SIS AutoDesorb® Model 2000 Short Path Thermal Desorption System

12-sample Automated Short Path Thermal Desorption System for the analysis of volatiles and semi-volatiles by GC and GC/MS systems.

The PC-controlled SIS Automated Short Path Thermal Desorption System (AutoDesorb) provides continuous and unattended thermal extraction of volatile and semi-volatile organics from solid, liquid and gas samples for analysis by GC and GC/MS. The system consists of the Thermal Desorption Unit Tower (right) and Electronics Console (left). The Tower sits directly on top of the GC injection port of an Agilent (HP) 6890 or 5890 GC. Due to its "short path" of sample flow, this new system overcomes the shortcomings of previous desorption systems by eliminating transfer lines, which are easily contaminated by samples, and by providing the optimum shortest path delivery (and therefore maximum sensitivity) of samples to the GC injector, i.e. direct injection into the GC, like using a GC injection syringe. It is designed for the automatic and unattended pickup, injection and thermal extraction of volatile and semi-volatile organics from solid, liquid and gas samples for analysis by GC and GC/MS. The system PC controlled and fully integrated with Agilent ChemStation. The system has been shown to be an invaluable tool in hundreds of different applications.

The AutoDesorb is the 12-sample, automated version of our patented single-sample SIS Short Path Thermal Desorption System (TD-4).

Main Points

The AutoDesorb System uses the SIS “Short Path Thermal Desorption" technology. The "short path" provided by the desorption tube needle eliminates the shortcomings of other thermal desorption systems by providing for the maximum delivery (and therefore maximum sensitivity) of samples to the GC. Both the Purge & Trap technique and Direct Thermal Extraction technique can be used for the analysis of volatile as well as semi-volatile organics.

The Short Path Thermal Desorption Technology provides several unique advantages over other desorption systems:

First, it enables the sample, which is trapped on an adsorbent media contained in a glass lined stainless steel tube (GLT desorption tube), to be subjected to rapid (ballistic) heating. The AutoDesorb System can desorb samples at temperatures up to 450º C and at ramp rates up to 100º C per minute. Desorption times can be set from 1 second to 99 minutes. Multi-step desorption block heater ramping with hold times can also be programmed. 

Second, the desorbed component can be easily and efficiently transferred into the injection port of the gas chromatograph from a glass lined stainless steel sample tube and its associated injection needle. This provides for a short transfer path for the sample in an inert environment to minimize the degradation of labile sample components which often decompose upon contact with the hot catalytic metal wall surfaces of the transfer path of other systems.

Third, each sample has its own individual adsorbent trap and needle to eliminate the possibility of cross-contamination from sample to sample, thus preventing any "memory effect" due to overloading of the sample in the GLT desorption tube or due to residues from previous samples.

Fourth, the new automated system permits the unattended analysis of multiple samples thereby increasing the productivity of the laboratory.

For more details, see the AutoDesorb Theory of Operation or the 12-page product flyer (PDF).

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