Chapter:
Topic:
PURGE AND TRAP
Connecting The Free-Standing Hl-Station Purge and Trap Autosampler
FRONT VIEWOF H)·STATION PURGE-AND-TRAP AUTOSAMPLER
The physical appearance and configuration
of the to-station purge-and-trap is subject
to
change without notice due
to
continuing
improvements
in
hardware
design
REV. 11-03-96
The SRI lo-station purge andtrap autosampler
option for the
SRI
gas
chromatograph is a free-standing
purge and trap system that may he connected to any
purge-and-trap concentrator-equipped brand of gas
chromatograph
in
amatter ofminutes. The system
permits
auser
to
load and sparge any combination of up
to 10 sample and blank test tuhes and select sampling
stations bymeans of a cabled
digital
remote control.
Control of the injection valve
is
performed by another
cabled remote control (athree-wire cable is also provided
Sparge
gas
inlet
to
permit
relay .switching under
/
data
systemor
integrator
"=/Fb
control). The systemincludes a
heated valveoven
that
prevents
any condensation of analyte
in
the valves oradjacent
plumbing. The sparging heads
are also
maintained
warm
to
prevent adhesion of sample on
the interior surfaces.
A
transfer line
must
be
used
in
order
to
move the
sample analytes from the valve oven
to
the injection
port
or sampling
valve of the host chromatograph. A
built-in heating element prevents
sample
analyte
from condensing
in
the line, actually 36" of virtually
indestructible, fused-silica lined
stainless steel capillary tubing.
Connections areasfollows:
connect
the sparge gas supply to sparge gas
inlet tubing. 5psi of helium
is
preferred. Connect the heated
--- transfer line
to
the sparge head
port of
the
purge-and-trap system.
Momentary
connection
of green
and
red
wire of three-wire cable rotates
the sampling valve to LOAD.
Joining the green and black wires
rotates the sampling valve to the
INJECT position. The
green wire is the control
cable's GROUND. These wires
can he connected to data system
relays orother switches. Plug the
power cables
into
an ACoutlet and
allowthe system
to
wann up. It
is
nowready for use.
/
Healed sample
transfer
line
NllI.
COIUins
Tefl~
redueioa:
ferrule
Valvecontrol
cablee
.. for infOf"ln&lion
reprdiIlg
rainbow ribbou
cable
UIed
for
remote
COdnlI
1Wi0ll .election, _
INJECTOR
&;
GAS VAl..VE
IeClion
of thi.
rna3LI.l.
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:':':':':':':':.:-:
.......
\t
•...........•.•...•..
SIDE VIEWSHOWING
CONNECTIONS
D:\EP2DOCS\ IOSTASTD.EPD
