Gerstel Thermal Desorption Unit

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Thermal Desorption Unit

The Thermal Desorption Unit (TDU) is a flexible automated solution for thermal desorption and thermal extraction.

Several techniques are supported by the TDU:

  • Stir Bar Sorptive Extraction (SBSE) using the GERSTEL Twister®
  • Dynamic Headspace based on standard headspace vials
  • Air sampling onto adsorbent tubes combined with thermal desorption
  • Thermal extraction of solid samples placed in µ-vials inside the TDU
  • Direct introduction and thermal extraction of liquids such as standards
  • Automated pyrolysis of liquid and solid samples using the Pyrolysis Module

The TDU supports manual operation and it can be removed in seconds to enable direct liquid sample introduction into the GERSTEL Cooled Injection System (CIS), a PTV-type universal GC inlet.

When configured with the GERSTEL MultiPurpose Sampler (MPS), up to 196 sampels can be analyzed in one automated sequence using one or more methods. The MAESTRO software combined with the Agilent ChemStation controls the complete process from sample introduction through thermal desorption to GC/MS analysis with one method and one sequence table ensuring efficient and error-free operation.

TDU2_Flyer_en

Product Specifications

Uses
  • Thermal desorption of analytes that have been concentrated on a GERSTEL Twister® or on adsorbent placed in a TDU tube
  • Direct thermal extraction of analytes from solid or liquid samples
  • Direct injection of liquid samples into the TDU and subsequent transfer to the Cooled Injection System (CIS)
  • Direct injection of liquid samples with a heavy matrix load into micro-vials placed in the TDU, followed by thermal extraction and removal of the matrix residue along with the used micro-vial
  • Injection of liquid standards
System Configuration
  • compatible with most standard GCs
  • GERSTEL CIS fitted with a special TDU liner is used for analyte prior to GC or GC/MS analysis
Cooling Options
  • cryostatic cooling CCD
  • Peltier cooling UPC
Minimum Temperature
  • +10oC (with cryostatic cooling CCD)
  • +10oC (with peltier cooling UPC, depending on transfer temperature)
Cooling Rate From 300oC to 20oC in 30 seconds (using UPC
Temperature Programming
  • 2 temperature ramps
  • Heating rate maximum 720oC/min
  • Initial temperature 10 … 350oC
  • 1. hold temperature 10 … 350oC
  • 2. hold temperature 10 … 350oC
  • Hold time maximum 650 min for each hold temperature
Sample transfer modes to the CIS
  • split
  • splitless
  • solvent venting
Transfer Temperature
  • Maximum 350oC
  • Fixed or in TDU tracking mode (with max. 120oC/min)
Desorption Mode
  • Retain tube – standby cooling (the tube remains in the TDU after desorption, the TDU is cooled to the standby temperature)
  • retain tube – no cooling (the tube remains in the TDU after desorption, the cryo cooling is switched off at GC start
  • remove tube – standby cooling (the tube is removed from the TDU after desorption, the TDU is cooled to the standby temperature)
  • remove tube – no cooling (the tube is removed from the TDU after desorption, the TDU is switched off at GC start
Pneumatics
  • Pressure release for sample loading and unloading
  • Flow, pressure and split ratio controlled through the GC pneumatics, depending on the GC model, or through the CIS pneumatics
Control
  • Based on one of the controller C505 or C506
  • In combination with the GERSTEL MAESTRO Software, integrated in the Agilent® Technologies ChemStation software or operated in stand-alone mode
  • Only one method and one sequence table required for the complete system including GC/MS when integrated in the ChemStation Software
Automation ATEX Option for automated processing of up to 196 Twister® using the GERSTEL MultiPurpose Sampler (MPS)
Regulatory Certifications & Standards
  • DIN EN 61010-1/A2:1996
  • DIN EN 61326:2004-05
  • IEC 61010-1:1990/A1:1992/A2:1995
  • IEC 61326:2002
  • UL STD 3101-1;93
  • CAN/CSA C22.2 NO.1010.1-92
Operating conditions
  • 15 … 35oC
  • relative humidity max. 50 – 60%, non-condensing
  • max. 4615 m above sea level
Storage Conditions
  • -20 … 50oC
  • relative humidity max. 50 – 60%, non-condensing
  • max. 4615 m above sea level
Dimension (H x W x D) 94 x 124 x 77 mm
Weight 1.2 kg
Power Consumption Max. 110 Watt
Tube Types
  • TDU tubes for GERSTEL Twister®, 60 x 6 x 5 mm(L x OD x ID)
  • TDU tubes, 60 x 6 x 4 mm (L x OD x ID)
  • Length of heated area approximately 20 mm
  • Empty or packed
  • Special micro-vials for up to 100 µL sample volume available
  • More detailed information is available in a separate flyer
Tube Types
  • TDU tubes for GERSTEL Twister®, 60 x 6 x 5 mm(L x OD x ID)
  • TDU tubes, 60 x 6 x 4 mm (L x OD x ID)
  • Length of heated area approximately 20 mm
  • Empty or packed
  • Special micro-vials for up to 100 µL sample volume available
  • More detailed information is available in a separate flyer
TD Pneumatics Box
  • Switches between TDU split and CIS split
  • Controls pressure release for sample loading and unloading
  • 4 LEDs provide quick status overview
  • 1 x split output to CIS pneumatic
  • 1 x TDU split input
  • 1 x CIS split input
  • 1 x compressed air input
  • 1 x valve control interface
  • 1 x pneumatic control interface
  • Dimensions 200 x 100 x 175 mm (L x H x W)
  • Weight 1.5 kg
Accessories & Options
  • ATEX option (Automated Tube Exchange) – for automated liquid injection into the TDU liner, typically using a micro-vial insert, followed by thermal extraction of the liquid and tube exchange in a GERSTEL Thermal Desorption Unit (TDU)
  • DHS – for automated dynamic headspace analysis up to 98 samples
  • Tube Conditioner (TC2) – for simultaneous thermal conditioning of up to ten TDU tubes or up to 50 Twister® under a flow of inert gas
  • Gas Sampler 1 (GS1) – compact, microprocessor controlled whole air sampler with built-in sample changer for up to 10 TDU tubes
  • MPS-HIT – for automated Headspace or SPME Injection through the TDU into the CIS