User`s guide

Routine Maintenance
284
13. Connect the supply of purge air and carrier gas and
begin purging the cold trap enclosure. Wait for 30
minutes before powering up the instrument.
14. You should run a trap conditioning cycle to remove any
volatile impurities from the filter disks.
Packing Sample Tubes
There are three types of sample tubes. They are listed in the
following table.
Table 20 Sample Tubes
The first 1 cm and last 1 cm of the tube are not touched directly by
the heater; they are heated indirectly. Do not put sample, packing
material, glass wool or gauze in those areas.
To prevent particles from being ejected into the ATD/TD plumbing,
both the fixed seal and mobile seal assemblies contain a filter disk.
Replace them often when necessary. See Changing the O-Rings in
the Fixed and Mobile Seals on page 249.
Take care to prevent adsorbent or sample material from moving
from the sample tubes into the gas lines of the system. For this
reason, we recommend that you do not use adsorbents with a mesh
size finer than 60-80, and routinely ensure that the gauze disks that
retain the packing are correctly in place.
Tube Type P/N Quantity
Stainless Steel L427-0123 pkg of 10
Glass L427-0124 pkg of 10
Glass-lined Stainless Steel L427-0125 pkg of 10