Emerson Rosemount OCX 8800 Reference Manual page 248

Maintenance and service
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Install and tighten the eductor (G) in the eductor holder (O).
Install and tighten the elbow (N) on the eductor (G).
The male port of the elbow must point up and be in line with the long axis of
eductor.
Apply anti-seize component to the external pipe threads of eductor holder (O).
Install and tighten eductor holder (O) in sensor housing (P). Align eductor with
matchmark, as shown in
Figure 9-16: Eductor alignment matchmarks
A. Eductor flat
B. Straight edge
C. Matchmark
Figure 9-16.
OCX 8800