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Instruction Manual

Appendix AX Rev. 2.1

February 1998

Rosemount Analytical Inc. A Division of Emerson Process Management Appendices A-13

World Class 3000

l. Reinstall probe and gasket on stack flange.

If there is an abrasive shield in the stack,

make sure dust seal gaskets are in place as

they enter 15° reducing cone.

m. Consult Safety Data Sheet 1M03226 then

turn power on to electronics and monitor

thermocouple output. It should stabilize at

29.3 mV ±0.2 mV. Set reference air flow at

56.6 L/hr (2 scfh). After probe stabilizes,

calibrate probe per Instruction Bulletin ap-

plicable to your electronics package. If new

components have been installed, repeat

calibration after 24 hours of operation.

A-12 CERAMIC DIFFUSION ELEMENT

REPLACEMENT

NOTE

This refers to ceramic diffuser element

only.

a. General

The diffusion element protects the cell from

particles in process gases. It does not nor-

mally 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.

Hex wrenches needed to remove setscrews

and socket head screws in the following

procedure are available as part of a Probe

Disassembly Kit, Table A-3.

Wear heat resistant gloves and cloth-

ing to remove probe from stack.

Normal operating temperatures of

diffuser and vee deflector are

approximately 316° to 427°C (600° to

800°F). They can cause severe burns.

Before carrying out this procedure,

consult Safety Data Sheet 1M03226.

Do not remove cell unless it is certain

that replacement is necessary. Cell

cannot be removed for inspection

without damaging it.

b. Replacement Procedure

1. Follow the power down procedure out-

lined in Safety Data Sheet 1M03226

and the official "Codes of Practice" for

your country of installation. Disconnect

cable conductors and remove cable,

Figure A-10. Shut off and disconnect

reference gas and calibration gas sup-

plies from probe junction box. Wearing

heat resistant gloves and clothing,

carefully remove probe assembly from

stack.

2. Loosen setscrews, Figure A-13, using

hex wrench from Probe Disassembly

Kit, Table A-3 and remove vee deflec-

tor. Inspect setscrews. If damaged, re-

place with stainless setscrews coated

with anti-seize compound.

3. On systems equipped with abrasive

shield, remove dual dust seal gaskets.

AX

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