User`s guide

Routine Maintenance
280
2. Using the cold trap packing tool (P/N L427-1203),
remove the old packing. Insert the tool into the cold trap
and gently push out the packing and glass wool.
3. To pack a narrow bore, low-flow cold trap tube, first
place a glass filter disk into the empty trap tube. The low
flow trap is standard on the TD and ATD.
Figure 82 Packing the Low Flow Cold Trap
4. Place the cold trap tube upright on a bench with the
unplugged end at the top. It may be helpful to support
the tube in a narrow neck beaker or flask.
5. Insert a small funnel into the open end of the tube or use
a very narrow spatula.
6. To pack the trap tube with a single adsorbent material,
use preconditioned packing to fill the tube a length of
approximately 20 mm. Gently tap the tube frequently to
settle the packing.
NOTE: Do not use force or compress the packing as you will
damage the packing material.
If more than one adsorbent is used, add the weaker
adsorbent material first. The amount you add will be
determined by your application.
While introducing the required amount of the second
adsorbent into the tube, tap the tube gently and fre-
quently so that the packing settles. Be careful that the
adsorbents do not mix but remain in separate layers. A
CAUTION
Ensure the glass wool plug is secure. If the plug is loose the
packing could move to a cooler part of the tube, resulting in
peak broadening or complete sample loss.
Packing Limit Mark
Strong Adsorbent
Weak Sorbent
Glass
Wool Plug
Filter Disks
Spring
DesorbAdsorb