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Elemental analyzers

SAVE TIME WITH VELP CONSUMABLES FOR ELEMENTAL ANALYZERS: HOW-TO VIDEOS MAKE IT EVEN EASIER

21/07/2021

Watch the tutorials! Learn about the VELP consumables for Elemental Analyzers and how easy it is to perform routine operations and maintenance.
SAVE TIME WITH VELP CONSUMABLES FOR ELEMENTAL ANALYZERS: HOW-TO VIDEOS MAKE IT EVEN EASIER
The Dumas method, also known as the combustion method, is a primary method for Nitrogen, N/Protein, and Carbon determination ensuring fast results, ease of use, and safety. Dumas technique is validated by different international organizations: AOAC, AACC, ISO, DIN, ASBC, AOCS, OIV, etc. 

The Dumas method is convenient in many aspects such as speed, safety, cleanliness, productivity, and cost per analysis. Since 2011 VELP has introduced N/protein and Carbon analyzers based upon this method along with dedicated consumables to optimize the analysis and ensure a maximized uptime of the analyzers.

How does the Dumas combustion method work?

Steps of the Dumas method - VELP NDA SeriesSteps of the Dumas method - VELP NDA Series
In a carrier gas flow (helium or argon), the sample contained in the tightly closed tin or silver foils is conveyed to the furnace with the combustion reactor where the combustion process, accelerated by catalysts, is performed rapidly at over 1000 °C with pure oxygen. This produces mostly water, carbon dioxide, and nitrogen as several oxides (NyOx).

This gas mixture passes through a reduction chamber equipped with the reduction reactor containing highly active copper powder heated to around 650 °C. This stage converts nitrogen oxides into elemental nitrogen and collects the oxygen in excess. The sample is then passed through traps that remove the residual water and carbon dioxide.

The quantitative determination of the nitrogen content is performed via a thermal conductivity detector (TCD). The measured signal from the thermal conductivity detector for the sample is then converted into total nitrogen content (%) by the software performing the calculation. EDTA, aspartic acid, acetanilide, urea, atropine, and other reagents can be used to create calibration curves in the elemental analyzer software in order to translate the signal received from the TCD in mgN. 

The use of various consumables is required to perform the combustion analysis and certain routine operations must be performed for the process to run smoothly.

Combustion Reactor for the efficient combustion stage of the Dumas analysis

Quartz or metallic combustion reactor ensuring versatility and performance. Ready for the addition of quartz wool, inert layer, and VELPcatalyst. Save time with the pre-packed combustion reactor in quartz, ideal for efficient routine operations on your elemental analyzer as it is ready to use.
 
HOW TO PREPARE THE COMBUSTION REACTOR HOW TO REPLACE THE COMBUSTION REACTOR
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Ash insert: proper collection of the ashes produced by the combustion

Ash inserts in quartz or ceramic are universally applicable and disposable. The metallic ash collector ensures resistance and reduces the cost per analysis as it is reusable and easily cleaned thanks to the dedicated accessory kit.
 
HOW TO PREPARE THE ASH INSERT HOW TO REPLACE THE ASH INSERT
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Reduction Reactor for the effective conversion of nitrogen oxides to elemental nitrogen

The reduction reactor in quartz is ready for the addition of quartz wool, copper oxide, and VcopperTM and ensures high visibility of these consumables consumption. Save time with the pre-packed version of the reduction reactor in quartz, ideal for efficient routine operations on your elemental analyzer as it is ready to use.
 
HOW TO PREPARE THE REDUCTION REACTOR HOW TO REPLACE THE REDUCTION REACTOR
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Water trap 2: Anhydrone leading to accurate detection

The chemical desiccant Anhydrone placed in Water trap 2 along with quartz wool is responsible for the final water absorption before the nitrogen detection performed by the TCD.
 
HOW TO PREPARE THE WATER TRAP 2 HOW TO REPLACE THE WATER TRAP 2
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