Laboratory equipment, VELP

DUMAS Nitrogen/Protein Analyzer

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TEMS™

NDA 701 works with the innovative TEMS™ benefits, the core technology that enables you huge saving in time, energy, money and space. Thanks to our constant research and development we reached great results.
Time Saving: Unparalleled productivity, results in only 3-4 minutes
Energy Saving: Excellent engineering, low consumption
Money Saving: Limited cost per analysis, less gas and reagent used (LoGas™ and DriStep™)
Space Saving: Just one slim unit required for the whole analysis
NDA 701 reduces manual operations, guaranteeing reliability, repeatability, durability and huge savings.

NDA 701 Working Process

Dumas method starts with an initial combustion to burn the sample, obtaining elemental compounds as water, oxygen, carbon dioxide and nitrogen as well. NDA removes the water in two separate points with two different kinds of trap: the first is positioned after the combustion and is a physical trap (DriStep™), while the second is placed after the reduction and it is a chemical trap. Between the two, the elemental substances passed through a reduction furnace, that eliminates oxygen and converts nitrogen oxide into elemental nitrogen. The second water trap removes the water remained (a very few quantity) and the gas reach the auto-regenerative CO2 adsorbers. After the CO2 removal, what remains of the gas is just nitrogen, that is detected by the LoGas™ innovative Thermal Conductivity Detector (TCD) without requiring a reference gas.

Accurate and Precise Analyses

Discover the reliability of the NDA 701, as shown by the very low detection limit (0.003 mg N) and the good RSD% (<0.5% with EDTA standard). Small quantities of sample (around 200 mg) give optimum results with minimum consumption. No need for higher quantities as the results will be the same.

Dumas vs. Kjeldahl

DUMAS

High Productivity -
Non-stop performance
Time Saving -
Few minutes required
Moderate Running Costs
Totally Unsupervised -
Fully automated process
Dry Chemestry -
No chemicals
Eco-friendly -
Less residues and wastes produced
Increasingly Used Method -
New technique, advanced instrument
RSD% -
< 0.5% (with yeast - 2.33% N)
Sample Homogenization -
0.5 mm particle size

KJELDAHL

Less Productivity -
Non-continuous operation
Time-consuming -
Analyses last hours
Affordable Equipment Cost
Partly Unsupervised -
Not entirely automated process
Wet Chemestry -
Uses chemicals
Costly Wastes Produced -
Residues must be disposed of
Worldwide Official Method -
Traditional technique, simple equipment
RSD% -
< 1% (with yeast - 2.28% N)
Sample Homogenization -
1 mm particle size