Revision 14
52 August 02, 2019
Figure 3-23: Location of Cap for Furnace Leak Check
c) Monitor the flow on the hydrogen and sample rotameters on the sample conditioning
system. If there is a good seal in the furnace, the flow on both rotameters should drop to
zero within 1 minute.
d) If the flow does not drop to zero, use liquid leak detector (e.g. Snoop) to check all
external fittings for leaks. If there are none, remove the end caps from the furnace
enclosure and ensure that all the fittings on the four ultra-torr elbows inside the
enclosure, especially the two on the reaction tube itself, are as tight as possible. Again,
be careful not to break the tube while tightening the fittings.
e) Once all leaks have been fixed, replace the end caps, remove the cap, and reattach the
sample line to the top of the flame arrestor. Ensure that this fitting is tight.
f) Go ahead and change the Furnace Pulse Width back to the correct duty cycle for the
appropriate input voltage of the analyzer.
3.7.4 Connecting the Eductor
The eductor (see Section 2.7.4) is normally driven by the sample stream through the sample
regulator set at 15 psig but if the H
2
S concentration expected is above 25 ppm, instrument air
should be connected to the 1/8” tube on the eductor.
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