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HAPSITE ER Operating Manual
11 Finger-tighten the nut by turning the nut clockwise. (See Figure 3-61.)
Figure 3-61 Finger-Tighten the Nut
3.3.10 VX/R-33 Conversion Tube
This procedure describes how to prepare HAPSITE to sample VX or RVX using the
VX-G conversion tubes (part numbers 930-4292-G1 and 930-4293-G1).
To detect VX or RVX, the VX-G conversion tube must be inserted into the probe
head or thermal desorption tube.
The process of detecting VX or RVX with HAPSITE requires the conversion of VX
or RVX (high boiling point chemicals) to what is referred to as the G analog. The
VX or RVX molecule is broken at the sulfur bond when it comes into 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 RVX. These compounds are
chromatographed and detected by HAPSITE as VX-G or RVX-G.
NOTE: G agents can be detected with the VX conversion pad in place. However,
if other G agents are suspected, it would be best to also run the sample
without the conversion tube in place.
NOTE: Sulfur mustard cannot be detected with the conversion tube in place.
3.3.10.1 Air Probe Sampling
The HAPSITE probe has a 3/16 in. Swagelok
®
nut installed at the end of the probe.
Inside this nut is a ferrule. The ferrule consists of two pieces, a front and back
ferrule. These must be in place and in the proper orientation. See Figure 3-62 for
proper orientation.
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