Emerson Process Management OXYMITTER 4000 instruction manual Ceramic Diffuser Element Replacement

Instruction Manual

IB-106-340C Rev. 4.1 July 2004

Hazardous Area Oxymitter 4000

M5-0.8 x 5 mm

LOCKING SET SCREW (USE 2.5 mm HEX KEY)

THREADED	SPANNER
PROBE FLANGE	WRENCH

CERAMIC

DIFFUSION

ELEMENT

installed. Disconnect the orange cell wire at the probe electronics end of the strut by cutting the wire. Withdraw the cell with the wire still attached.

5.	Remove entire electronics per para-
	graph 9-4b,steps 2 and 3.
6.	If the contact and thermocouple

FLAME ARRESTER HUB

M6-1 x 6 mm

SETSCREW (USE 3 mm

HEX KEY)

assembly is damaged, replace the

assembly or the contact pad. Refer to

paragraph 9-4jto replace the contact

and thermocouple assembly. Instruc-

tions for replacing the contact pad are

in the cell replacement kit.

CEMENT

PORTCEMENT

FILLET

VEE

DEFLECTOR

27540008

Figure 9-10. Ceramic Diffuser Element

Replacement

3.Remove the locking set screw from the flame arrestor. Use spanner wrenches from the probe disassembly kit (Table 11-1)to turn the flame arrestor hub free from the probe flange. If equipped with the flame arrestor with ceramic diffuser, remove and discard the setscrews and remove the vee deflec- tor (Figure 9-10). Inspect the ceramic diffuser. If damaged, replace using paragraph 9-4i.

4.Loosen the four socket head cap screws from the cell and flange as- sembly. Remove the assembly and the corrugated seal. The cell flange has a notch that may be used to gently pry the flange away from the probe. Note that the contact pad inside of the probe will sometimes fuse to the oxygen sensing cell. If the cell is fused to the contact pad, push the cell assembly back into the probe (against spring pressure) and quickly twist the cell as- sembly. The cell and contact pad should separate. If the contact pad stays fused to the cell, a new con- tact/thermocouple assembly must be

7.	Remove and discard the corrugated
	seal. Clean the mating faces of the
	probe tube and cell. Remove burrs and
	raised surfaces with a block of wood
	and crocus cloth. Clean the threads on
	the probe flange and flame arrestor
	hub.
8.	Apply a light coating of anti-seize
	compound to both sides of the new
	corrugated seal.
9.	Assemble the cell and flange assembly
	and corrugated seal to the probe tube.
	Make sure the calibration tube lines up
	with the calibration gas passage in
	each component. Apply a small
	amount of anti-seize compound to the
	screw threads and use the screws to
	secure the assembly. Torque to 4 N·m
	(35 in-lbs).
10.	Apply anti-seize compound to the
	probe threads, flame arrestor hub, and
	setscrews. Reinstall the flame arrestor
	on the probe. Using pin spanner
	wrenches, torque to 14 N·m (10 ft-lbs).
	Secure the flame arrestor with the
	locking setscrew. Torque to 2.8 N·m
	(25 in-lbs). If applicable, reinstall the
	vee deflector, orienting apex toward
	gas flow. Secure with the setscrew and
	anti-seize compound. Torque to 2.8
	N·m (25 in-lbs).
11.	On systems equipped with an abrasive
	shield, install the dust seal gaskets,
	with joints 180° apart.

9-16 Maintenance and Service Rosemount Analytical Inc. A Division of Emerson Process Management