Oxymitter 4000

Instruction Manual

IB-106-340 Rev. 3.0 December 2003

(c)On systems equipped with abra- sive shield, remove dual dust seal gaskets.

(d)Use spanner wrenches from Probe Disassembly Kit, Table 11-1,to turn hub free from retainer.

(e)Put hub in vise. Break out old ce- ramic diffusion element with chisel along cement line. Use a 3/8 in.

(9.5 mm) pin punch and clean fillet from the cement port.

(f)Break out remaining ceramic diffu- sion element by tapping lightly around hub with hammer. Clean grooves with pointed tool if neces- sary.

(g)Replace ceramic diffusion element using the ceramic diffusion ele- ment replacement kit in Table

11-1.This consists of a diffusion element, cement, setscrews, anti- seize compound, and instructions.

(h)Test fit replacement ceramic diffu- sion element to be sure seat is clean.

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 ceramic only forces cement into pores. Also, do not get any cement onto the flame arrestor element.

(i)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 cotton swab is useful for this.) Clean any excess cement from hub with wa- ter.

(j)Allow filter to dry at room tem- perature overnight or 1 to 2 hours at 200°F (93°C).

(k)Wipe a heavy layer of anti-seize compound onto the threads and mating surfaces of the flame arre- stor, diffusion hub, and probe tube.

(l)Assemble flame arrestor and diffu- sion hub with two pin spanner wrenches. Torque to 10 ft-lbs (14 N·m). Secure with hub retaining setscrew.

(m)On systems equipped with abra- sive shield, install dust seal gas- kets with joints 180° apart.

(n)Reinstall vee deflector, orienting apex toward gas flow. Apply anti- seize compound to setscrews and tighten with hex wrench.

(o)Reinstall probe on stack flange.

Rosemount Analytical Inc. A Division of Emerson Process Management

Maintenance and Service 9-17