744 Series Carbon and Sulfur in Inorganic Materials by the Combustion Infrared Detection Technique


Touch interface

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

Automated Sample Loader

Optional sample loader provide unattended operation

Cornerstone Mobile

LECO Cornerstone Mobile Application

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

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LECO’s CS744 Series will redefine the way you determine carbon and sulfur in metals, ores and other inorganic materials. Using extensive customer feedback and innovative engineering, our latest instrumentation takes advantage of an immersive software platform that will increase usability and lower the cost-per-analysis.
Additional features—such as a variable power combustion furnace, improved IR cell design, rugged design, and available automation—make the CS744 a valuable resource for any industrial environment needing accurate analysis of carbon and/or sulfur.
LECO’s exclusive Cornerstone software enables the user to have complete access to analysis control, method settings, diagnostics, reporting and more in a highly-organized and immersive environment. Designed through a collaboration of customer feedback and innovative engineering, Cornerstone allows the user to conduct all of their day-to-day operations within a single Analysis screen designed for speed and ease of use. Our innovative grouping of sample data simplifies data output and automatically calculates relevant statistics, alleviating the need for additional data processing.


• Fast analysis in less than a minute
• LECO High-Efficiency Combustion Furnace is perfectly suited for all applications
• State-of-the art IR detection Cell Design for ultimate precision and stability of results
• Modern Cornerstone software : easy of use with reach functionalities
• Touch Driven Graphical User Interface
• Well engineered ergonomics and convenience of use
• Reliable Automation available for increased workload


The 744 Series system is designed for wide-range measurement of carbon / sulfur content of metals, ores, ceramics, and other inorganic materials.

 The instrument operation complies with recognized standard test method of High Temperature Combustion, like ASTM E1019 and its international analogs.

744 Series Features:

High Frequency Combustion Furnace

• High efficiency combustion

• High velocity vacuum cleaner

• Reduced leak points

• Electronic carrier flow monitor

• Reduced maintenance down-time

Improved IR Cell Design

• Thermostatic construction provides increased protection from ambient temperature fluctuations

• Solid-state infrared detection for both carbon and sulfur with no moving parts

• Long-life emitter drive and drift-free detection circuitry improve long-term stability

Convenience and automation

• Custom software designed specifically for touch operation

• High-velocity vacuum system keeps dust and debris contained

• Optional 10-and 60-sample autoloaders available for hours of worry-free operation


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.

CS744 Carbon and Sulfur Determination in High Carbon Ferroalloys

CS Determination in Ferroalloys is shown in this application note.Learn more...

CS744 – Carbon and Sulfur Determination in Low Carbon Ferroalloys

Ferroalloys are alloys of iron that contain a high level of one or more additional primary elements.Learn more...


This application note describes the Sulfur analysis of Battery Paste, Lead Oxide and Lead SulfateLearn more...


This method describes the Carbon/Sulfur analysis of soda lime glass with a high frequency furnaceLearn more...

Carbon and Sulfur Determination in Limestone/Dolomite

Carbon / Sulfur Determination in CaCO3 / Dolomite/ LimestoneLearn more...

Determination of Carbon In Nitrides by LECO C744

The determination of carbon in nitrides by LECO 744 series analyzer is a quick and direct measurement of nitride purity.Learn more...

Determination of Carbon and Sulfur in Cast Iron

The following application note outlines the setting and steps required to determine the carbon and sulfur levels in cast iron with the LECO CS/C/S744 series of elemental analyzers.Learn more...

Sulphur in Ore Concentrate

The following application note outlines the setting and steps required to determine the sulphur level in ore concentrates with the CS/S744. Learn more...

Carbon and Sulfur in Lime

Lime is a common classification of materials representing the manufactured forms of lime, quicklime and hydrated lime. It does not include limestone, the raw material for lime manufacturing. Ref: 203-821-476Learn more...

Carbon in Mold Powder

This application note outlines the system parameters and process steps to set up the LECO CS/C744 elemental analyzer to determine the amount of carbon in mold powder. Ref: 203-821-474Learn more...

Refractory and Reactive Metals by C744

Determination of Carbon in Refractory and Reactive Metals by LECO C744. Ref: 203-821-471Learn more...

Metal-Bearing Ores

Carbon and Sulfur in Metal-Bearing Ores and Related Materials by LECO CS744. Ref: 203-821-465Learn more...

Nickel-Base, Cobalt-Base Alloys

Carbon and Sulfur in Iron, Steel, Nickel-Base, and Cobalt-Base Alloys by LECO CS744. Ref: 203-821-457Learn more...

Copper and Copper Alloys

Sulfur in Copper Base MaterialsLearn more...

Options & models


Various options are available for this product. Contact our sales and application specialists to select the right configuration for your application.

10 Position Shuttle Loader

 LECO Shuttle10 is designed to automate the sequential or non-sequential processing of up to 10 preweighed samples

60 Position Shuttle Loader

The system consists of an expandable carousel stack featuring six stackable carousels that hold ten samples each

Auto Cleaner

Upgrades the manual cleaner to the automatic versions, reducing downtime and increasing safety


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.

CS744 Simultaneous carbon/sulfur determination

C744 For accurate carbon-only determination

S744 For accurate sulfur-only determination