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HAPSITE ER Operating Manual
3 Tighten the Swagelok nut finger tight. Pull gently on the conversion tube, to
ensure it is held firmly in place. (See Figure 3-64.)
Figure 3-64 Tightening the Swagelok Nut
NOTE: The VX-G conversion tube must be replaced after eight hours of
exposure to light and air, or after exposure to VX or RVX.
The silver fluoride pads in the tube are light sensitive and are degraded
by exposure to nitrogen containing compounds in air. The tubes must
be stored in their original sealed container to maximize their shelf life.
To maintain the maximum shelf life of one year from
manufacture date, store tubes sealed in their original
packaging when not in use.
3.3.10.2 Thermal Desorption Tube Sampling
1 Fasten a 6 mm VX-conversion tube to the inlet end using a short segment of
Tygon tubing, as shown in Figure 3-65.
2 Connect the thermal desorption tube in the proper orientation (flow direction
arrow on the tube should point towards the sampling pump (see Figure 3-65))
to a small portable sampling pump. The air sample will be drawn through the
conversion tube and onto the TD tube.
Suggested sampling flow rates are 20-100 mL/min. Suggested sample volumes
are 100-1000 mL. Larger volumes should be tested for breakthrough, see Thermal
Desorber Sampling in the Operating Manual for details.
After sampling is complete, remove the VX conversion tube from the TD tube.
Continue analysis of TD tube as described in Section 4.2 of the TDSS Operating
Manual.
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