VELP's NDA 702 Dumas Nitrogen Detergent is an optimal solution to maximize nitrogen and protein determination efficiency according to Dumas combustion method.

• Ultra-high sensitivity, ultra-low detection limit: NDA 702 has extremely low detection limit on the market: 0.001mgN, RSD below 0.5% (EDTA), ensuring high-precision results and excellent reproducibility;

• No reference gas path is required, saving 50% gas;

• Regenerative adsorption traps, replacement-free and maintenance-free: NDA 702 is equipped with a physical trap and renewable adsorption traps, which automatically remove moisture and carbon dioxide, without replacement of consumables and maintenance-free.

NDA 702 Workflow

NDA 702/CN802 – Automatic Sampler

Electric sample injector

• Standard configuration: 1 30-bit sample plate

• Maximum injection number: 117 samples (3 additional injection trays)

NDA 702/CN 802 Automatic sampler transfers the sample to the combustion furnace through the following steps:

• The purge chamber is filled with carrier gas

• Oxygen enters the combustion tube

• The effect of gravity passing through the sample enters the combustion chamber

• Overall, the sample falls into the purge chamber, pops up and enters the combustion chamber, and the injection system is closed

Burning furnace

In order to fully burn the organic sample, high temperatures are necessary, generally higher than 900°C.NDA/CN combustion furnace:

• Maximum temperature: 1100 °C

• Reliable

• Safety

• Long service life

• Less maintenance

VELP reaction tube

Reaction tubes are used for combustion and reduction.Two materials: quartz and metal.

Combustion reaction tube

Combustion in an oxygen-rich environment converts organic samples into their elemental compounds:O₂, N₂, no_X, co₂, H₂O, co, so₃…

The combustion reaction tube is prepared or prefilled reaction tube is selected as follows (code A0000158)

Combustion tube – Ash collection

The ash produced by the combustion is collected in a dedicated ash collection tube.Start-Up KIT contains three versions to select the best version based on customer needs

Metal ash collection tube

• Reusable 5/6 times (600/700 analysis)*

• The cost per sample is lower

• Excellent high temperature resistance and damage resistance

• Cleaning kits are used as accessories for daily maintenance and have a longer service life

High-strength samples - Save tube life

Salt (halogen)-containing samples such as sausage, soy sauce, plants and soil can corrode the metal tubes.This is due to the formation of HCl corroding the metal parts.When using such samples, it is essential to regularly clean pipes and other metal parts, as corrosion can reduce the life of metal consumables.How to do it?

• Minimize sample volume

• If possible, 2 pipes are constantly cleaned alternately

Restore tube

Reducer - vcopper™

The gas passes through a reduction furnace, in which: nitrogen oxide is reduced to N₂Molecules, CO is converted into CO₂.

Vcopper reducing agents provide unique properties in the following aspects:

• Lifespan: up to 750* analysis;

• Convenience: frees users from tedious work, and replaces consumables, etc. very fast.

Pre-installed reaction tubes (quartz only) are available.

H₂O separation

The VELP NDA and CN series have two water removal units: WT1 DriStep and WT2.

WT1 D-Day step

• This physical water removal unit is a VELP-specific water removal unit located between the combustion furnace and the reduction furnace;

• 99% moisture is removed at this step;

• Maintenance-free, reducing cost of individual samples and reducing reducing agent consumption.

WT2

• Chemical desiccant, easy to obtain.

co₂Separation

VELP element analyzer uses unique trap regeneration technology.Specific absorbents, microporous materials, continuously perform the adsorption and desorption of carbon dioxide to achieve its own regeneration.The A/B cavity operates alternately.

CN802 infrared detector

VELP-specific (non-dispersive infrared) NDIR detectors can read the carbon dioxide content and send information to CNSoft.Only the wavelength of CO2 is read: 4.3μm.

• Selective detector

• High accuracy and precision

• Read only C content

• Maintenance-free

• LOD: 0.01 mg C (absolute value)

• Maximum C content: 150mg (absolute value)

TCD (thermal conductivity detector) detects elemental nitrogen N2.The data is sent to the PC and recorded through software.VELP LoGas TCD delivers excellent performance.

• NDA 702/CN802 – Element LOD

• he: 0,001 Buy N

• AR: 0,01 Buy N

• Low gas consumption, save 50% immediately

• Excellent reliability

• Extra long service life

• All useful information in one window

• Create, save and call databases (.xls, .csv, .txt, .pdf, etc.)

• Customized test reports

• Create and manage different calibration curves

• Different nitrogen standards can be used

• Recalculate and reintegrate functions

• Results can be found in different measuring units

• The method library is suitable for many types of samples to minimize analysis costs

• Automatic leak testing for complete system

• Daily control and maintenance

• Real-time check of instrument status

• Repeatability (RSD): <0.5% for EDTA standard (9.57% N)

• Recovery rate: > 99.5% N

• Detection limit: 0.001 mg N absolute (He); 0.01 mg N (Ar)

• Required gases: helium, purity 99.999% (grade 5.0); argon, purity 99.999% (grade 5.0); oxygen, purity 99.999% (grade 5.0)

NDA 702

CNSOFT calibration

• Multi/single point calibration

• Calibrate C and N parameters

• Create and manage different calibration curves

• Specify the name function of the calibration curve

• Manage different standard curves

• Recalculate and reintegrate functions

NSOFT analysis results

Data from IR and TCD sensors arrive at powerful CNSoft, providing advanced performance:

• All useful information in one window

• Automatic calculation of C/N ratio

• Complete library of pre-installation methods

• Create, save and call databases (.xml, .csv, .txt, etc.)

• Create and export test reports in multiple formats (LIMS, pdf, csv, txt,…)

• Leak Test Management (by area or complete)

• Select one or more analyses to allow CNSoftTM to display all relevant peaks.

• Click the Carbon or Nitrogen Peak box to open it in full window mode

Origin: Italy VELP