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.)
Specifications
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Programmable Time's
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0 - 999.9 minutes
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Focus Trap
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Yes, Standard 1/8" Vocarb Optional 6 mm Tenax-TA
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Dynamic Range
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C2-C33+
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Cyrogen
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Not Required. Standard Pre-Desorb
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Temperature Accuracy
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1°C
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Tube Heating Rate
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1000°C/min
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Trap Heating Rate
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900°C/min
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Valve Oven
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Up to 350°C
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Transfer Line
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Up to 350°C
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Sample Desorb
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Up to 400°C
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Focus Desorb
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Up to 400°C
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On-Line Sampling
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Not supported
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GC Connection
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Heated Transfer Line
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Weight
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17 kg
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Dimension (W x H x D)
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13" X 11" X 18"
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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
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
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Up to 350°C
|
Sample Desorb
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Up to 400°C
|
Focus Desorb
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Up to 400°C
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On-Line Sampling
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Near-real Time, Single Tube
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GC Connection
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Heated Transfer Line
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Weight
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19 kg
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Dimension (W x H x D)
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13" X 11" X 18"
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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
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
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Up to 400°C
|
Focus Desorb
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Up to 400°C
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On-Line Sampling
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Continuous with Dual Tubes
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GC Connection
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Heated Transfer Line
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Weight
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21 kg
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Dimension (W x H x D)
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16" X 11" X 18"
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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
Specifications
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TD Tube Positions
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72
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Tube Supported
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6mm x 4.5" and 1/4" x 3.5"
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Concentrator
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CDS 7000E Required
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Concentrator Connection
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Heated Transfer Line (350°C)
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Internal Gas Addition
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Yes, optional
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Sample Saver
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Yes, optional
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Tube Heating Rate
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1000°C/min
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Sample Desorb
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Up to 400°C
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Weight
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23 kg
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Dimension (W x H x D)
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56.9cm X 48.2cm X 62.2 cm
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Options
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Purge and Trap
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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
Specifications
|
|
---|---|
TD Tube Positions
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72
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Tube Supported
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1/4" X 3.5" Or 6 mm X 4.5"
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Concentrator
|
Built-in
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Focus Trap
|
Low Thermal Mass Vocarb
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Pre-Desorb Pre-Heat
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Yes, Standard
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Peltier
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Yes, Optional from -25°C
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Tube Heating Rate
|
1000°C/min
|
Trap Heating Rate
|
900°C/min
|
Valve Oven
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Up to 350°C
|
Transfer Line
|
Up to 350°C
|
Sample Desorb
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Up to 400°C
|
Focus Desorb
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Up to 400°C
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GC Connection
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Heated Transfer Line
|
Internal Standard
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Yes, optional
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Sample Saver
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No
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Weight
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23 kg
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Dimension (W x H x D)
|
56.9cm X 48.2cm X 62.2cm
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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