Emerson OXYMITTER 4000 - Manual (Page 140)

Instruction Manual
IB-106-340 Rev. 3.0
December 2003
9-12 Maintenance and Service Rosemount Analytical Inc. A Division of Emerson Process Management
Oxymitter 4000
6. Turn the electronic assembly over so
that you are looking at the bottom of
the power supply printed circuit board.
Gently depress the two white posts one
at a time. Carefully separate the power
supply board (20) from the micropro-
cessor board (17).
7. Remove the fuse (19) and replace it
with a new one (Figure 9-7).
8. Align the white posts with the post
holes on the power supply board and
the pin connector on the power supply
board with the connector port on the
back of the microprocessor board.
Gently push the boards together until
the white posts snap in place. Ensure
the assembly is secure by gently trying
to separate the boards.
9. Reconnect connector J8 to the power
supply board. Make sure the connector
is secure.
10. Holding the J1 connector leads, slide
the electronic assembly the rest of the
way into the housing. Align the elec-
tronic assembly so that it fits flush on
the pins. To ensure that it is flush,
gently try to rotate the electronics. If
the electronics rotates, repeat the
alignment.
11. Reconnect the J1 connector to the mi-
croprocessor board. Ensure the con-
nector is secure and tighten the three
captive screws on the microprocessor
board (top board).
12. Replace the housing cover and ensure
that it is tight.
g. Entire Probe Replacement (Excluding
Probe Head)
Do not attempt to replace the probe until all
other possibilities for poor performance
have been considered. If probe replacement
is needed, see Table 11-1 for part numbers.
1. Follow the instructions in paragraph
9-4a.1 to remove the Oxymitter 4000
from the stack or duct. If removing an
Oxymitter 4000 with an integrally
mounted SPS 4000, follow the instruc-
tions in paragraph 9-4b.1.
2. Separate the probe and the probe
head per paragraph 9-4c, steps 2
through 6.
3. Reinstall the probe head on the new
probe per paragraph 9-4c, steps 7
through 13.
h. Heater Strut Replacement
This paragraph covers heater strut re-
placement. Do not attempt to replace the
heater strut until all other possibilities for
poor performance have been considered. If
heater strut replacement is needed, order a
replacement heater strut. (Table 11-1). Re-
fer to Figure 9-3 or Figure 9-4 to view the
component parts of the Oxymitter 4000.
Use heat resistant gloves and clothing
when removing probe. Do not attempt
to work on the probe until it has
cooled to room temperature. The
probe can be as hot as 800°F (427°C).
This can cause severe burns.
NOTE
If the Oxymitter 4000 has an integrally
mounted SPS 4000, it is not necessary
to remove the sequencer when re-
placing the heater strut.
1. Follow the instructions in paragraph
9-4a.1 to remove the Oxymitter 4000
from the stack or duct. If removing an
Oxymitter 4000/SPS 4000 assembly,
follow the instructions in paragraph
9-4b.1.
2. For a unit with integral electronics, dis-
connect electronics per paragraph
9-4c, steps 2 through 5.
3. For a unit with remote electronics, re-
move cover (11, Figure 9-4) from
housing (21), and disconnect signal