Ceramic Diffusion Element Replacement

Instruction Manual

IB-106-340 Rev. 3.0 December 2003

Oxymitter 4000

11.Install the entire electronics per para- graph 9-4c,steps 7 through 13.

12.Apply anti-seize compound to the threads of the cell assembly, hub, and setscrews. Reinstall the hub on the cell assembly. Using pin spanner wrenches, torque to 10 ft-lbs (14 N·m). If applicable, reinstall the vee deflector, orienting apex toward gas flow. Secure with the setscrews and anti-seize com- pound. Torque to 25 in-lbs (2.8 N·m).

13.On systems equipped with an abrasive shield, install the dust seal gaskets, with joints 180° apart.

14.Reinstall the probe and gasket on the stack flange.

15.Follow the instructions in paragraph

9-4a.2to install the Oxymitter 4000 into the stack or duct. If installing an Oxy- mitter 4000/SPS 4000 assembly, follow the instructions in paragraph 9-4b.2.If there is an abrasive shield in the stack, make sure the dust seal gaskets are in place as they enter the 15° reducing cone.

16.Turn on power and monitor thermocou- ple output. It should stabilize at 29.3+0.2 mV. Set reference air flow at 2 scfh (56.6 l/hr). After the Oxymitter 4000 stabilizes, calibrate the unit. If new components have been installed, repeat calibration after 24 hours of operation.

j.Ceramic Diffusion Element Replacement

NOTE

This refers to the ceramic diffusion element only.

1.General. The diffusion element pro- tects 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 ero- sion. Examine the ceramic diffusion element whenever removing the probe for any purpose. Replace if damaged.

Damage to the ceramic diffusion ele- ment may become apparent during calibration. Compare probe response with previous response. A broken diffu- sion element will cause a slower re- sponse to calibration gas. Hex wrenches needed to remove setscrews and socket head screws in the follow- ing procedure are available as part of a Probe Disassembly Kit, Table 11-1.

2.Replacement Procedure.

(a)Follow the instructions in para- graph 0 to remove the Oxymitter 4000 from the stack or duct.

(b)Loosen setscrews, Figure 9-11,using hex wrench from Probe Dis- assembly Kit, Table 11-1,and re- move vee deflector. Inspect setscrews. If damaged, replace with stainless setscrews coated with anti-seize compound.

RETAINER

OPTIONAL CERAMIC

DIFFUSION ELEMENT

SETSCREW

HUB

CEMENTCEMENT

PORTFILLET

VEE

DEFLECTOR

22220029

Figure 9-11. Ceramic Diffusion Element

Replacement

9-16 Maintenance and Service

Rosemount Analytical Inc. A Division of Emerson Process Management

4000 specifications

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