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NDA 702 Dumas Nitrogen Analyzer

Versatile and cloud-enabled elemental analyzer for Nitrogen and Protein determination according to the Dumas combustion method. Dual carrier gas: Helium and Argon.
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NDA 702 Dumas Nitrogen AnalyzerF30800080

The perfect solution to maximize your productivity

The perfect solution to maximize your productivity

NDA 702 Dumas elemental analyzer is the best solution for high throughput labs looking for a fast and safe analyzer with the possibility to choose between Helium and Argon as carrier gas. 

The NDA 702 is powered by the DUMASoftTM software and produces N/Protein results in just 3 to 4 minutes totally unsupervised and cloud-enabled. 
NDA 702 is dramatically faster, easier, and safer than a traditional Kjeldahl system. 

The NDA 702 is a safe analyzer that does not require aggressive chemicals or time-consuming analysis steps, just prepare your sample and walk away! 

Versatile analyzer for solid and liquid samples

Versatile analyzer for solid and liquid samples

With the NDA 702, you can load different matrices of solid, semi-solid, and liquid samples at the same time.

VELP NDA 702 elemental analyzer is designed to work 24/7, 365 days a year with fast and easy routine maintenance.

The electronic autosampler is supplied with a disc of 30 positions and can be expanded to accommodate up to 117 samples.

The lowest LOD in the market of  0.001 mgN with Helium and the RSD lower than 0.5% (EDTA) assure you high precision results and excellent reproducibility.  

Efficiency for your lab

Efficiency for your lab

NDA 702 analyzes samples of up to 1 g and reduces operating costs thanks to VELP engineering and genuine consumables with extended lifetime. Furthermore, NDA 702 allows cost reduction related to Helium availability thanks to the seamless choice of Argon. 

  • The NDA 702 LoGasTM TCD works with no reference gas ensuring accuracy and precision; 
  • Very low oxygen consumption thanks to optimized combustion;
  • The maintenance-free DriStepTM water trap is a physical trap that removes 99% of water, reducing the cost of chemicals;
  • NDA 702 is easy to install and is extremely compact saving valuable bench space in your lab
VELP TEMS technology drastically reduces wastes compared to wet chemistry N/protein determination methods. 

NDA 702 Nitrogen Analyzer Working Principle

NDA 702 Nitrogen Analyzer Working Principle

The Dumas method starts with the combustion of the sample which takes place inside the VELP combustion furnace (CF) at a temperature higher than 1000°C to obtain elemental compounds. 

Water separation is performed in 2 steps in the NDA 702. The first is the maintenance-free physical trap DriStep™ (WT1) strategically placed after combustion and the second is a chemical trap (WT2) that ensures the complete elimination of residual 1% of water.

Between the two traps, the flow of gases passes through the reduction furnace (RF) where NOX  compounds are transformed into molecular nitrogen N2.

Afterward, the CO2 is trapped by the unique self-regenerating VELP CO2 adsorbers

At this point, elemental nitrogen is detected by the innovative thermal conductivity detector TCD LoGas™ which will send the data to DumaSoftTM to calculate the amount of Nitrogen and Protein. 

DUMASoft™ Intuitive Operations

DUMASoft™ Intuitive Operations

We have designed the NDA 702 to ensure maximum ease of use with the DUMASoftTM intuitive User Interface. Control the instrument's status for the main window, at a glance. 

Setting up an analysis is extremely simple. The database and real-time graph are easily accessible and with the connection to a balance preparing a test is even faster. 

The DUMASoftTM contains an extensive library of preinstalled methods, multilingual support, and reporting functions with export to .csv, LIMS, and xls format.  

Create and manage calibration curves, assign a name, and always be ready to use the most suitable one.

Run the complete Leak Test and choose whether to run it on the whole circuit or targeted by zone, after replacing a consumable for example. 

The NDA 702 software can be upgraded with the optional 21 CFR Part 11 Package for Pharmaceutical, Cosmetic, and Food industry laboratories that require compliance with FDA regulations. 

Adding value to automation via the cloud

Adding value to automation via the cloud

NDA 702 thanks to its connectivity to VELP Ermes allows you to reduce routine operations thanks to the real-time monitoring of your elemental analyzer wherever you are, at any time. 

NDA 702 is designed for continuous work with fully automated processes, VELP Ermes allows you to manage multiple instruments, consumables, workflows and to drastically reduce diagnostic time to ensure a superior level of service with maximum data security and protection of your data.

Immediate notifications and alerts will allow you to be always informed about the status of your analysis and thanks to the remote interruption you will have total control of your processes ensuring maximum security.

Access the database of your instrument in total security through the VELP Ermes platform and work with your colleagues creating and sharing reports from PC, smartphone and tablet.  

Tecnologia TEMS™

Save Time, Energy, Money and SpaceSave Time, Energy, Money and Space
NDA 702 Elemental Analyzer works with the innovative TEMS™ benefits, for unmatched savings.

