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Instruction Manual
IB-106-340CDR Original Issue
January, 2002
4-8 Maintenance and Service Rosemount Analytical Inc. A Division of Emerson Process Management
Hazardous Area Oxymitter DR
27540008
PORT
CEMENT
THREADED
PROBE FLANGE
SPANNER
WRENCH
M5-0.8 x 5 mm
LOCKING SET SCREW
(USE 2.5 mm HEX KEY)
CERAMIC
DIFFUSION
ELEMENT
M6-1 x 6 mm
SETSCREW
(USE 3 mm
HEX KEY)
CEMENT
FILLET
VEE
DEFLECTOR
FLAME
ARRESTER
HUB
Figure 4-5. Ceramic Diffusion Element
Replacement
3. On systems equipped with abrasive
shield, remove dual dust seal gaskets.
4. Use spanner wrenches from Probe
Disassembly Kit, Table 7-1, to turn hub
free from retainer.
5. Put hub in vise. Break out old ceramic
diffusion element with chisel along ce-
ment line. Use a 9.5 mm (3/8 in.) pin
punch and clean fillet from the cement
port.
6. Break out remaining ceramic diffusion
element by tapping lightly around hub
with hammer. Clean grooves with
pointed tool if necessary.
7. Replace ceramic diffusion element us-
ing the ceramic diffusion element re-
placement kit in Table 7-1. This
consists of a diffusion element, ce-
ment, setscrews, anti-seize compound,
and instructions.
8. Test fit replacement ceramic diffusion
element to be sure seat is clean.
Do not get cement on ceramic diffu-
sion element except where it touches
the hub. Any cement on ceramic diffu-
sion element blocks airflow through
element. Wiping wet cement off of ce-
ramic 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 simultane-
ously turning ceramic diffusion element
into seat. Do not get any cement on
upper part of ceramic diffusion ele-
ment. Ensure complete penetration of
cement around 3 grooves in hub. Ce-
ment 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 ce-
ment 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 com-
pound 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 com-
pound to setscrews and tighten with
hex wrench.
15. Reinstall probe on stack flange.