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Thermal desorption encompasses two primary functions: sample collection/concentration and transfer to a detector.

The use of adsorbents and large sample volumes to collect vapor phase compounds, (such as VOC's in air or residual components from solids), facilitates accurate analysis even when sample levels are very low.

Organics are concentrated on sorbent media while the sample matrix, air or water, is discarded. In much the same way as a vacuum cleaner filters dust from air as it sweeps over a surface, Dynatherm instruments capture compounds of interest on adsorbent material packed in glass cartridges. Collected compounds are then introduced into another analytical instrument, typically a gas chromatograph, where they are separated, measured, and identified.

Thermal desorption uses heat, (instead of solvent extraction), to release organic compounds from the adsorbent and transfer the entire collected sample to a gas chromatograph for analysis. This eliminates extraction time, (typically 12-24 hours), a solvent peak in the chromatogram (which can mask compounds of interest), and waste solvent disposal, an increasing expense in many labs.

The process is flexible and convenient. For example, an investigator equipped with a battery-powered sampler can quickly collect liters of air on a sorbent tube and bring it to the lab for analysis. Alternatively, the thermal desorber/GC instruments can be mobilized for direct source sampling in the field.

When samples are collected in areas of high humidity, two-stage sorbent trapping and thermal desorption effectively eliminate water interferences and enhance analysis of polar compounds in the sample stream. (Other collection techniques, such as canister sampling, must limit sampling volumes to control the amount of water transferred to the GC, which tends to lower sensitivity as well as restrict recovery of polar compounds.)

Available models

CDS 9300 Thermal Desorption
Specifications
Programmable Time's
0 - 999.9 minutes
Focus Trap
Yes, Standard 1/8" Vocarb Optional 6 mm Tenax-TA
Dynamic Range
C2-C33+
Cyrogen
Not Required. Standard Pre-Desorb 
Temperature Accuracy
1°C
Tube Heating Rate
1000°C/min
Trap Heating Rate
900°C/min
Valve Oven
Up to 350°C
Transfer Line
Up to 350°C 
Sample Desorb
Up to 400°C
Focus Desorb
Up to 400°C
On-Line Sampling
Not supported
GC Connection
Heated Transfer Line
Weight
17 kg
Dimension (W x H x D)
13" X 11" X 18"

CDS's base model instrument for single tube desorption.

The CDS 9300 Thermal Desorption system is the base model for single tube desorption. It features a hand-held controller for system maintenance and direct communication. With the highest programmable valve temperature on the market (350°C), the 9300 can venture into applications where other systems cannot perform, including VOCs, sVOCs, polar and nonpolar compounds. The two-stage trapping and desorption process with Pre-desorb and Pre-heat feature eliminate the need of any Peltier cooling or liquid cryogen to improve the resolution for early eluting molecules.

Key features

  • Versatile configurations to mainstream TD tubes
  • Cryogen free with pre-desorb and pre-heat
  • Hand-held plug-in control interface
  • High temperature valve oven at max 350°C
  • Built tough with easy maintenance
  • Powerful windows based software
CDS 9305 Thermal Desorption
Specifications
Programmable Time's
0 - 999.9 minutes
Focus Trap
Yes, Standard 1/8" Vocarb Optional 6 mm Tenax-TA 
Dynamic Range
C2-C33+
Cyrogen
Not Required. Standard Pre-Desorb
Temperature Accuracy
1°C
Tube Heating Rate
1000°C/min
Trap Heating Rate
900°C/min
Valve Oven
Up to 350°C
Transfer Line
Up to 350°C 
Sample Desorb
Up to 400°C
Focus Desorb
Up to 400°C
On-Line Sampling
Near-real Time, Single Tube
GC Connection
Heated Transfer Line
Weight
19 kg
Dimension (W x H x D)
13" X 11" X 18"

Near-real time sampling Thermal Desorption system.

The CDS 9305 Thermal Desorption system adds a Mass Flow Controller (MFC) for near-real time sampling. It features a hand-held controller for system maintenance and direct communication. With the highest programmable valve temperature on the market (350°C), the 9305 can venture into applications where other systems can not perform, including VOCs, sVOCs, polar and nonpolar compounds. The two stage trapping and desorption process with Pre-desorb and Pre-heat feature eliminate the need of any Peltier cooling or liquid cryogen to improve the resolution for early eluting molecules. An optional heated sampling line is available to collect air samples.

Key features

  • Versatile configurations to mainstream TD tubes
  • Cryogen free with pre-desorb and pre-heat
  • Hand-held plug-in control interface
  • High temperature valve oven at max 350°C
  • Built tough with easy maintenance
  • Powerful windows based software
  • Built-in MFC
  • Quick connect to vacuum
  • Compatible to summa canister
CDS 9350 Thermal Desorption
Specifications
Programmable Time's
0 - 999.9 minutes
Focus Trap
Yes, Standard 1/8" Vocarb, Low Thermal Mass
Dynamic Range
C2-C33+
Cyrogen
Not Required. Pre-Desorb
Temperature Accuracy
1°C
Tube Heating Rate
1000°C/min
Trap Heating Rate
900°C/min
Valve Oven
Up to 350°C
Transfer Line
Up to 350°C 
Sample Desorb
Up to 400°C
Focus Desorb
Up to 400°C
On-Line Sampling
Continuous with Dual Tubes
GC Connection
Heated Transfer Line
Weight
21 kg
Dimension (W x H x D)
16" X 11" X 18" 

CDS 9350 supports continous real time air monitoring through a dual tube setup.

