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CN 802 Carbon Nitrogen Elemental Analyzer

Fast, versatile, cloud-enabled elemental analyzer for Carbon and Nitrogen determination on organic matrices with Helium and Argon as carrier gas. 
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CN 802F30800090

Fast and simultaneous Carbon Nitrogen analyses

Fast and simultaneous Carbon Nitrogen analyses

The CN 802 a robust and flexible combustion analyzer, that works in accordance with official reference methods for the determination of carbon and nitrogen in many industrial sectors such as agriculture, environmental, food & feed and chemical.

The CN 802 is powered by the CNSoftTM software and produces unsupervised, simultaneous results in 5 minutes, totally unsupervised of: 

  • Total Carbon - TC
  • Total Organic and Inorganic Carbon (after acidification) - TOC, TIC
  • Total Nitrogen - TN
  • C/N Ratio 

The CN 802 is a safe analyzer that does not require aggressive chemicals or time-consuming analysis steps. Just prepare your sample and walk away! 

Versatile and sensitive

Versatile and sensitive

With the CN 802 you can load different matrix of solid, semi-solid and liquid samples at the same time.

Carbon detection from ppm - 150 mgC, the lowest Nitrogen 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.  

VELP CN 802 elemental analyzer is designed to work 24/7, 365 days a year with fast and easy routine maintenance.

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


Efficiency for your lab

Efficiency for your lab

CN 802 analyzes samples of up to 1 g and reduces operating costs thanks to VELP engineering and genuine consumables with extended lifetime. Furthermore, CN 802 allows cost reduction related to Helium availability thanks to the seamless choice of Argon. 

  • The selective Non-Dispersive Infrared NDIR detector is maintenance-free and reads only Carbon content;
  • The CN 802 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;
  • CN 802 is easy to install and extremely compact saving valuable bench space in your lab

VELP TEMS technology drastically reduces wastes compared to wet chemistry N/protein determination methods. 

CN 802 Working Process

CN 802 Working Process

The sample is purged with carrier and drops down into the combustion reactor where it is converted in its elemental compounds at a high temperature (>1000°C). 

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

The combination of high temperature and the exclusive VcopperTM reduces nitrogen dioxide to molecular nitrogen inside the reduction furnace. 

The VELP NDIR detector precisely detects Carbon concentration with an excellent limit of detection.

The auto-regenerative CO2 absorbers trap carbon dioxide in order for the exclusive TCD (Thermal Conductivity Detector) to detect the Nitrogen content.


Intuitive interactions with CNSoft™

Intuitive interactions with CNSoft™

The CNSoft™ software is the powerful VELP solution that controls and operates the CN 802 analyzer.

The CNSoft™ comes with a user-friendly interface that displays all relevant information at a glance: results, database and instrument conditions.

It is possible to choose from a rich library of pre-installed methods and create customized ones. An easy calibration curve creation for Carbon and Nitrogen allows for testing of any sample matrix with no memory effect.

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.  

Adding value to automation via the cloud

Adding value to automation via the cloud

CN 802 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. 

CN 802 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.  

TEMS™ Technology

Save Time, Energy, Money and SpaceSave Time, Energy, Money and Space


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Specific Accessories for High Flexibility

Specific Accessories for High Flexibility
CN 802 is equipped with numerous accessories designed to simplify the operation.
A specific device simplifies the sample preparation for liquids; spatulas and syringes ensure correct transfer of the sample into the capsules.
VELP Scientifica main consumables ensure premium performance, as both the analyzer and the consumables come from the same source.


Method of analysis: Cabon/Nitrogen determination according to combustion method
Duration of analysis: 4/5 minutes 
Detector: N= TCD (Thermal Conductivity Detector)
C= NDIR Detector (Non Dispersive Infrared)
Sample weight: Up to 1g
Autosampler capacity: up to 4 discs, 30 positions each (up to 117 samples)
Reproducibility (RSD): < 0.5% for EDTA standards approx. 100 mg
Recovery: > 99.5%
Detection Range C: ppm - 150 mgC
Detection Range N: ppm - 200 mgN
Carrier gas: Helium or Argon
Nitrogen Detection limit (Absolute values): 0.001 mg N, with Helium
0.01 mg N, with Argon
Carbon Detection limit (Absolute values): 0.01 mgC
Combustion temperature: 1030 °C / 1886°F
Carrier gas (He/Ar): purity 99.999% (grade 5.0)
Oxygen (O2): purity 99.999% (grade 5.0)
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

VELP Scientifica invites you to download brochures and leaflets in order to explore our premium quality solutions and to have all the major key arguments, features and specifications of a product in your hands, in any place, and at any time.

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
Can I determine the TOC with the CN 802?
To determine TOC, you must proceed with the acidification of the sample before analyzing it with the CN 802.

The plate for TOC (TA00000378) and silver foils (code A00000371) are developed to support you in these analyses.
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.
Which consumables are suggested for laboratories analyzing acidic samples?
 When there is an acidic sample, use silver foil and quartz consumables.
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.
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