User`s guide

Routine Maintenance
275
NOTE: If there is any sign of ice or water at the bottom of the trap
enclosure, there is a problem with the dry air supply, which
is used to purge the cold trap box of water. See Gas Supply
Specifications on page 70 for dry air specifications.
Replacing the Cold Trap
Installing the cold trap is slightly more difficult than removing it.
The cold trap must be correctly aligned or it will crack when you
tighten the nut on the inlet side of the trap. You will only know that
the trap is aligned correctly if it slides smoothly through the fittings
to the heated valve. You cannot see that the trap is aligned, you can
only feel it slide smoothly into the heated valve.
Always replace the filter disks (at the inlet and outlet fitting). Access
is difficult, an angled dental mirror may help to confirm correct
installation. Also make certain that the graphite or PTFE ferrules are
replaced with new ones and the nuts are reinstalled correctly.
To replace this trap refer to the following procedure:
1. Install the new trap by sliding it to the left until you
encounter resistance. Reattach the brass ring and o-ring.
Make sure that the flat side of the brass ring is pointing
towards the trap.
Figure 80 Brass Ring Flat Side
CAUTION
This tube is made from glass. The trap could fracture if it is
bent or stressed.
CAUTION
Never use force to install the trap as you will damage the
quartz tube.