Innovative Technology For Trace Organic Analysis
TEL: +44 (0)1443 230 935
Mobile Menu


Uninterrupted monitoring of trace chemical vapours

TT24-7™ is an advanced thermal desorption system for continuous near-real-time (NRT) monitoring of VOCs and SVOCs in air or gas.

TT24-7 ensures 100% data capture by using a twin-trapping design that can accommodate a wide range of sampling flow rates. As with all Markes’ thermal desorption instruments, TT24-7 operates completely cryogen-free, enabling it to be used in both static and mobile laboratory facilities.

Who uses the TT24-7?


TT24-7 is ideal for those needing to continuously monitor air or gas streams for trace-level organic compounds by GC. It allows the risk of exposure to hazardous chemicals to be minimised by responding rapidly to changes in airborne concentrations.


Product benefits

  • Reliable, trace-level detection – TT24-7 delivers unparalleled sensitivity and selectivity, even in dirty environments. It eliminates false negatives and minimises false positives.
  • Get your results in near-real-time with fast cycle times.

  • Rest assured that the continuous monitoring provides 100% data capture – no blind spots.

  • Convenience – cryogen-free operation makes the system suitable for static and mobile laboratories.

  • Flexibility – the cryogen-free design makes TT24-7 suitable for use in either static or mobile laboratories.

  • Peace-of-mind – you are buying a quality product from the recognised leader in thermal desorption instrumentation.


  • Highly time-resolved data – Cycle times as low as 3–5 minutes.

  • Dual-trap continuous monitoring – 100% data capture.

  • High sensitivity and wide range of sampling flows (up to 800 mL/min) with quantitative trapping.

  • Inert, uniformly-heated flow path offers compatibility for C2–C40 compounds and reactive species.

  • Split and re-collect samples on to sorbent tubes for backup or re-analysis.

  • Efficient desorption means no cross-contamination, and improves chromatographic resolution, minimising false positives. 
  • Small footprint – Suitable for mobile laboratories.
  • Operates cryogen-free – Ideal for unattended remote-site operation over extended periods.
  • Compatible with any make of GC and fast GC.


Key applications


  • Defence and homeland security.
  • Environmental and workplace air monitoring.
  • Cleanroom air monitoring

  • Monitoring of odour and fragrance profiles.

Gallery Images

Click on an image for a larger view.
Markes International Ltd
Gwaun Elai Medi-Science Campus
Tel: +44 (0)1443 230935
Markes International GmbH
Bieberer Straße 1-7
63065 Offenbach am Main
Tel: +49 (0)69 6681089-10
USA (West)
Markes International, Inc.
2355 Gold Meadow Way
Gold River, Sacramento
California 95670
Tel: +1 866-483-5684 (toll-free)
Markes Instruments (Shanghai) Co., Ltd
Unit 1002, Building 1
No.418, Guilin Road
Shanghai 200233
P.R. China
Tel: +86 21 5465 1216
Part of Schauenburg International

Hello, how can we help you today?