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628 Series

Carbon/Hydrogen/Nitrogen Determinator

By incorporating state-of-the-art hardware and software technology with key improvements in overall instrument performance and reliability the 628 Series makes it possible to achieve fast results in organic matrices from food to fuels. Our software is designed for seamless interaction with any operator or customer environment, with virtually unlimited storage space and compatibility with various Laboratory Information Management Systems (LIMS). It also supports compliance to FDA regulations 21 CFR Part 11 for a closed analytical system

  • Rapid analysis times of 3.5 to 4.5 minutes with extended reagent lifetimes provides maximum throughput while maintaining a low cost-per-analysis.
  • Unique combustion gas handling and aliquot dosing system eliminate the need for costly whole gas analyses.
  • Simple, gravity-fed autoloader option allows for unattended analysis with capacity for up to 120 samples.
  • Dual-stage furnace system operates at temperatures up to 1050°C using only pure oxygen to ensure the complete combustion of all organic samples.
  • Reagent and reduction tubes located on front side of instrument behind a cabinet door for safety and convenience.

The CHN628 Series Elemental Determinator is used to determine nitrogen, carbon/nitrogen, and carbon/hydrogen/nitrogen in organic matrices. The instrument utilizes a combustion technique and provides a result within 4.5 minutes for all the elements being determined. The instrument features custom software operated through an external PC to control the system operation and data management.

A pre-weighed and encapsulated sample is placed in the instrument's loader where the sample will be transferred to the instrument's purge chamber directly above the furnace, eliminating the atmospheric gases from the transfer process. The sample is then introduced to the primary furnace containing only pure oxygen, resulting in a rapid and complete combustion (oxidation) of the sample. Carbon, hydrogen, and nitrogen present in the sample are oxidized to carbon dioxide (CO2), water (H2O), and NOx respectively, and are swept by the oxygen carrier through a secondary furnace for further oxidation and particulate removal. In the FP and CN628 models, the combustion gases pass through a pre-cooler and thermoelectric cooler to remove the water vapor. The combination gases are then collected for equilibration in a vessel known as a ballast. The homogenized gases from the ballast are swept through an aliquot loop and then passed into a carrier gas stream. Separate optimized non-dispersive infrared (NDIR) cells are utilized for the detection of H2O and CO2 ensuring the rapid analysis time of the system. The NOx gases are carried through a reduction tube filled with copper to reduce the gases to N2 and remove any excess oxygen present from the combustion process. The aliquot gas then passes through Lecosorb and Anhydrone to remove CO2 and the water generated during the CO2 trapping process and onto a thermal conductivity cell (TC) utilized to detect the N2.

The final results are typically displayed in weight percent or parts-per-million but can be displayed in other custom units or conversions such as percent total protein, moisture corrected, and others.


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628 Series Details


  • Models
    1. CHN628 Carbon/Hydrogen/Nitrogen

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