Time Saving: rapid heating reduces wasted time
Energy Saving: limited energy consumption thus cutting CO2 emissions
Money Saving: cost reduction for each analysis
Space Saving: the narrow footprint saves valuable laboratory bench space


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Consumables and accessories for NDA 702

Consumables and accessories for NDA 702

Using original VELP consumables will maximize the performance of the NDA 702 and with VELP accessories your daily work will be easier and faster. 
  • Receive everything you need with a single code with 1000, 2000 and 4000 analysis  kit;
  • Quartz and metal reactors and pre-packaged reactors; 
  • Ash inserts in 3 different materials to meet all application needs; 
  • The innovative VcopperTM to increase the life and efficiency of the reduction reactor; 
  • Superabsorbent Powder to easily manage the preparation of liquid samples; 
  • and much more...
21 CFR part 11 package for Elemental Analyzers
cod. A00000455
Anhydrone, 454g
cod. A00000225
Ceramic ash collector with bottom
cod. A00000198
Cleaning kit for metallic ash collector
cod. A00000353
Closing device tin foil cup
cod. A00000217
Copper oxide, 50g
cod. A00000157
Disc 2 for autosampler
cod. A00000199
Disc 3 for autosampler
cod. A00000200
Disc 4 for autosampler
cod. A00000201
EDTA Certified, 100 gr
cod. A00000149
High temperature sealing grease
cod. A00000236
IQ/OQ/PQ NDA 702 Manual
cod. A00000192
Kit approximately 1000 analyses for NDA - CN
cod. A00000194
Kit approximately 2000 analyses for NDA - CN
cod. A00000270
Kit approximately 4000 analyses for NDA - CN
cod. A00000271
Kit for TOC/sample preparation
cod. TA00000378
Metal reactor tube
cod. A00000321
Metallic ash collector
cod. A00000322
Mold for tin foils 50x50mm
cod. A00000262
Oat meal, 30g
cod. A00000318
cod. 40002951
cod. 40002950
Pre-packed combustion reactor
cod. A00000158
Pre-packed reduction reactor
cod. A00000226
Quartz ash collector
cod. A00000161
Quartz reactor tube
cod. A00000162
Quartz wool, 50 g
cod. A00000154
Silver foil 35x35 mm, 100 pcs
cod. A00000371
Super-Absorbent Powder, 10 g
cod. A00000317
Tin Cups 6x18mm, 100 pcs
cod. A00000482
Tin Cups 8x22mm, 100 pcs
cod. A00000483
Tin Foil Cups, 150 pcs
cod. A00000153
Tin foils 50x50 mm, 450 pcs
cod. A00000260
Vcopper High Reduction Efficiency, 470 g
cod. A00000240
VELP Ermes 1 year Connection
cod. E00010012
VELP Ermes 3 years Connection
cod. E00010036
Velpcatalyst with inert layer, 36 g
cod. A00000320


Method of analysis: Nitrogen determination according to Dumas method (combustion)
Duration of analysis: 3/4 minutes
Detector: Innovative TCD autocalibrating
Sample weight: max 1g
Autosampler capacity: up to 4 discs, 30 positions each
Reproducibility (RSD): < 0.5% for EDTA standards (9.57%N)
Recovery: > 99.5%
Carrier gas: Helium or Argon
Detection limit: 0.001 mg N, with Helium
0.01 mg N, with Argon
Carrier gas (He/Ar): purity 99.999% (grade 5.0)
Oxygen (O2): purity 99.999% (grade 5.0)
Compressed air or Nitrogen (N2): purity 99.6 % (oil and water free)
Carrier gas (He/Ar) pressure: 2 bar
Oxygen (O2) pressure: 2 bar
Connectivity Cloud via LAN or Wi-Fi
Interfaces: USB; RS232
Power: 1400 W
Power supply: 230 V / 50 - 60 Hz
Weight: 54 kg / 119 lb
Dimensions (WxHxD): 655x510x410 mm (H 690 mm with autosampler)
25.8x20.1x16.1 in (H 27.0 in with autosampler)

Brochures & Leaflets

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Application notes

Choose among a comprehensive library of Application Notes / White Papers and learn more on how to optimize the performance of your VELP instruments. These documents offer typical analyses of well-known samples, together with official references and suggestions, to make you an expert!


Our compliance to statutory rules and regulations worldwide.
With the CE mark, VELP Scientifica declares that the products are designed and manufactured in compliance with the essential safety requirements of the European Directive on Safety.
The Certification Body (CB) Certificate is an international program created by the IECEE for the acceptance of product safety test results among participating laboratories and certification organizations around the world.
The cNEMKOus mark ensures this product is designed and manufactured in compliance with the International Directive on Safety IEC/EN 61010-1. The cNEMKOus mark has the same legal status as any other NRTL/SCC accredited marks, for U.S. and Canada.
Service offering
Close to our customers: we are committed to supporting you anytime, anywhere
Check technical sheets with answers to most frequently asked questions
How frequently do I need to check my calibration curve?
Since the accuracy of the calibration curve strictly depends on the TCD, it can be used for several months. It is suggested to periodically verify its precision and if necessary, determine the correction factor.
What are the drivers of Oxygen and gas consumption?
Oxygen and carrier gases consumption depends on the daily use of the instrument and the method applied to perform the analysis. The software feature “help/computation” estimates the consumption of both Helium and Argon by considering the method and the number of analyses per day.
How can I choose the right ash collector?
From an analytical point of view, the ash collector material does not impact the result of the analysis.

The choice depends on the sample matrix or on the preparation step:
- Quartz ash collector is suitable for almost all types of samples
- Ceramic ash collector is suitable for the majority of samples, except those with complex matrix (high percentage of fats or carbohydrates)
- Metal ash collector is suitable for the majority of samples, except samples prepared with acids (samples: NCN - NPN - TOC). Metal ash collectors are a reusable and cost-effective solution.
Are the Dumas combustion and the Kjeldahl method giving different results?
The Kjeldahl method gives as a result of the analysis the Total Kjeldahl Nitrogen (TKN), while the Dumas combustion method gives as result the Total Nitrogen (TN).

You can find additional information by clicking here
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