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D33
GC Injection Port Liners and Seals
Scientific Instrument Services, Inc.
™
FAX: 908-806-6631
www.sisweb.com/catalog/08/D33
Part No.
Description
SIPL10 Part #SIPL10--Click to order
Current Price: $55.00
Unit of Measure: EA
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GLT Low Volume Injection Port Liner, Agilent 5890 & 6890 GC
SIPL11 Part #SIPL11--Click to order
Current Price: $55.00
Unit of Measure: EA
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GLT Low Volume Injection Port Liner, Varian 3400GC
T
hese new Low Dead Volume Injection Port Liners
have been specifically designed for use with the
Scientific Instrument Services Short Path
™
Thermal
Desorption System but could also be utilized with other injection
systems and techniques. It is designed to provide for a low dead
volume injection port with uniform heat dissipation over the
entire injection port length and also to provide for the maximum
heat transfer to the injecting needle.
Conventional injection port liners are constructed of glass or
quartz glass and normally have an inner diameter of 2.0 to 4.0
mm to allow for the vaporization and expansion of liquids when
they are injected into the GC injection port. However when
using the Thermal Desorption technique, the sample is being
introduced in the gas phase and no expansion volume is
required. In fact this expansion volume is a deterrent to
optimum performance when using the Thermal Desorption
technique. This dead volume around the syringe needle
impedes optimum heat transfer from the injection port to the
syringe needle. As a result the syringe needle is at a lower
temperature than the injection port itself. For most compounds
this is not a major problem, however when analyzing
semi-volatiles or other higher molecular weight compounds it
can pose limitations to the technique by causing these higher
boiling compounds to condense in the syringe needle before
they are introduced into the injection port. Also the glass liner
itself is a poor conductor of heat to the sample or syringe
needle. These problems are compounded in some instruments
such as in the Agilent split/splitless injection port. In order to
reduce septum bleed, these injection ports have a temperature
differential of up to 100° from the middle of the injection port
where the temperature is regulated to the top area of the
injection port near the septum. This design feature can further
complicate the Desorption of high boilers into the GC injection
port by causing these semi-volatiles to condense in the syringe
needle near the septum area of the injection port.
The new Low Dead Volume Injection Port Liners were
designed to minimize or eliminate the shortcomings of the
conventional Glass or Quartz injection port liners. The main
body of the injection port liner is constructed of Glass Lined
Stainless Steel Tubing. This stainless steel body provides for
better heat transfer over the entire length of the injection port
liner due to the improved thermal conductivity of the metal
versus the glass liners. The glass liner is deactivated to
minimize sample decomposition. The top half of the injection
port liner has an inner diameter of 0.75 mm and closely fits
around the injecting needle. This provides for the optimum
transfer of heat from the injection port liner to the injecting
needle eliminating cold spots in the syringe needle and enabling
the transfer of higher boilers into the GC injection port. The
bottom half of the injection port liner has an inner diameter of 1.0
mm to permit the introduction of samples from all types of
syringe needles including the side port needles commonly used
with the S.I.S. Thermal Desorption System. Both the upper and
the lower inner surfaces of the injection port liner are glass lined.
The net result is an injection port liner with low dead volume and
good heat transfer to the injecting needle to permit the analysis
of a wider range of compounds using the Short Path Thermal
Desorption Technique.
Similar designs for other gas chromatographs are also avail-
able on request.
0.75mm
diameter
1.0mm
diameter
Cross section of Injection Port Liners
Features
•
Designed for Thermal Desorption and
Headspace Techniques
•
Low Dead Volume
•
Maximum Heat Transfer to Injecting Needle
•
Uniform Heat Transfer Over Entire
Injection Port Length
•
Increased Detection Level for Semi-volatiles
Ordering Information
GLT Low Volume Injection Port Liners are
ideal for Thermal Desorption and head-
space GC injection.
GC Low Dead Volume Injection Port Liners for Thermal Desorption
Inert
Glass Liner
Inert
Glass Liner
0.75mm
diameter
1.0mm
diameter
Stainless
Steel Outer
Sheath
Related information may be found on the following pages of our web site:
PageParts
GC Low Dead Volume Injection Port LinersSIPL10, SIPL11
Page Number: [ previous page next page ]
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