User`s guide

Routine Maintenance
279
Repacking the Cold Trap
NOTE: We highly recommend that you buy pre-packed traps unless
you have experience in packing traps.
There are 2 types of prepacked cold traps tubes. They are listed in
the following table.
Table 19 Prepacked Cold Traps
If you choose to repack the trap yourself, use care when handling the
packing material as you do not want to damage it. Observe all
precautions as listed on the material safety data sheet.
You do not want to pack the trap too loosely or the trap may fail
under pressure. If you pack the trap too tightly, you risk damaging
the packing material or restricting the flow of carrier gas through the
trap. This will adversely affect subsequent thermal desorption and
pumped-air monitoring procedures.
You should use pre-conditioned packing material. Refer to the
manufacturer’s instructions to condition the packing before using it
to fill the trap. Handle the packing material carefully during
conditioning and packing. Do not crush it or you will create fine
particles which may get into the system.
To pack the cold trap:
1. Remove the cold trap, as described in Removing the
Cold Trap on page 270.
Tube Type P/N Application
Packed Cold Trap,
Tenax
MO41-3535
L427-5108
Air Monitoring Trap
MO41-3628
Low-flow cold trap
suitable for ozone
precursor and air
toxics monitoring.