6-10 | Thermox WDG-1200/1210 Insitu Probes
Heater/thermocouple replacement
removing Heater (See Figure 6-3)
1. Remove the inner probe assembly as described in the previous section,
Inner
Tube Assembly Removal
.
2. Remove the cell as described in the
Cell Replacement
section above under
the
Removing the Cell
subsection.
3. Slide the heater and cell leads out of the inner probe assembly.
4. Mark the location of the spiders on the heater assembly using a permanent
marker (they will need to be spaced the same way when you reattach them to
the inner probe assembly). Then loosen the set screws (1/16” socket head) on
all the spiders.
5. Remove the cell clips from heater, then remove the heater from the spiders.
6. Before discarding the old heater, transfer the marks from the old heater to
the new heater. Note that the alignment spider, identified by four set screws
vs. only one set screw for other spiders, must be placed 10” from the tip of
the plasma-sprayed end (heater end). The other spiders are placed every 12”
thereafter.
replacing Heater
1. Slide the new heater through the spiders, taking care to avoid touching the
white coating on the heater against the spider.
2. Position the spiders on the heater using the marks made in Step 6 above. For
the alignment spider, tighten the 1/16” set screws on the alignment spider
using a 1/16” allen head wrench so the heater wall doesn’t touch the spider
wall. This is not required for the other spiders; simply tighten the one set
screw for each of these spiders.
3. Slide the heater, cell clips, and cell leads into the inner probe assembly so the
end of the heater is 2” inside the end of the inner probe assembly (wrench
flats end of probe assembly).
4. Follow the steps in the
Replacing the New Cell
section in the
Cell Replace-
ment
section to put the cell back together. Be sure that the heater assembly is
centered in the first spider (4 set screws).
5. Reinsert the inner probe assembly by reversing the steps described in the
In-
ner Tube Assembly Removal
section earlier in this chapter.
Summary of Contents for Thermox WDG-1200 Insitu
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