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828 Series 

Carbon/Nitrogen/Protein Determinator

By incorporating state-of-the-art hardware and an on-board, touch-screen software platform, the 828 Series allows you to easily handle a wide range of sample applications. The core capabilities and performance of previous generations of LECO macro combustion instruments have been maintained, while key improvements have been made in throughput, uptime, and reliability. Macro sample mass capability paired with cycle times as fast as 2.8 minutes make the 828 an ideal instrument for a diverse applications base, while delivering unparalleled sample analysis throughput.

  • Maximize laboratory productivity with unmatched sample throughput
  • Rapid cycle time of 2.8 minutes for added productivity
  • Extended reagent lifetimes optimize instrument up-time
  • Easy access to common maintenance areas reduces downtime and time required for routine maintenance.
  • Rugged 30-sample autoloader with optional expanded capacity for up to 120 samples maximizes lab efficiency.
  • Ergonomic, operator-centered design with boom-mounted touch-screen interface
  • Expanded furnace efficiency and reliability with a regent-free design


The 828 series is ideal for the following applications: Feeds, Pet Foods, Grains and Cereals, Milled Products, Fermentation Products, Dairy Whey and Cheese Products, Soils, Sediments, Fertilizers, Plant Tissue, Waste Materials, and Resins and Polymers

The 828 Series determines nitrogen/protein or carbon/nitrogen in a multitude of organic matrices from food and feeds to soils and fertilizers. The system utilizes a combustion technique with a vertical quartz furnace designed to handle diverse sample matrices with rapid cycle times and extended reagent lifetimes, delivering unsurpassed throughput coupled with superior instrument uptime.

To begin an analysis, the sample is weighed into a tin capsule or encapsulated within tin foil and placed into the loader. A fully automated analysis sequence transfers the sample to a sealed purge chamber, where atmospheric gas is removed. The purged sample is transferred automatically into a reticulated ceramic crucible within the furnace. To ensure complete and rapid combustion (oxidation) of the sample, the furnace environment is composed of pure oxygen with a secondary oxygen flow being directed to the sample within a reticulated crucible via a quartz lance. The combustion gases are swept from the furnace through a thermoelectric cooler to remove moisture, and are collected in a thermostatically controlled ballast volume. The gases equilibrate and mix within the ballast before a representative aliquot of the gas is extracted and introduced into a flowing stream of inert gas for analysis. Depending upon the analyzer model, the aliquot gas is carried to a non-dispersive infrared (NDIR) cell for the detection of carbon (as carbon dioxide) and a thermal conductivity cell (TC) to detect nitrogen (N2). Unlike NDIR cells, TC cells are chemically non-specific, so a series of reagents and scrubbers are used to ensure quantitative detection of N2 without chemical interference. A heated reduction tube, filled with copper, is used to convert nitrogen oxide species (NOX) to N2 and to remove excess oxygen. Carbon dioxide (CO2) is removed by LECOSORB and water (H2O) is removed by Anhydrone.

Careful sequencing of the analysis by Cornerstone® brand software provides maximum sample throughput by interleaving the sample loading sequence with quantitation of the aliquot gases from the previous sample. The determined composition of the sample is displayed in weight percent or parts-per-million, and can also be displayed in other custom units
if preferred.

Many diagnostic sensing capabilities are included in the 828 Series analyzer. Multiple Pressure Transducers (PT) have been included to provide the ability to leak check individual segments of the flow path. Digital Mass Flow Controllers (MFC's) are used to control and measure critical gas flows. Thermal sensors and heaters are used to thermostatically control the temperature of critical components such as the furnace, the ballast, the dose loop, the MFC, the NDIR cell, and the TC cell.


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828 Series Details


  • Models
    1. FP828 Nitrogen/Protein

    1. FP828P Nitrogen/Protein Performance Package

    1. CN828 Carbon/Nitrogen

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