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Elemental analyzer vario EL cube
vario EL cube
CHNS elemental analyzer
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Unsurpassed performance and versatility in elemental analysis

Experience the gold standard in elemental analysis: the vario EL cube. This elemental analyzer stands for highest performance and versatility in elemental analysis. The vario EL cube is designed for simultaneous carbon, hydrogen, nitrogen, and sulfur analysis, offering additional options for the determination of oxygen, chlorine, and total inorganic carbon (TIC). From pharmaceuticals in the 100 microgram range to 20 milligrams of liquid fuels to 1.5 grams of soil samples – the vario EL cube will perfectly adjust to all your analytical needs in elemental analysis with highest precision and accuracy. Thanks to its low-maintenance design, the vario EL cube is optimized for unattended 24/7 operation and highest system uptime.

Highlights of the vario EL cube

Exceptional elemental concentration & sample size range

which covers 1 µg elemental concentrations,  40 mg C, and 1.5 g inorganic samples

Reliable, matrix-independent results

even for samples that are traditionally difficult to combust

Outstanding hydrogen and sulfur measurement capabilities

including simultaneous CHNS analysis even for sub-µg sulfur concentrations

High operating comfort

thanks to a high level of automation and low-maintenance design


Exceptional elemental concentration & sample size range

Even elemental concentrations in the µg range produce well-defined peak shapes thanks to our patented gas preconcentration technology as well as our highly sensitive detectors. The vario EL cube features three gas-specific adsorption columns. Each column traps and preconcentrates one gas (i.e., CO2, SO2, and H2O), while N2 travels directly to the detector. Gases are released from the columns only after the peak of the previous gas returns to baseline. This means that the vario EL cube dynamically adjusts to your specific sample and guarantees complete baseline separation of gases - even at extreme C:N and C:S elemental ratios of 12,000:1. In contrast to other micro elemental analyzers, the vario EL cube has unusually high upper elemental and sample size limits. It can analyze up to 20 mg of an organic substance such as liquid fuels and up to 1.5 g of inorganic samples such as soils - as long as the carbon content does not exceed 40 mg. Additionally, the vario EL cube can be upgraded for oxygen, chlorine, and total inorganic carbon (TIC) analysis.

Reliable results due to blank-free sample introduction and superior combustion

The vario EL cube guarantees a blank-free sample transfer thanks to our patented ball valve sample introduction, which is especially beneficial to trace nitrogen measurements. Furthermore, the jet-injection of oxygen aimed directly at the point of combustion and the high furnace temperatures of up to 1,200 °C ensure a complete conversion of the sample to measuring gas –  a prerequisite for highly precise, matrix-independent elemental analysis.

Outstanding hydrogen and sulfur measurement capabilities

To reliably deliver precise hydrogen and sulfur concentration measurements, the vario EL cube’s tubing is actively heated. This prevents the condensation of traces of water inside the system and thus the misquantification of hydrogen and sulfur. Furthermore, the vario EL cube can be outfitted with an infrared (IR) detector for trace sulfur analysis. In just a single analysis you can simultaneously collect CHN data with the thermal conductivity detector and sub-µg sulfur data with the IR detector.

High operating comfort thanks to a high level of automation and low-maintenance design

The vario EL cube can be equipped with a large autosampler with up to 120 positions that is reloadable at any position and time, enabling unattended 24/7 operation with highest sample throughput. Features like a fully automated leak check, a big ash finger, and a long-term stable calibration reduce maintenance tasks and times. This results in highest possible system uptime. Whenever maintenance is necessary, our user-friendly clamp connections ensure a tool-free maintenance experience, while the slide-out furnace gives easy access to all important parts and guarantees a comfortable working posture.

Future-proof thanks to 10 years guarantee

Thanks to the outstanding robustness and longevity of our vario EL cube, we grant a 10-year guarantee on the high-temperature combustion furnace and the thermal conductivity detector cell of the thermal conductivity detector (TCD). 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.

