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VELP

NDA 702 Dumas Nitrogen Analyzer

Reference: VEL-F30800080

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Built to maximize your productivity


The NDA 702 Dumas elemental analyzer suits high-throughput labs that need a fast, safe analyzer, with a choice of helium or argon as carrier gas.


Powered by DUMASoft™ software, the NDA 702 produces N/protein results in just 3 to 4 minutes, fully unsupervised and cloud-enabled.


The NDA 702 is much faster, easier and safer than a traditional Kjeldahl system.


It is a safe analyzer that needs no aggressive chemicals or time-consuming steps: just prepare your sample and walk away.


NDA 702 Nitrogen Analyzer Working Principle

VELP NDA 702 Nitrogen Analyzer Working Principle

The Dumas method begins with combustion of the sample in the VELP combustion furnace (CF), above 1000 °C, to obtain elemental compounds.


Water is separated in two steps: first the maintenance-free physical trap DriStep™ (WT1) placed right after combustion, then a chemical trap (WT2) that removes the remaining 1% of water.


Between the two traps, the gas flow passes through the reduction furnace (RF), where NOx compounds are converted into molecular nitrogen (N2).


The CO2 is then trapped by the self-regenerating VELP CO2 adsorbers.


Finally, elemental nitrogen is detected by the TCD LoGas™ thermal conductivity detector, which sends the data to DUMASoft™ to calculate nitrogen and protein content.


Elemental Analysis and the Dumas Method

The Dumas method (combustion method) is a primary method for determining nitrogen and protein, offering fast results, ease of use and safety. It is considered an alternative to the classical Kjeldahl method. Both are validated by international bodies: Kjeldahl is recognized by AOAC, EPA, DIN, ISO and others, and Dumas by AOAC, AACC, ISO, DIN, ASBC, AOCS, OIV and others. In some countries, local guidelines recommend one method over the other.

The Dumas method for nitrogen determination (1831) is older than Kjeldahl (1883) but more convenient in many ways: speed, safety, cleanliness, productivity and cost per analysis.

In the past, the conditions the Dumas method requires were hard to reproduce, so Kjeldahl took the lead and became the classical method for nitrogen/protein determination.

Today, thanks to technological progress, Dumas nitrogen determination is becoming more widespread.


    This combination does not exist.

    NDA 702 Dumas Nitrogen Analyzer

    Technical information

    Method of analysis:

    Nitrogen determination according to Dumas method (combustion)

    Analysis time:

    3/4 minutes

    Detector:

    TCD (Thermal Conductivity Detector)

    Sample weight:

    Up to 1 g

    Autosampler type:

    Electronic

    Autosampler capacity:

    Up to 4 discs, 30 positions each (up to 117 samples)

    Detection range N:

    ppm up to 200 mg abs. (or 100 %)

    Reproducibility (RSD):

    < 0.5% for EDTA standards (9.57%N)

    Recovery:

    > 99.5%

    Combustion temperature:

    1100 °C / 2012 °F

    Carrier gas:

    Helium or Argon (grade 5.0)

    Combustion gas:

    Oxygen (grade 5.0)

    Connectivity

    Ermes Cloud Platform via Wi-Fi or LAN connected to a PC

    Interfaces:

    USB; RS232

    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)

    21 CFR part 11 compliance:

    Yes, optional package available

    Official references:

    ISO 16634; ISO 14891; AOCS Ba 4e-93, AOAC 992.23; AACC 46-30; ICC 167, ASBC Barley 7C; AOCS Ba 4f-00; AOAC 992.15; ASBC AOAC 997.09; OIV-MA-AS323-02A; AOAC 990.03; AOAC 993.13; ISO 13878; EN 16168, etc.


    Related documents

    DOCUMENT NAME

    RELEASE DATE

    DOWNLOAD

    VELP-Bochure-NDA702
    23 / 12 / 2024
    Download icon Download

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