Revision 14
156 August 02, 2019
7.6 Replacing the Quartz Tube in the Total Sulfur System
To replace the quartz tube:
a) Change the Furnace Pulse Width % to 1 % (Furnace field of the Global tab of the GUI.
b) Let the furnace cool down for at least 1 hour.
It is essential that the power be turned off to the analyzer before carrying
out either of these procedures. The furnace enclosure must be allowed to
cool for at least 45 minutes prior to initiating these procedures. Do NOT
remove the end caps of the furnace enclosure until the furnace is cool –
attempting to remove the end caps while the furnace is still hot could result
in an explosion if even a small amount of hydrogen has leaked into the
furnace!
Figure 7-5 shows a numbered photo of the exterior and interior of the total sulfur furnace, for
ease of identifying all the parts discussed in these procedures. The total sulfur furnace is
housed inside an explosion proof enclosure (1). There are two screw on end caps (2,3) that
screw onto large threads (10) at each end of the enclosure. A conduit (6) carries the power
wiring (11,12) and the temperature sensor wiring (not visible) into the enclosure. The sample
flows through flame arrestors (4,5) on the way into and out of the furnace. The reaction takes
place in a quartz reaction tube (8) inside the actual total sulfur furnace, which is housed in a
smaller aluminum enclosure (7). The sample lines are attached to the quartz tube by means
of ultra-torr elbows (9) that have finger-tightened nuts to create an adequate seal.
Figure 7-5: Total Sulfur Furnace Enclosure - Exterior (L) and Interior (R)
c) Turn off the hydrogen and sample flow at the rotameters on the sample conditioning
system.
d) Unscrew the nuts all the way on the reaction tube sides of the two ultra-torr elbows inside
the furnace assembly.
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