Emerson 3000 World Class, Instruction Bulletin, A-2PROBE ASSEMBLY EXTERIOR, b.Probe Tube Assembly

World Class 3000

Instruction Bulletin

Appendix A Rev. 3.9 May 2005

A-2 PROBE ASSEMBLY EXTERIOR

Primary probe exterior components include a flange-mounted zirconium oxide cell, mounted on a tube assembly and protected by a snubber diffusion assembly.

a.Cell and Flange Assembly

The primary component in the cell and flange assembly, Figure A-3, is a yttria-stabilized zirconium oxide cell. It cre- ates an electrical signal when the oxygen level on one side is out of balance with the oxygen level on the other side. This signal is proportional to the difference in oxygen levels.

b.Probe Tube Assembly

Four screws secure the cell and flange as- sembly, Figure A-3, to the probe tube as- sembly. When in place, the cell is inside the tube.

The tube assembly includes a flange which mates with a stack-mounted flange (shown attached to the probe flange in Figure A-2). Studs on the stack flange make installation easy. There is also a tube to carry calibration gas from the probe junction box to the process side of the cell during calibration.

PROBE TUBE

CORRUGATED

SEAL

CELL AND

FLANGE

ASSEMBLY

21240007

Figure A-3. Cell and Tube Assemblies

c.Snubber Diffusion Assembly

The snubber diffusion assembly protects the cell from heavy particles and isolates the cell from changes in temperature. The snubber diffusion assembly threads onto the cell and flange assembly. Pin spanner wrenches (probe disassembly kit 3535B42G01) are applied to holes in the snubber diffusion element hub to remove or install the snubber diffusion assembly.

An optional ceramic diffusor element and vee deflector, shown in Figure A-4, is available. The ceramic diffusor assembly is also available in a flame arresting version to keep heat from the cell from igniting flue gases.

Systems that use an abrasive shield require a special snubber diffusion assembly with a hub that is grooved to accept two dust seal gaskets. This special diffusor is available in both snubber and ceramic versions. See Probe Options, section A-6.

DIFFUSION

ELEMENT

HUB

PIN

WRENCH VEE DEFLECTOR

21240024

Figure A-4. Optional Ceramic Diffusor and Vee

Deflector Assembly

Rosemount Analytical Inc. A Division of Emerson Process Management Appendices A-3