Emerson Rosemount OCX 8800 Reference Manual page 250

Maintenance and service
Procedure
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Apply pipe thread sealant (Loctite #567) to the exposed pipe threads of eductor
elbow (N, Figure 9-15).
Do not apply sealant to the first turn of the pipe threads.
Screw the sensor holder (J) onto the eductor elbow (N).
With wrenches on eductor elbow (N) and on flats of sensor holder (J), tighten the
sensor holder. Do not allow the eductor elbow to turn.
Tighten the sensor holder (J) to align outside flat with matchmark on sensor housing
flange, as shown in Figure 9-18.
OCX 8800