Emerson Process Management IB106-340 Heater Strut Replacement, Heater Strut Assembly

Instruction Manual

IB-106-340 Rev. 2.4 April, 2001

Oxymitter 4000

6-7 HEATER STRUT REPLACEMENT

This paragraph covers heater strut replacement. Do not attempt to replace the heater strut until all other possibilities for poor performance have been considered. If heater strut replacement is needed, order a replacement heater strut. (Table 9-1).

Use heat resistant gloves and clothing when removing probe. Do not attempt to work on the probe until it has cooled to room temperature. The probe can be as hot as 800°F (427°C). This can cause severe burns.

NOTE

stack or duct. If removing an Oxymitter 4000/SPS 4000 assembly, follow the in- structions in paragraph 6-4b.1.

b.Remove entire electronics per paragraph 6-5a,steps 2 through 6.

NOTE

If the Oxymitter 4000 is equipped with an integrally mounted SPS 4000 and installed in corrosive conditions, stainless steel gas tubes are used in- stead of silicon or Teflon tubes.

c.Carefully remove the CAL and REF gas sili- con tubes by pulling them off the CAL and REF gas ports. Pull the silicon tubes off the CAL and REF gas lines.

If the Oxymitter 4000 has an integrally mounted SPS 4000, it is not necessary to remove the sequencer when re- placing the heater strut.

a.Follow the instructions in paragraph 6-4a.1to remove the Oxymitter 4000 from the

V-DEFLECTOR

CERAMIC SUPPORT ROD

d.Loosen, but do not remove, the three screws (30, Figure 6-1)on the strut in the finned housing. The spring tension should release and the strut moves up.

e.Grasp the wire loop and carefully slide the strut out of the probe tube (Figure 6-8).

WIRE

LOOP

CERAMIC

DIFFUSER CELL FLANGE

ASSEMBLY

HEATER

22220050

Figure 6-8. Heater Strut Assembly

6-12 Maintenance and Service Rosemount Analytical Inc. A Division of Emerson Process Management