Emerson Process Management OXYMITTER 4000 instruction manual Contact and Thermocouple Assembly

Instruction Manual

IB-106-340C Rev. 4.1 July 2004

Hazardous Area Oxymitter 4000

diffusion element into seat. Do not get any cement on upper part of ceramic diffusion element. Ensure complete penetration of cement around 3 grooves in hub. Cement should extrude from opposite hole. Wipe excess material back into holes and wipe top fillet of cement to form a uniform fillet. (A Q-Tip is useful for this.) Clean any excess cement from hub with water.

(j)	Allow filter to dry at room tem-
	perature overnight or 1 to 2 hours
	at 93°C (200°F).
(k)	Wipe a heavy layer of anti-seize
	compound onto the threads and
	mating surfaces of the flame arre-
	stor, diffusion hub, and probe tube.
(l)	Assemble flame arrestor and diffu-
	sion hub with two pin spanner
	wrenches. Torque to 14 N·m (10 ft-
	lbs). Secure with hub retaining
	setscrew.
(m) On systems equipped with abra-
	sive shield, install dust seal gas-
	kets with joints 180° apart.
(n)	Reinstall vee deflector, orienting
	apex toward gas flow. Apply anti-
	seize compound to setscrews and
	tighten with hex wrench.
(o)	Reinstall probe on stack flange.
j. Contact and Thermocouple Assembly
Replacement
See Figure 9-11.

4.Squeeze the tabs on the spring clips and pull the contact and thermocouple assembly out of the heater strut. Retain the spring clips and spring; replace if damaged.

5.While very carefully handling the new contact and thermocouple assembly, lay the old assembly next to the new one. Transfer the pencil marks to the new rod. Throw away the old contact and thermocouple assembly.

6.Carefully guide the new contact and thermocouple assembly through the spring, spring clips (held open by squeezing the tabs), tube supports, and heater support of the heater strut assembly until the spring clip reaches the pencil mark.

7.Install the cell per the instructions in paragraph 9-4h,steps 7 through 12.

8.Slide the heater strut assembly into the probe per the instructions in paragraph 9-4g,steps 9 through 14.

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

10.Follow instructions in paragraph 2-1bto install the Hazardous Area Oxymitter 4000 into the stack or duct. 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.

STRUT

1.	Remove the cell per paragraph 9-4h,
	steps 1 through 5.
2.	Remove the heater strut assembly per
	paragraph 9-4g,steps 3 through 8.
3.	Use a pencil to mark locations of the
	spring clips on the ceramic rod of the
	contact and thermocouple assembly.

TUBE

SUPPORTS

CONTACT AND

THERMOCOUPLE

ASSEMBLY

SPRING

CLIP

SPRING26310022

Figure 9-11. Contact and Thermocouple Assembly

Replacement

9-18 Maintenance and Service Rosemount Analytical Inc. A Division of Emerson Process Management