Super Systems Gold Probe - Manual (Page 6)

5
SSi Gold Probe Manual Rev C
INSTALLATION
If your new probe is to be installed in an existing
probe entry, be advised that your warranty
requires that the probe should extend no more
than 4" (101mm) into the furnace chamber. This
is because, at operating temperatures, the
sheath can sag enough to cause breakage of the
zirconia-sensing element.
For new installations, an entry fitting must be
provided at the furnace wall to permit the probe
to extend from 2" to 4" (51mm to 101mm) into
the furnace chamber. Listed here are several
conditions that should be considered when
choosing a location for the entry fitting. Most of
these conditions allow for some compromise,
and represent, at best, recommendations.
A variety of fittings have been used to provide the
1" (25.4mm) NPT entry. The simplest is the 1
1/2" (38mm) coupling, as shown in Fig. 4.
The furnace is prepared by drilling a 1 1/2"
(38mm) diameter hole through the wall and the
insulation. The hole
must be at right angles to
the wall to avoid interference with probe
insertion. The fitting is then welded or screwed
to the wall to provide a gas-tight entry.
Your Gold Probe™ has been shipped with an o-
ring compression fitting which allows you to
adjust the insertion. Manual tightening of the cap
is adequate for side mounting. A wrench should
be used for vertical mounting to assure probe
will not move. When installing in a hot furnace,
insert the first four inches directly, then at a rate
of 2" (51mm) per minute in order to avoid
thermal shock fracture.
NOTE:
Your Gold Probe™ has been thoroughly
tested in our controlled atmosphere
furnace. Therefore, the sheath shows
evidence of thermal discoloration.
ENTRY FITTING LOCATION
 In top third of work zone......
 Close to control thermocouple......
 Distant from radiant tubes......
 Away from carrier gas entry......
 Clear of work baskets......
WARNING
Zirconia is thermal shock sensitive.
Insert into hot furnace no faster than 2"
(51mm) per minute (after first 4 inches
or 101 millimeters).