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Chapter:
Topic:
PURGEANDTRAP CONCENTRATOR
HARDWAREORIENTATION
Column oven
The Purge and Trap option is
mounted on theGC chassis in
a special dueled heated valve
oven just to the left
of
the
column oven
To change traps this cover
platemust
be
removed by
loosening the four brass
thumbscrews located at the
comers.
Traps are located between
ducts so that the ends of the
traps are enclosedwithin the
heated duct area while the
body of the traps are
suspended in the trap heaters
between the ducts. A
protective grill keeps fingers
and tools out of the trap heat
zone while allowing hot air to
escape.
A vent tube is located at the
back of the P&T valve oven.
The sparge gas exits from this
vent tube after passing through
the traps.
10 port electrically operated Valco valve mounted in the
heated valve oven is the heart of the purge and trap
hardware. The valve oven is typically set to 150
degrees Csowater will not condense.
Ducts enclose ends of traps within heated valve oven to prevent cold spots.
