Thermal Desorption

CDS 7550S

Product Features
72 Position Autosampler

CDS adopts a novel way to protect the TD tube by sealing in a reusable gas tight metal chamber, while waiting for the autosampler to pick up. 

Dual Mode Focusing Trap

To improve the resolution of early eluting molecules, CDS adopts pre-desorb and pre-heat technique along with Peltier cooling to mechanically and chemically confine analytes on the analytical trap to improve focusing

Stand-Alone Autosampler

The 7550S Thermal Desorption Autosampler has a built in focus trap and does not require a separate sample concentrator. 

High Temperature Valve Oven Programmable to 350°C

The high temperature oven (350°C)  significantly extends the analyte range from VOCs to sVOCs.  

Excellent TD Tube Compatibility

The autosampler can be configured to accommodate standard  1/4" x 3.5" TD tube from various manufacturers from its custom calibration interface

Powerful Windows Based Software

The software is Windows 10 compatible and gives the user full access to method editor and sequence table.

Built-in Leak Check

The automated leak check assures the system is air-tight before proceeding with the desorption of your sample. 

Thermal Slicing/Tube Conditioning

7550S has capability to perform programable vent based on desorption temperature. This feature could be used as tube conditioning after desorbing the target VOCs of interest. 

10,000:1 Sample Split

This optional sample split feature allows the 7550S to quantitatively transfer 1% of sample to GC. Combining with the GC sample split, this feature could offer up to 10,000:1 total split. 

Product Introduction

TD Tube Positions:

Tube Supported:


Focus Trap:

Pre-Desorb Pre-Heat:


Tube Heating Rate:

Trap Heating Rate:

Valve Oven:

Transfer Line:

Sample Desorb:

Focus Desorb:

GC Connection:

Internal Standard:

Sample Saver:


Dimension (W x H x D):


1/4" X 3.5" Or 6 mm X 4.5"


Low Thermal Mass Vocarb

Yes, Standard

Yes, Optional from -25°C



Up to 350°C

Up to 350°C 

Up to 400°C

Up to 400°C

Heated Transfer Line

Yes, optional


23 kg

56.9cm X 48.2cm X 62.2cm


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.


Request form for manuals and software

Thermal Desorption Series

CDS 9300
CDS 9300

CDS's base model instrument for single tube desorption.

CDS 9350

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

CDS 7550S

Stand-alone 72 position Thermal Desorption system

single chanel air sampler thumbnail whit
Sampling Devices

Portable single channel air sampler

CDS 9305

Near-real time sampling Thermal Desorption system.

Tube Conditioner

CDS's single and six tube conditioners are essential accessories for your analysis. 

CDS 7550

72 position autosampler for 9300 family improve productivity and efficiency. 

CDS Analytical LLC

465 Limestone Road

Oxford, PA 19363, USA

Phone: 1.800.541.6593

International: 1.610.932.3636

© 2017 CDS Analytical LLC All Rights Reserved