TDAS 2000: Transports desorption vials automaticly via injection unit

 

• Ideal for foodflavor analyses
• Solid sample analyses for semiconductorplastics industries
• Easy to use for gas samples, using pre-filled adsorption tubes
• Sample capacity of up to 296 samples
• No transfer linesno switching valves. No carryover
• Crimped sample container. No contamination of sample
• Easy mounting on top of GC. Quick installationremoval
• Smart vial transport by PALSystem
• Direct thermal extraction from sample vial to GC injector.
• Heater oven temperature of up to 350''C
• Adaptable to existing PTV injectors
• Software integrated with HP/Agilent ChemStation or ThermoFinnigan Xcalibur

Description

CHROMTECH is known for its reliable automation products. Based on that reputation, we have designed an easily attachable thermal desorption system. At the same time, the Combi PAL still performs its headspace, SPMEliquid injections. It can be transformed to a thermal desorption system in five minutes or less. Given CHROMTECH''s background in automation, our focus is on large-sample capacity. Up to 294 samples can be analyzed using our system.

The PAL TDAS features a unique, retractable desorption heater that is mounted on top of the GC injector.No heated transfer lines and/or switching valves are in its flowpath. The body of the thermal desorption unit retracts, so that errors related to sample contaminationlow reproducibility are eliminated.Generally, PTV injectors-cooled by liquid nitrogen or CO2-are used in conjunction with our system for thermal desorption analysis.

The system works as follows. First, desorption vials, crimped with regular caps, are transported from the sample tray to the heater inlet port by the PAL''s injection unit. As soon as the vial is placed into the heater, the injection unit pushes the vialheater downwards, piercing both vial ends. The bottom of the heater, which is fitted with a syringe needle, injects the sample into the PTV when the heater is pushed down. The carrier gas flow then switches direction, passing through the desorption vialonto the cooled PTV. All analytes are thereby refocused onto the cooled liner. After a 3-5 minute desorption at a high temperature, the PAL will move the thermal desorption unit out of the inlet. At this point, the flow will be redirected back to the inlet, so that it no longer passes through the sample. After a short equilibration time, the PTV inlet will heat rapidly to its maximum temperature. If you choose to do the heating while the PTV is in splitless mode, it will provide maximum sensitivity.
TDAS 2000: Direct injection into PTV

Ambient Air:5.3 litres pretrappeddesorbed with TDAS 2000

Applications

Thermal desorption is a long-known technique, which offers a wide range of applications. Most common applications include gas analyses with adsorption materials like Tenax or Carbotrap. For your convenience, you can purchase packed tubes with any kind of trapping material from Supelco.

Other applications include the analysis of solids, which is an extremely sensitive technique. Typical thermal desorption applications involve foodflavor, plasticenvironmental samples. Any material can be packed into the sample glass tube. The use of a closed container ensures that any analytes will stay within the glass tube. Moreover, it is easy to take field samplesanalyze them in your laboratory at a later time.