Emerson ROSEMOUNT 3000 - Manual (Page 107)

Instruction Bulletin
Appendix A Rev. 3.9
May 2005
Rosemount Analytical Inc. A Division of Emerson Process Management Appendices A-7
World Class 3000
P0010
Figure A-8. Ceramic Diffusion/Dust Seal Assembly
These modified diffusion and vee deflector
assemblies are available in standard, Figure
A-8, and flame arrestor version, Figure A-9.
b. Ceramic Diffusion Assembly
The ceramic diffusion assembly, Figure
A-10, is the traditional design for the probe.
Used for over 25 years, the ceramic diffu-
sion assembly provides a greater filter sur-
face area for the probe.
P0011
Figure A-9. Flame Arrestor Diffusion/Dust
Seal Assembly
19280010
Figure A-10. Ceramic Diffusion Assembly
c. Flame Arrestor Diffusion Assembly
Where a high concentration of unburned
fuel is present in the exhaust gases, a flame
arrestor diffusion assembly, Figure A-9 and
Figure A-11 is recommended.
The flame arrestor diffusion assembly in-
cludes a set of baffles between the cell and
the stack gases. This keeps 1500°F (816°C)
cell temperatures from igniting unburned
fuel in the stack.
P0012
Figure A-11. Flame Arrestor Diffusion Assembly