2. Apply anti-seize compound to threads of O
2
cell and heater strut assembly (P) and
sensor housing (H).
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 (P) in sensor housing (H). 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 9-21.
5. Install reference air tube (C, Figure 9-20) in sensor housing (H).
Make sure that the open end of reference air tube extends into heater tube of O
2
cell
and heater strut assembly (P).
Install terminals insulator and cover
Complete the following steps to install the terminals insulator and cover in the OCX 8800.
1. Install insulator (I, Figure 9-20) over uppermost terminal blocks. Position one side of
insulator against terminal blocks and snap terminal marking plate (J) to mating
stand-off.
2. Position opposite side of insulator (I) and secure with related marking plate (J).
3. If removed, install cover gasket (M). Screw cover (A) onto sensor housing (H).
Tighten cover firmly.
4. Align locking clip (G) with gap between cover ribs.
5. Loosen screw (F) and slide locking clip (G) fully into gap between cover ribs.
Retighten screw (F).
Sensor housing leak test
Complete the following steps to test the OCX 8800 sensor housing for leaks.
1. Install 1/4 NPT cap on dilution air fitting. Install a 1/4 NPT cap on sample tube (C,
Figure 9-11) or plug 1/4 NPT sample inlet port.
Capped or plugged ports must be air tight.
2. If not in place, install exhaust tube (B, Figure 9-11) in exhaust port according to
instructions provided.
3. Connect a calibrated manometer to the CAL GAS inlet port.
4. Connect and apply clean instrument air at 45 psig (310 kPa gauge) to the
instrument air inlet fitting.
5. Observe the manometer reading.
Maintenance and service
Reference Manual 247
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