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
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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
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Cooling Options |
- cryostatic cooling CCD
- Peltier cooling UPC
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Minimum Temperature |
- +10oC (with cryostatic cooling CCD)
- +10oC (with peltier cooling UPC, depending on transfer temperature)
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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
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Sample transfer modes to the CIS |
- split
- splitless
- solvent venting
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Transfer Temperature |
- Maximum 350oC
- Fixed or in TDU tracking mode (with max. 120oC/min)
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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
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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
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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
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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
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Operating conditions |
- 15 … 35oC
- relative humidity max. 50 – 60%, non-condensing
- max. 4615 m above sea level
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Storage Conditions |
- -20 … 50oC
- relative humidity max. 50 – 60%, non-condensing
- max. 4615 m above sea level
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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
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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
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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
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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
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