Emerson Rosemount Oxymitter 4000 Reference Manual page 154

Rosemount Oxymitter 4000
154
CAUTION
Do not get cement on ceramic diffusion element except where it touches the hub. Any
cement on ceramic diffusion element blocks airflow through element. Wiping wet
cement off of the ceramic only forces cement into pores. Also do not get any cement
onto the flame arrestor element.
9. Thoroughly mix cement and insert tip of squeeze bottle into cement port.
Tilt bottle and squeeze while simultaneously turning ceramic diffusion
element into seat. Do not get any cement on upper part of ceramic
diffusion element. Ensure complete penetration of cement around 3
grooves in hub. Cement should extrude from opposite hole. Wipe excess
material back into holes and wipe top fillet of cement to form a uniform
fillet. (A Q-Tip is useful for this.) Clean any excess cement from hub with
water.
10. Allow filter to dry at room temperature overnight or 1 to 2 hours at 93° C
(200° F).
11. Wipe a heavy layer of anti-seize compound onto the threads and mating
surfaces of the flame arrestor, diffusion hub, and probe tube.
12. Assemble flame arrestor and diffusion hub with two pin spanner wrenches.
Torque to 14 N·m (10 ft-lbs). Secure with hub retaining setscrew.
13. On systems equipped with abrasive shield, install dust seal gaskets with
joints 180°apart.
14. Reinstall vee deflector, orienting apex toward gas flow. Apply anti-seize
compound to setscrews and tighten with hex wrench.
15. Reinstall probe on stack flange.
July 2018
Maintenance and Service