​ The CDS 9350 Thermal Desorption system is designed for continuous real time air monitoring with a dual thermal desorption tube setup. It features a hand-held controller for system maintenance and direct communication. With the highest programmable valve temperature on the market (350°C), the 9350 can venture into applications where other systems cannot perform, including VOCs, sVOCs, polar and nonpolar compounds. The two-stage trapping and desorption process with Pre-desorb and Pre-heat feature eliminate the need of any Peltier cooling or liquid cryogen to improve the resolution for early eluting molecules. An optional heated sampling line is available.

Key features

  • Versatile configurations to mainstream TD tubes
  • Cryogen free with pre-desorb and pre-heat
  • Hand-held plug-in control interface
  • High temperature valve oven at max 350°C
  • Built tough with easy maintenance
  • Powerful windows based software
  • Dual TD tubes
  • Low thermal mass trap
  • Optional heated sampling line
CDS 7550 Thermal Desorption
Specifications
TD Tube Positions
72
Tube Supported
6mm x 4.5" and 1/4" x 3.5"
Concentrator
CDS 7000E Required
 Concentrator Connection
Heated Transfer Line (350°C)
Internal Gas Addition
Yes, optional
Sample Saver
Yes, optional
Tube Heating Rate
1000°C/min
Sample Desorb
Up to 400°C
Weight
23 kg
Dimension (W x H x D)
56.9cm X 48.2cm X 62.2 cm
Options
Purge and Trap

72 position autosampler for 9300 family improve productivity and efficiency.

Operating on the 2nd generation autosampler, the CDS 7550 is capable of 3D positioning within 1 mm, and thanks to its unique user settable calibration, it could handle standard 3.5" Thermal Desorption tube from any manufacturer. These features make CDS 7550 the most reliable Thermal Desorption autosampler available to the market. The Internal Standard module and Sample Saver module are optional. The CDS 7550 Thermal Desorption Tower could be purchased separately and added to your existing 7450 system to expand the sample introduction capability from Purge and Trap to Thermal Desorption. The switch process is engineered to be effortless.

Key features

  • 72 position autosampler
  • Excellent TD tube compatibility
  • Precision robotic arm
  • Optional sample saver
  • Optional gas IS module
  • Built-in leak check
CDS 7550S Thermal Desorption
Specifications
TD Tube Positions
72
Tube Supported
1/4" X 3.5" Or 6 mm X 4.5"
Concentrator
Built-in
Focus Trap
Low Thermal Mass Vocarb
Pre-Desorb Pre-Heat
Yes, Standard
Peltier
Yes, Optional from -25°C
Tube Heating Rate
1000°C/min
Trap Heating Rate
900°C/min
Valve Oven
Up to 350°C
Transfer Line
Up to 350°C 
Sample Desorb
Up to 400°C
Focus Desorb
Up to 400°C
GC Connection
Heated Transfer Line
Internal Standard
Yes, optional
Sample Saver
No
Weight
23 kg
Dimension (W x H x D)
56.9cm X 48.2cm X 62.2cm

Stand-alone 72 position Thermal Desorption system

The CDS 7550S is a stand-alone 72 position Thermal Desorption Autosampler which does not need a separate sample concentrator, like the 7550 model. Built on the 2nd generation autosampler platform, the CDS 7550S is capable of 3D positioning within 1 mm, and thanks to its unique custom calibration, it could handle 3.5" standard Thermal Desorption tube from any manufacturer. These features make CDS 7550 the most reliable Thermal Desorption autosampler available to the market. The 7550S adopts two focus modes as Pre-desorb\Pre-heat function for high humidity sample, and optional Peltier module for lighter compounds, to improve the resolution of early eluting peaks.

Key features

  • 72 position autosampler
  • Dual mode focusing trap
  • Stand-alone autosampler
  • High temperature valve oven programmable to 350°C
  • Excellent TD tube compatibility
  • Powerful windows based software
  • Built-in leak check
  • Optical sensor
  • Precision robotic arm
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CDS AnalyticalCDS Analytical is a leading global provider of innovative thermal sample preparation instrumentation for the analytical laboratory. For over 35 years our exclusive focus has been on conceiving, designing, manufacturing, and supporting leading edge instruments. CDS offers a complete suite of diverse front-end GC equipment including pyrolyzers, purge and trap, headspace, and thermal desorption systems. These robust, field-tested products provide the entire range of temperature, heating rate, and multiple step manipulations required by today's most demanding analytical laboratories. With a well-established leadership role with pyrolyzers and other introduction systems, as well as broad market penetration on a global scale, CDS continues to be innovative and dynamic, and will pioneer the next wave of sample introduction instrumentation.
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