Emerson Process Management IB106-340 Replacement Procedure, Ceramic Diffusion Element Replacement

Oxymitter 4000

Instruction Manual

IB-106-340 Rev. 2.4 April, 2001

RETAINER

OPTIONAL CERAMIC

DIFFUSION ELEMENT

SETSCREW

HUB

CEMENTCEMENT

PORTFILLET

VEE

DEFLECTOR

22220029

Hex wrenches needed to remove setscrews and socket head screws in the following procedure are available as part of a Probe Disassembly Kit, Table 9-1.

b.Replacement Procedure

1.Follow the instructions in paragraph

6-4a to remove the Hazardous Area Oxymitter 4000 from the stack or duct.

2.Loosen setscrews, Figure 6-10,using hex wrench from Probe Disassembly Kit, Table 9-1,and remove vee deflec- tor. Inspect setscrews. If damaged, re- place with stainless setscrews coated with anti-seize compound.

Figure 6-10. Ceramic Diffusion Element

Replacement

6-9 CERAMIC DIFFUSION ELEMENT REPLACEMENT

NOTE

This refers to the ceramic diffusion element only.

a.General

The diffusion element protects the cell from particles in process gases. Normally, it does not need to be replaced because the vee deflector protects it from particulate erosion. In severe environments, the filter may be broken or subject to excessive erosion. Ex- amine the ceramic diffusion element when- ever removing the probe for any purpose. Replace if damaged.

Damage to the ceramic diffusion element may become apparent during calibration. Compare probe response with previous re- sponse. A broken diffusion element will cause a slower response to calibration gas.

3.On systems equipped with abrasive shield, remove dual dust seal gaskets.

4.Use spanner wrenches from Probe Disassembly Kit, Table 9-1,to turn hub free from retainer.

5.Put hub in vise. Break out old ceramic diffusion element with chisel along ce- ment line. Use a 3/8 in. (9.5 mm) pin

punch and clean fillet from the cement	6
port.

6.Break out remaining ceramic diffusion element by tapping lightly around hub with hammer. Clean grooves with pointed tool if necessary.

7.Replace ceramic diffusion element us- ing the ceramic diffusion element re- placement kit in Table 9-1.This consists of a diffusion element, ce- ment, setscrews, anti-seize compound, and instructions.

8.Test fit replacement ceramic diffusion element to be sure seat is clean.

Rosemount Analytical Inc. A Division of Emerson Process Management Maintenance and Service 6-15