736 Series Oxygen/Nitrogen by Inert Gas Fusion Infrared and Thermal Conductivity Detection Technique


Cornerstone Mobile

LECO Cornerstone Mobile Application

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

Touch interface

736 series touch screen

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



Available autocleaner minimizes the need for manual cleaning between analyses

Automated Sample Loader


Optional 20-position sample loader provide unattended operation


LECO’s ON736 Oxygen/Nitrogen Elemental Analyzer is designed for routine measurement of oxygen and nitrogen content of inorganic materials, steel, ferrous and nonferrous alloys, and refractory materials using the inert gas fusion technique.

The ON736 instrument is compliant to ASTM and ISO approved methods.  It is perfectly suitable for elemental analysis of reactive/refractory metals, like Titanium, Tantalum, Zirconiumand their alloys.

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.

Benefits :

  • Analysis time 100 seconds
  • Accuracy and precision to low-ppm levels
  • High-Performance LECO detectors assure results quality, drift-free and long-life operation
  • Modern Cornerstone software : easy of use with reach functionalities
  • Well engineered ergonomics and convenience of use with bench space saving
  • Optional auto cleaner minimize need for cleaning between analysis
  • Reliable Automation available for increased workload


A number of models and configurations are available for 736 Series to fit your particular needs.  Please contact us for more details.


The ON736 is designed for fast simultaneous determination of oxygen and nitrogen content in steel and other inorganic materials.

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)
Gases are swept out of the crucible by an inert carrier gas flow (helium or argon)
Oxygen is detected using a non-dispersive infrared (NDIR) cell.
Nitrogen is measured by termo conductivity (TC) detector

 Features and Benefits :

  • Integral Sample Loading Area minimizes atmospheric contamination during sample introduction
  • Jam Free Sample Drop
  • Choice of either argon or helium carrier gas
  • Novel electrode design increases heat transfer efficiency for increased stability
  • High efficiency cooling
  • Built in vacuum cleaner keeps working area clean
  • Thermostated detector design with built-in drift compensation circuitry


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 Nitrogen Determination in Refractory Metals and Their Alloys

Oxygen and Nitrogen determination in refractory metals like Titanium, Zirconium and othersLearn more...

NEW ! Oxygen and Nitrogen in Solid Iron, Steel, Nickel-Base, and Cobalt-Base Alloys

The LECO ON736 provides a cost-effective and efficient means of simultaneously determining the amount of oxygen and nitrogen in steel, nickel-base, and cobalt-base alloys. The following application note outlines the hardware requirements, system settings, and expected performance of this test.Learn 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...

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

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

Performance Package
Adds a three stages carrier gas purification system, and a dual loop gas dose module

Integrated autocleaner
Automatically cleans the upper electrode and lower electrode tip


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.


True Simultaneous Oxygen / Nitrogen


Oxygen only determinator


Nitrogen only determinator