Instruction Manual
Appendix AX Rev. 2.1
February 1998
Rosemount Analytical Inc. A Division of Emerson Process Management Appendices A-3
World Class 3000
PIN
WRENCH
SNUBBER
DIFFUSOR
19780006
Figure A-4. Flame Arrestor Diffuser Assembly
d. Cell – General
The components which make up the cell are
machined to close tolerances and assem-
bled with care to provide accurate oxygen
measurements. Any replacement requires
attention to detail and care in assembly to
provide good results.
Failure to follow the instructions in
this manual could cause danger to
personnel and equipment. Read and
follow instructions in this manual
carefully.
The oxygen probe includes an inner elec-
trode for the cell assembly. It consists of a
platinum pad and a platinum/inconel com-
posite wire which produces the cell constant
offset voltage described in the Nernst equa-
tion.
With this pad and wire, the constant will be
between -10 to +15 mV. The cell constant is
noted in the calibration data sheet supplied
with each probe.
Every probe should be calibrated and
checked after repair or replacement of cell,
pad and wire, heater, or thermocouple, or
after disassembly of the probe.
HEATER
REFERENCE
GAS TUBE
V-STRUT
P00005A
CERAMIC
SUPPORT TUBE
Figure A-5. Inner Probe Assembly
A-3 INNER PROBE ASSEMBLY
The inner probe assembly, Figure A-5, consists
of six main parts:
a. Ceramic support rod with four holes running
through the length. The holes serve as in-
sulated paths for the cell signal wire and
thermocouple wires.
b. A heater that is helically wrapped on a
quartz support cylinder and insulated.
c. A chromel-alumel thermocouple which acts
as the sensing element for the temperature
controller. (Not visible in Figure A-4; located
within ceramic support rod.)
d. A platinum screen pad which forms electri-
cal contact with the inner electrode of the
electrochemical cell. (Not visible in Figure
A-5; located at end of ceramic support rod.)
The pad is attached to an inconel wire
which carries the signal to the terminal strip.
e. A V-strut assembly to give support to the
inner probe assembly.
f. A tube to carry reference gas to the cell.
Turn to Maintenance and Service for repair pro-
cedures for probe components.
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