Product details

The vario EL cube is optimized for the analysis of: 

  • CHNS 
  • CHN 
  • CNS 
  • CN 
  • O* 
  • Cl* 
  • TIC* 

* optionally available

Weighing range

Large weighing range spanning from micro (<1 mg) to macro (1.5 g soil) sample weight and up to 20 mg of organic matter.

Element concentration range 

Largest dynamic range of element concentrations: 
C: Up to 40 mg absolute or 0 - 100 %
H: Up to 3 mg absolute or 0 - 100 %
N: Up to 15 mg absolute or 0 - 100 %
S: Up to 6 mg absolute or 0 - 100 %
O*: Up to 6 mg absolute or 0 - 100 %
Cl*: Up to 1.2 mg absolute or 0 - 100 %


< 0.1 % absolute (homogeneous substance), depending on sample type, analysis mode, and configuration

Analysis time 

~ 3-4 min per element, self-optimizing according to element content and sample weight. Depending on sample type, analysis mode, and configuration.

* optionally available

High-temperature combustion unit: 
Complete sample digestion at up to 1,200 °C (or 1,800 °C at the point of combustion when tin foil is used) with a ten-year furnace warranty. A jet injection of oxygen directly to the sample leads to the highest oxygen concentrations at the point of combustion, as well as low gas consumption. 100 % recovery is guaranteed even for samples, that are traditionally hard to combust.
Purge and trap chromatography: 
Separation of gaseous components on up to three gas-selective columns. These columns trap the gases until they are heated up. The release of a gas is only initiated, when the prior gas peak has reached baseline. This results in perfect peak separation without overlap, and automatic optimization of the analysis time.


  • Thermal Conductivity Detector (TCD)
  • Infrared (IR) Detector* for sulfur and oxygen
  • Electrochemical Detector* for chlorine

Sample introduction 

  • Integrated 60*, 80, or 120* positions autosampler (for solids and liquids in capsules), reloadable during analysis
  • Integrated 2 ml vial, 50 positions liquid autosampler with rinse and waste vial*, reloadable during analysis

Maximum furnace temperature 

1,200 ° C (whereby 1,800 °C is briefly reached at the combustion point when using tin foil)

Instrument control 

Windows® based vario EL cube operating software with LIMS integration and auto sleep and wake-up function for automated and unattended overnight operation. 21 CFR Part 11 functionality available.*

Required gases 

Helium or argon and oxygen


48 x 55 x 57 cm (W x D x H)

* optionally available

Electronic balance:

Balance and elemental analyzer form a system. We offer analytical balances from the leading manufacturers with our instruments. Please contact us for further information.

Sample former and pressing tools:

For simplified sample preparation, we offer a manual tool for compressing samples in tin foil or cups, and a mechanical press for the preparation of pellets with paper wrapping.

Capsule sealing press:

Tool for the exact dosing and gas-tight sealing of tin or silver capsules, for liquid and sensitive samples.


Product flyer
Flyer vario EL cube
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Elementar Product Portfolio Brochure
Elementar Product Portfolio Brochure
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Front page of the Application Note
Determination of carbon in soil, sediment, sludge and solid waste
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CHNS analysis in liquid fuels with the vario EL cube
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CHNS determination in coal and cokes according to JIS M 8819
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CHNS determination in soil and sediment using the vario EL cube with IR detector for low S content
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When to use an IR detector on the vario EL cube?
Front page of the Application Advice
EAS WETSORBER® & EAS WETSORBER® S filling and operating instructions
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Easy and accurate CHNOS elemental analysis of recycled oil
Red front page of a guide, containing GMP relevant information
GMP Guide
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Advanced Purge and Trap (APT) Technology
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Calibration of the IR-detector for low sulfur concentrations
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CHNS analysis of fluorinated samples
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Unique high precision chlorine analysis for a large concentration range
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