GE Analytical Instruments ©2006 8-6 DLM 14291 Rev. A
Figure 8-3: Setup for
Cleaning Bags.
and the final leg connected to the bag (Figure 8-
3). As outlined below, this setup allows zero air to
be drawn into the bag.
• Remove the frit restrictor from the NOA and
connect the Nafion drier directly to the NOA
sample inlet. With 3-way valve and zero air
filter connected to the NOA, turn the valve so
that OFF is positioned toward the Zero Air
Filter and allow the NOA to completely
evacuate the gas from the bag. Disconnect the
bag and repeat for the remaining bags.
• Connect the bag to a source of dry, low NO gas
and slowly fill the bag. It is not necessary to completely fill the bag.
• Reconnect the bag to the 3-way valve. Turn the valve so that OFF points
toward the zero air filter. Allow the NOA to completely evacuate the contents
of the bag.
• After the bag is evacuated, turn the 3-way valve so that OFF points toward the
sampling line connected to the NOA. This will allow gas from the zero air filter
to be drawn into the Mylar bag and bring the pressure inside the bag back to
atmospheric. Disconnect the bag, and seal the bag with the cap. Reposition the
3-way valve so that OFF points toward the Zero Air Filter. Repeat for remaining
bags. Store the bags in a clean, dry and secure location. Reinstall the
restrictor before using the NOA for gas analysis.
Bags cleaned by this procedure will remain low in NO for approximately 24 hours.
Collecting the Samples – Vital Capacity Bag Kit
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