Emerson Rosemount OCX8800 Instruction Manual page 228

Instruction Manual
IM-106-880C, OI
Disassemble O
Do not attempt to replace the O
considered. If cell replacement is needed, order the O
Replacement
The O
2
screws, and anti-seize compound. The items are carefully packaged to preserve precise surface
finishes.
Do not remove items from the package until they are ready to be used.
1.
NOTE:
The pad on the end of contact/thermocouple assembly (4) will sometimes fuse to the O
2.
3.
Use care when handling contact and thermocouple assembly. The ceramic rod in this
assembly is fragile.
4.
5.
6.
7.
Remove
Eductor
Cell and Heater Strut Assembly
2
2
Parts).
cell replacement kit contains an O
Remove the four Allen cap screws (1,
cell. The cell flange has a notch that may be used to gently pry the flange away from
heater tube (3).
If the O cell is fused to the contact pad, push the O
2
(against spring pressure) and quickly twist the O
separate. If the contact pad stays fused to the cell, a new contact/thermocouple
assembly (4) must be installed.
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.
Remove screws (6), lockwashers (7), return wire (8), and heater strut assembly (9).
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.
While carefully handling new contact and thermocouple assembly (4) lay old assembly
next to new one. Transfer match marks to new assembly.
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 until all other possibilities for poor performance have been
cell replacement kit (Refer to
2
cell and flange assembly, gaskets, socket head cap
2
Figure 9-14) from the O
cell. The cell and contact pad should
2
Repair Sensor
Housing
Section 10,
cell (2). Remove the O
2
cell back into the heater tube
2
April 2017
2
cell (2).
2
20
1