
strut bracket (12), spring (11), and spring clip (10) until spring clip
reaches pencil mark.
cell unless you are certain it needs to be replaced. Removal may
2
Cell and Heater Strut Assembly
2
cell until all other possibilities for poor
2
cell. The cell flange has a notch that may be used to
2
cell (2).
cell is fused to the contact pad, push the O
OCX 8800
cell for cell replacement only.
2
cell and flange assembly, gaskets,
2
cell back into the
2
cell (2).
2
cell. The
2
7-13