C15
AutoDesorb
TM
Needles, Seals & Connecting Tubes
Scientific Instrument Services, Inc.
TM
FAX: 908-806-6631
www.sisweb.com/catalog/08/C15
Needles for the AutoDesorb System
I
n the AutoDesorb
TM
System, the needle serves as the
transfer line for the introduction of the sample into the Gas
Chromatograph. This "short path" for sample transmission
is the key advantage of the Short Path Thermal Desorption
technology which minimizes sample decomposition, eliminates
system contamination and provides for the maximum delivery of
samples to the GC.
This 2 piece needle has been specifically designed for the
AutoDesorb system. The new design will permit the sealing of the
needles and connecting tube to the desorption tube with just a
finger tight twist connection. Vespel
TM
seals (sold separately) are
used to make the leak tight seal. Double seals are not needed as
in TD3 and TD4 systems. The needles are of the side port design
to eliminate coring of the GC septa and are 35 mm long. The nee-
dles are available in plain stainless steel and now also in Silco
TM
coated steel to eliminate any metal surface in contact with your
samples.
These needles and seals can also be used in the Older models
of the Thermal Desorption system ( Models TD3 and TD-4) as well
as the most current version, TD5.
Seals for the AutoDesorbTM System
A single one-piece Vespel
TM
seal is used to make the leak tight
seal between the desorption tube and the needle as well as the
desorption tube and the connecting tube. These seals permit the
finger tight sealing of the desorption tube to the system. Wrenches
and tools are not required. Seals can be used up to 450°C. The
double seals used in the TD5 are not used in the AutoDesorb
system
Connecting Tubes and `O' Rings for the
AutoDesorb System
The AutoDesorbTM System is shipped with 12 Connecting
tubes, however the user may wish to obtain additional spare con-
necting tubes. These connecting tubes are designed exclusively
for the AutoDesorb system and require both an `O' Ring (purchased
separately below) and a Vespel Seal (purchased separately as
listed above).
Built into each connecting tube is a trap filter. This filter is
packed with 40 milligrams of Carbotrap and is used as a final filter
to assure clean carrier gas is passed through you sample. The trap
filter can be cleaned by baking out in the tube conditioning oven
Connecting
Tube
O Ring
Seal
with
Cartridge
Desorption
Tube
Vespel Seal
Desorption
Tube Needle
Seal Removal
Tool
2 Piece Desorption Tube Needle and Cross Section
Showing placement of the needle
and seal.
Connecting Tube,
and Needle Assembly
Part No.
Description
AutoDesorb Needle, 35 mm
AutoDesorb Needle, 35 mm, Silco
Part No.
Description
Vespel Seal for AutoDesorb tubes
Vespel Seal with Cartridge
Seal Removal Tool
Part No.
Description
AutoDesorb Connecting Tube
VitonTM
TM
O Ring for Connecting Tube
tip...
