836 Series Oxygen/Nitrogen/Hydrogen by Inert Gas Fusion


Touch interface

Cornerstone software with touch interface enables complete access to instrument operation and safe valuable bench space.

Cornerstone Mobile

LECO Cornerstone Mobile Application

Option provides access to data, plots, and instrument status from your smart phone, tablet, or desktop computer


Available autocleaner minimizes the need for manual cleaning between analyses

Automated Sample Loader

Optional 20-position sample loader provide unattended operation


The ONH836 Oxygen/Nitrogen/Hydrogen Elemental Analyser is designed for wide-range measurement of oxygen, nitrogen, and hydrogen content of inorganic materials, ferrous and non-ferrous alloys, and refractory materials using the inert gas fusion technique.

The instrument features a custom MS Windows®-based software interface designed specifically for touch-screen operation. Developed by combining long-term research with customer feedback, this easy-to-use software gives you complete access to instrument control, analysis settings, diagnostics, reporting, and more—without sacrificing valuable bench space.


Long term results stability

  • Measurement range from sub-ppm to % levels
  • Complete gas characterization in expanded range
  • Oxygen determination with both CO2 and CO detectors
  • Novel electrode design increases heat transfer efficiency
  • Thermostatic detector design with built-in drift compensation circuitry

High throughput

  •   Analysis time 100 seconds
  •   Optional auto cleaner minimize need for cleaning between analysis
  •   Optional 20 position sample loader for automation
  •   Jam Free Sample Drop
  •   High efficiency cooling

Convenient operation

  •   Ergonomic and intuitive software
  •   Built in vacuum cleaner keeps working area clean
  •   Automated diagnostic and segmented leak check
  •   Built-in gas dose system for easy calibration

Versatile test methods

  • Furnace control by voltage, current or temperature
  • Argon or helium as carrier gas
  • Flexible data export features
  • Customized reporting


Samples dropped into the hot crucible fuse (melt) and release forms of oxygen, nitrogen and hydrogen Oxygen species react with hot graphite to form carbon monoxide (CO) and carbon dioxide (CO2) Nitrogen species form elemental nitrogen (N2) Hydrogen species are released as hydrogen gas (H2) Gases are swept out of the crucible by an inert carrier gas flow (helium or argon) The gases flow through a heated reagent oxidizing CO to CO2 and H2 to H20 Hydrogen is measured as H2O by NDIR cell. For Oxygen determination the instrument measures separately its contribution in form of CO and twice as CO2 before and after conversion. Therefore, it  allows very accurate O2 determination in full range. After scrubbing out H2O and CO2 from the flow, the DFC compensates for the loss with carrier gas and Nitrogen is measured as N2 by TC detector

Features and benefits:

  • Integral Sample Loading Area minimizes atmospheric contamination during sample introduction  and simplifies routine sample drop mechanism maintenance
  • New quick-change disk filter assembly
  • Removable vacuum line for work surface cleaning
  • Instrument calibration (single or multi-point) by reference standards or built-in gas dose
  • Pressure-compensated and temperature-controlled gas dose system
  • Novel flowpath plumbing minimizes connections to make/break/leak


LECO’s versatile instrumentation can be used to perform a wide range of applications. Please find below a selection of application notes for the most popular applications. Contact our sales and application specialists for more details.

TC600/TCH600 Oxygen and Nitrogen Determination in Ferroalloys

Oxygen and Nitrogen Determination is shown with an electrode furnace in ferroalloysLearn more...

Oxygen and Hydrogen Determination in Titanium Hydride

Titanium hydride is used in place of titanium powder as the production process is less costly and produces products with comparable mechanical properties. Ref: 203-821-475Learn more...

Oxygen Determination in Aluminum

Oxygen Determination in Aluminium by LECO ONH836. Ref: 203-821-459Learn more...

Titanium Hydride

Oxygen and Hydrogen Determination in Titanium Hydride by LECO ONH836. Ref: 203-821-458Learn more...

Copper and Copper Alloys

Oxygen and Hydrogen in Copper and Copper Alloys. Ref: 203-821-455Learn more...

Refractory metals, Titanium Alloys

Hydrogen in Reactive and Refractory Metals. Ref: 203-821-456Learn more...

Refractory metals

Oxygen, Nitrogen, and Hydrogen in Refractory MetalsLearn more...

Nickel-Base, Cobalt-Base Alloys

Oxygen, Nitrogen, and Hydrogen in Iron, Steel, Nickel-Base, and Cobalt-Base AlloysLearn more...


Oxygen/Nitrogen Determination in NitridesLearn more...

Aluminum and Aluminum Alloys

Oxygen in Aluminum and Aluminum AlloysLearn more...

Steel and metals analysis

Ultra Low Nitrogen and Oxygen in Iron, Steel, Nickel-Base, and Cobalt-Base AlloysLearn more...

Refractory Metals

Determination of Oxygen and Nitrogen in Reactive/Refractory Metals and Their AlloysLearn more...

Calcium Fluoride

Oxygen and Nitrogen Analysis in Calcium FluorideLearn more...

Steel and metals analysis

Hydrogen Determination in Steel and IronLearn more...

Steel and metals analysis

Simultaneous Oxygen, Nitrogen and Hydrogen Determination in Steel and IronLearn more...

Options & models


Various options are available for this product. Contact our sales and application specialists to select the right configuration for your application.
20 Position Shuttle Loader LECO Shuttle20 is designed to automate the sequential or non-sequential processing of up to 20 preweighed samples
SmartLine diagnostic LECO's convenient internet-based Remote Diagnostics system


Each instrument can be configured to meet your individual lab needs. Contact our sales and application specialists to select the right configuration for your application.
ONH836 True Simultaneous Oxygen/Nitrogen/Hydrogen.
ON836 True Simultaneous Oxygen/Nitrogen
O836 Oxygen only determinator
H836 Nitrogen only determinator
N836 Nitrogen only determinator