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IPN 074-397-P1G
HAPSITE Smart Operating Manual
2.10.2 Attaching a Bag Sample
When situations call for collecting samples to be run later, various sampling bags
can be used.
1 Before attaching a Tedlar® Bag to the Probe, refer to section 2.10.1, Probe Nut
Assembly, on page 2-37 to ensure proper ferrule orientation in the probe nut.
2 Prepare the Tedlar Bag sample. Avoid filling bag more than 80% full. Be sure
the valve is closed on the Tedlar bag.
3 Loosen the nut on the probe by turning the nut counter-clockwise up to two
complete revolutions.
4 Guide the cylindrical stem of the bag valve assembly into the opening of the
probe nut. Firmly push the stem into the probe nut. Two cylinder "clicks" are
usually felt before the bag is properly seated into the probe nut.
5 Finger tighten the probe nut by turning the nut clockwise.
6 Open the Tedlar Bag by turning the valve one complete counter-clockwise
revolution.
7 Proceed with the desired method. See Chapter 6, Methods.
2.10.3 VX-G Conversion Tube
This procedure describes the steps required to prepare the HAPSITE to sample for
VX or R-33 using the VX-G conversion tube. To detect VX or R-33, you must insert
the VX-G conversion tube following the guidelines below.
The process of detecting VX or R-33 on the HAPSITE requires the conversion of
VX or R-33 (high boiling point chemicals) to the G analog. The VX or R-33 molecule
is broken at the sulfur bond when it comes in contact with a silver fluoride pad. The
result is the formation of a volatile chemical ethyl methylphosphonofluoridate in the
case of VX, or isobutyl methylphosphonofluoridate in the case of R-33. These
compounds are detected by the HAPSITE as VX-G or R-33-G.
NOTE: Theoretically, other G agents can be detected with the VX conversion pad
in place. However, if other G agents are suspected, the sample should be
also run without the conversion tube in place.
Sulfur Mustard cannot be detected with the conversion
tube in place.
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