What is Markes’ Multi-Gas enabled thermal desorption technology?

What is Markes’ Multi-Gas enabled thermal desorption technology?

Markes’ Multi-Gas technology enables thermal desorption (TD) instruments to be run with three gases: helium, nitrogen and hydrogen.

It is the world’s first for TD instruments, and the UNITY-xr™, ULTRA-xr™ UNITY-ULTRA-xr Pro™ and TD100-xr™ have been independently certified for use with these three gases.

Each instrument has been externally tested and validated so that the full TD–GC–MS analytical instrumentation and workflow can be configured to work safely with hydrogen as carrier as well as with the other two gases.

1.49 MB

Why switch to Multi-Gas enabled technology?

Helium is a rapidly-dwindling, non-renewable resource, so it is becoming more difficult to source, which has led to disruption in supply, and more expensive to purchase. There are many benefits to switching to Multi-Gas enabled thermal desorbers. Being able to use hydrogen as a carrier gas instead of helium, for example, has the following benefits.

Enchanced Productivity

Hydrogen offers faster chromatographic separations, shorter TD methods and lower-temperature separations than helium, drastically increasing laboratory throughput, extending consumables’ lifetimes and extending maintenance intervals.
Hydrogen viscosity is about half that of helium, enabling it to be used at faster flow rates (linear gas velocities) without compromising chromatographic resolution.

Cost&Time Saving

Switching from helium to hydrogen saves up to 90% per cylinder.
A hydrogen generator eliminates the costs of cylinders together with their delivery, rental and system maintenance, and the need to install expensive pressurised gas supply lines and cylinder cages in new or refurbished laboratories.

Superior analytical performance

Hydrogen carrier gas routinely produces high-quality data and delivers results that comply with global tube-based TD–GC–MS standards.
Multi-Gas enabled TD instruments allow re-collection and repeat analysis to eliminate data loss, confirm results and validate analyte recovery in compliance with international standard methods.


Hydrogen generators provide consistent, high-quality carrier gas on demand, eliminate the risk of downtime due to delayed carrier gas cylinder deliveries and reduce reliance on personnel trained to change the cylinders.
Generators are ideal for remote, difficult to access or mobile laboratories.

Green Techonology

High-purity hydrogen can be generated from water, providing a sustainable carrier gas supply. Helium, on the other hand, is non-renewable and needs to be extracted, shipped and stored using specialist equipment, causing significant environmental impact.
An in-house generator eliminates the need for cylinder deliveries, significantly reducing the laboratory’s carbon footprint.


Multi-Gas thermal technology safeguards laboratory operations against the rising costs of high-purity helium.
Multi-Gas desorbers enables the development or transfer of methods using hydrogen as a carrier gas as workload and requirements evolve.

How easy is it to implement hydrogen carrier gas?

Very easy. The Multi-Gas TD instrument will be configured during installation by a trained engineer. Markes users will receive a tips and tricks video for a fast, easy and risk-free setup of their thermal desorption methods, while commercially available software can be used to translate the GC method from helium to hydrogen.

UNITY-xr™: Single-tube thermal desorption unit with unmatched upgradability

UNITY-xr™ is an industry-leading analytical TD instrument that provides exceptional performance for VOCs and SVOCs collected onto 3½-inch sorbent tubes, while offering unmatched upgrade flexibility for tube, canister and on-line automation. It’s perfect for laboratories with low throughput requirements that are starting out in TD, or for analysts needing a versatile thermal desorber for all their TD applications (whether tubes, canisters, or on-line).

Download product brochure! 


TD100-xr: Multi-tube thermal desorber for high-throughput automated analysis

TD100-xr™ is an automated thermal desorption system for the rapid and unattended processing of up to 100 × 3½-inch sorbent tubes in a single sequence. It’s the perfect thermal desorption unit for high-throughput analytical laboratories needing to process large numbers of tube-based samples automatically.

Download product brochure! 


UNITY–ULTRA-xr: Multi-tube thermal desorber with advanced upgrade options

UNITY–ULTRA-xr™ is an automated thermal desorption system for the rapid and unattended sampling of up to 100 sorbent tubes in a single sequence. Additional options include autosamplers for canister, bag or on-line analysis. The UNITY–ULTRA-xr is the ideal platform for labs requiring the flexibility to expand their capabilities to extended analyte ranges and varied sample types while maximising sample throughput.

Download product brochure! 


UNITY–ULTRA-xr Pro: Multi-tube thermal desorber with advanced re-collection options

UNITY–ULTRA-xr Pro™ is the highest capacity, automated thermal desorption system for the unattended sampling of up to 199 sample tubes in a single sequence. Its automated re-collection of tube and trap desorption split flows is unique to Markes and provides the most comprehensive re-collection options and enhanced sample security. It is ideal for laboratories needing to rapidly process large numbers of tube-based samples and take full advantage of the options for sample re-collection and automated re-analysis.

Download product brochure! 


Hydrogen certified thermal desorption for GC–MS

Choosing one of the new hydrogen-certified TD instruments protects your laboratory against future helium shortages and reduces running costs. Operating with hydrogen also increases sample throughput by as much as 50% while maintaining analytical performance. TD–GC–MS methods can be easily converted, and existing columns and consumables can be used, thus allowing fast adoption in busy laboratories.

Download product brochure! 


    Privacy disclaimer*
    Subscribe SRA Technical News:*
    I consentI do not consent
    Marketing activities:*
    I consentI do not consent
    Request information