INFICON HAPSITE Smart Plus Chemical Identification System - Manual (Page 575)

B - 5
IP
N 07
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47
2-
P1
C
HAPSITE Smart Plus Operating Manual
contents. The bag should not be filled to the point where the bag appears like a firm
"air pillow", as the bag would then be at above atmospheric pressure, and could
not be sampled accurately by the HAPSITE. In addition, this would lead to eventual
leakage along the bag seams, destroying the integrity. The use of straight through
on-off valves on the Tedlar bags (such as on 231 -XX series bags by SKC
5
, Inc.)
should minimize any flow restriction variation in gas delivery to the HAPSITE and
are preferred.
Clean Tedlar bags to be filled with a certified gas mix should be filled once with the
gas mix and allowed to stand several minutes for preconditioning, then evacuated
with a transfer line and a diaphragm vacuum pump and refilled again with the mix.
Fittings on the Tedlar bags are typically 3/16" diameter; the inlet systems for the
HAPSITE are 1/8" diameter. Connection of the Hand Control Unit (or the Heated
Line) to the Tedlar bag can be made with a stainless steel Swagelok type adapter,
3/16" to 1/8". The recommended parts for this adapter include:
3/16" to 1/8" Reducer . . . . . . . . . . . (Swagelok part# SS-300-R-2)
3/16" Teflon Ferrule Set . . . . . . . . . . (Swagelok part# T-300-Set)
1/8" Nut . . . . . . . . . . . . . . . . . . . . . . (Swagelok part# S-S-202-1)
1/8" Ferrule Set . . . . . . . . . . . . . . . . (Swagelok part# SS-200-Set)
The 3/16" O.D. tube on the Tedlar bag valve will slip into and out of the 3/16" nut
on the adapter, which can be easily finger tightened to seal leak free on the Teflon
ferrule set. Care should be taken to not completely unscrew the 3/16" nut from the
adapter each time a Tedlar bag is removed, to prevent dropped and lost nuts and
ferrules. The 1/8" end of the adapter is a swaged connection to the 1/8" male
Swagelok fitting on the end of the HAPSITE Hand Control Unit, so wrenches will
be required to make a leak free connection here.
The Tedlar bag valve should be open only during the HAPSITE sample taking cycle
to save gas usage.
5.SKC: (800) 752-8472