Twister Desorption Unit
The GERSTEL Thermal Desorption Unit (TDU) was initially developed to be a dedicated instrument for use with GERSTEL Twister stir bars, but it is now used for 5 different sample introduction techniques. The TDU is used with the GERSTEL Cooled Injection System (CIS) on a GC or GC/MS system to enable ultra-trace analysis of a wide range of samples.
The TDU mounts directly onto the CIS, eliminating the need for a transfer line. The TDU desorption liner mates directly with the glass inlet liner of the CIS—this novel liner-to-liner design prevents analytes from contacting active sites and thus provides a completely inert sample path. Prior to insertion of the desorption tube into the TDU, GC column head pressure is reduced to zero to prevent back-flush of sample or damage to the column. Transfer into the TDU is performed manually using a specifically designed transport ”pen”, or automatically with the MPS 2 Twister option.
Main Features and Advantages
- Extremely versatile - 5 sample introduction techniques
- Stir Bar Sorptive Extraction - SBSE (Twister)
- Adsorbent Tube Thermal Desorption (air sampling)
- Direct Thermal Desorption
- Automatic Tube Exchange - ATEX
- Dynamic Headspace - DHS
- Modular design, easy to add other sample introduction techniques
- Complete software control with Maestro software
- Can be integrated into Agilent Technologies ChemStation
- Electronic pressure control for ease of use and reproducibility
- Valveless operation reduces contamination and downtime
- Short, inert high temperature (350ºC) flow path
- Multiple temperature ramps
- Purges oxygen and water from sample
- True splitless operation
- Small footprint
