PAL3 TDAS 2020

PAL3 Thermal Desorption AutoSampler


The PAL3 TDAS 2020 was developed by CHROMTECH for fully automated thermal desorption in combination with PAL3 RSI/RTC. Organic compounds that vaporize or semi-vaporize can easily be analyzed in solid, liquid or gaseous samples with the PAL3 TDAS 2020 connected to a GC or GC/MS system.


PAL3 TDAS 2020



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 PAL3’s injection
unit. As soon as the vial is placed into the heater, the injection unit pushes the vial and heater 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 vial and onto the cooled PTV. All analytes are thereby refocused
onto the cooled liner. After a 3 – 5 minute desorption at a high temperature, the PAL3 moves the thermal desorption unit out of the inlet.
At that point, the flow is redirected back to the inlet, so that it no longer passes through the sample. After a short equilibration time, the
PTV inlet heats rapidly to its maximum temperature. Doing the heating while the PTV is in splitless mode will provide maximum sensitivity.



System features

  • Ideal for food and flavor analyses
  • Solid sample analyses for semiconductor and plastics industries
  • Easy to use for gas samples, using pre-filled (Tenax, Carbotrap, etc.) adsorption tubes
  • Sample capacity of up to 296 samples
  • No transfer lines and no switching valves. No carryover
  • Crimped sample container. No contamination of sample
  • Easy mounting on top of GC. Quick installation and removal
  • Smart vial transport by PAL3 RSI/RTC - System
  • Direct thermal extraction from sample vial to GC injector.
  • Heater oven temperature of up to 350° C
  • Adaptable to existing PTV inlet, cooled with LN2, LCO2 or pressurized air (PFC-Option)
  • Adaptable to existing S/SL-inlet, using e-Trap/e-Trap+ for cryo focussing
  • Software fully integrated in CDS


  • Food and flavor industry
  • Environment – air sampling
  • Plastics industries




The TDAS 2000 system is the predecessor of the PAL3 TDAS 2020, compatible with CTC CombiPal / -xt. Features and specifications are identical to PAL3 TDAS 2020.

TDAS 2000

TDAS 2000

Automatic tube transport



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