Emerson OXYMITTER 4000 - Manual (Page 48)

Instruction Manual
IB-106-340 Rev. 3.0
December 2003
1-12 Description and Specifications Rosemount Analytical Inc. A Division of Emerson Process Management
Oxymitter 4000
Figure 1-13. Hastelloy Cup-Type
Diffusion Assembly
3. Cup-Type Diffusion Assembly
The cup-type diffusion assembly,
Figure 1-13, is typically used in
high temperature applications where
frequent diffusion element plugging is
a problem. It is available with either a
5 or 40 micron, sintered, Hastelloy
element.
This element is also available with a
dust seal for use with an abrasive
shield.
b. Abrasive Shield Assembly
The abrasive shield assembly, Figure 1-14,
is a stainless-steel tube that surrounds the
probe assembly. The shield protects against
particle abrasion and condensations, pro-
vides a guide for ease of insertion, and acts
as a position support, especially for longer
probes. The abrasive shield assembly uses
a modified diffusor and vee deflector as-
sembly, fitted with dual dust seal packing.