Emerson Rosemount OCX8800A - Page 279

Install O
2
cell and heater strut assembly
Procedure
1. Rub a small amount of anti-seize compound on both sides of new gasket.
See Figure 10-23
2. Apply anti-seize compound to threads of O
2
cell and heater strut assembly
and sensor housing.
CAUTION
EQUIPMENT DAMAGE
Stripped threads on the O
2
cell and heater strut assembly can allow gas
leakage. Gas leakage can affect the O
2
measurements and calibration.
Avoid over-tightening the O
2
cell and heater strut assembly.
3. Install O
2
cell and heater strut assembly in sensor housing. Snug up, but do
not over-tighten the assembly.
4. Reconnect the lead wires from O
2
cell, heater, and thermocouple to the
sensor housing terminal blocks.
Refer to Figure 10-24
5. Install reference air tube in sensor housing.
See Figure 10-23
Make sure that the open end of reference air tube extends into heater tube
of O
2
cell and heater strut assembly.
Install terminals insulator and cover
Procedure
1. Install insulator over uppermost terminal blocks. Position one side of
insulator against terminal blocks and snap terminal marking plate to
mating stand-off.
See Figure 10-23
2. Position opposite side of insulator and secure with related marking plate.
3. If removed, install cover gasket. Screw cover (A) onto sensor housing (H).
Tighten cover firmly.
4. Align locking clip with gap between cover ribs.
5. Loosen screw and slide locking clip fully into gap between cover ribs.
Retighten screw.
Leak test sensor housing
Procedure
1. Install ¼ national pipe thread (NPT) cap on dilution air fitting. Install a ¼ NPT
cap on sample tube (C, Figure 10-13) or plug ¼ NPT sample inlet port.
Manual Maintenance and service
00809-0500-4880 December 2022
Rosemount OCX8800A 279