Vario ISOTOPE Select

The workhorse in elemental analyzer isotope ratio analysis


Meet the workhorse in elemental analyzer isotope ratio analysis (EA-IRMS): the vario ISOTOPE select. This elemental analyzer inlet combines reliable results with outstanding robustness. The vario ISOTOPE select is designed for simultaneous carbon, nitrogen, and sulfur isotope ratio analysis in samples with weights of up to 300 mg. Analysis results with highest precision and accuracy are guaranteed thanks to highly efficient gas preconcentration and peak separation. The analyzer also offers the option for δ2H determination of water and convinces with highest system uptime thanks to its low-maintenance design. In combination with one of our state-of-the-art IRMS systems, you will always get the best out of your analyses.


Highlights of the vario ISOTOPE select


Excellent peak shapes and separation with simultaneous NCS analysis

for analysis of very low sulfur contents in high carbon samples (e.g. tree rings)


Low-level δ15N analysis


made possible through our zero-blank sample introduction system

High operating comfort

thanks to a high level of automation and low maintenance

240-position autosampler

for maximum throughput of microsamples




Excellent peak shapes and separation thanks to Temperature Programmed Desorption (TPD)

The vario ISOTOPE select delivers excellent peak shapes and full peak separation in simultaneous NCS analysis mode in less than nine minutes. This is achieved thanks to our patented Temperature Programmed Desorption (TPD) technology, which separates combustion gases using dynamic – not preprogrammed – heating. Because the individual target gases are only released, once the prior sample peak has reached baseline, complete peak separation is guaranteed even for extreme elemental ratios. Additionally, our TPD technology releases gases in a highly rapid and therefore focused manner, resulting in high signal-to-noise-ratios. Together with a high furnace temperature of up to 1,200 °C and jet-injection of oxygen to the point of combustion, our TPD technology provides outstanding accuracy and sensitivity. This enables the detection of very low sulfur contents even in a high carbon sample matrix (such as tree rings), making it the ideal instrument for NCS isotope analysis.


Low-level δ15N analysis thanks to zero-blank sample introduction

Thanks to a zero-blank sample introduction, reliable low-level δ15N analysis is possible with the vario ISOTOPE select. Additionally, the jet-injection of oxygen directly at the sample assures complete combustion efficiency at lowest oxygen consumption for matrix-independent results, even for samples that are traditionally difficult to combust. In conjunction with a state-of-the-art thermal conductivity detector, the analyzer provides an elemental detection limit of < 100 ppm.



High operating comfort through design

The vario ISOTOPE select features a big ash finger as well as separate combustion and reduction tubes, which results in extremely low maintenance and highest system uptime. Whenever maintenance is necessary though, our user-friendly clamp connections ensure a tool-free experience, while the slide-out furnace guarantees easy accessibility and a comfortable working posture.


240 position autosampler for maximum sample throughput

Equipped with a 120 or 240 position autosampler, the vario ISOTOPE select is designed for unattended 24/7 analysis and high sample throughput. The autosampler is reloadable at any time – even when an analysis is being conducted.

Future-proof thanks to 10 years warranty

Thanks to the outstanding robustness and longevity of our vario ISOTOPE select, we grant a 10-year warranty on the high-temperature combustion furnace and the thermal conductivity detector. With our long-term oriented dedication to technical support, we provide spare parts for a minimum of 10 years. This results in outstanding low total cost of ownership, giving you confidence in return of investment.


Download: Flyer-vario-ISOTOPE-select-EN


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