How Does a G4 ICARUS Combustion Analyzer Work?

Behind every high-performing material lies a careful balance of chemistry. Carbon and sulfur, although often present at relatively low concentrations, can have a significant influence on processing behavior and final product quality. Measuring carbon and sulfur accurately requires an analytical solution that can look beyond surface characteristics. The G4 ICARUS Combustion Analyzer utilizes high-frequency combustion and advanced gas detection technologies to evaluate the complete sample, delivering dependable carbon and sulfur analysis regardless of how these elements are distributed across the material.

Why Matrix Independence Matters

Many analytical techniques, such as optical emission spectroscopy (OES), rely on surface measurements to determine elemental concentrations. Although effective in some applications, surface-based methods can struggle when carbon or sulfur is concentrated in specific regions rather than distributed uniformly throughout the sample. Unlike surface-scanning technologies, a combustion analyzer evaluates the entire sample mass. Because the complete specimen is combusted and measured, localized concentrations have far less influence on the final result. The outcome is a more representative assessment of elemental content, regardless of how the material is structured internally.

Matrix-independent analysis supports reliable quality control in the following industries:

• Mining and minerals- monitoring sulfur concentrations in ore concentrates helps assess processing performance and product quality.
• Foundries and cast iron production- accurate carbon measurements remain achievable despite irregular graphite flake distribution.
• Ceramics and cement manufacturing- consistent analysis supports process control for refractory materials, oxides, nitrides, and hydraulic binders.

By analyzing the whole sample, and not just a small surface area, a combustion analyzer provides assurance that reported values reflect the material as a whole.

Inside the G4 ICARUS: The Anatomy of a Combustion Analysis

High-Frequency Induction and Sample Combustion

Combustion analysis starts with transforming a solid sample into measurable gases. Typically, between 0.1 and 1 gram of inorganic material is placed inside a ceramic crucible together with metallic accelerators such as tungsten or iron. These additives support rapid heating and complete oxidation during combustion. Once loaded, the sample enters an adjustable high-frequency induction furnace. Exposure to a powerful electromagnetic field generates intense localized heat, causing the material to melt quickly within an oxygen-rich atmosphere. In this reaction, carbon converts to carbon dioxide (CO₂), while sulfur forms sulfur dioxide (SO₂).

After generation, the combustion gases must be transported efficiently to the detection system for accurate measurement. However, the combustion process also produces dust, slag, and other reaction by-products that can interfere with gas transport if they are not effectively managed. To address this challenge, the G4 ICARUS Combustion Analyzer incorporates ZoneProtect technology. A dedicated gas extraction nozzle introduces oxygen directly into the combustion zone and simultaneously removes liberated gases. Instead of allowing reaction products to circulate throughout the chamber, the system captures them immediately once formed. Consequently, the combustion environment remains cleaner, gas transport becomes more efficient, and combustion efficiency is enhanced.

Advanced Filtration and Automatic Maintenance

Following combustion, the released gases must be prepared for precise measurement. Within each combustion cycle, small quantities of dust and solid byproducts are produced. Should these particles accumulate within the gas pathway, analytical performance can gradually decline. Accordingly, the G4 ICARUS combustion analyzer directs the gas stream across a high-efficiency dust filter featuring an ultra-fine pore size of 3 micrometers. This filtration stage removes contaminants before they reach sensitive optical components.

A variety of combustion analyzers require regular manual cleaning to preserve performance. Dust build-up can contribute to calibration instability and increased maintenance demands. Beyond filtration, the instrument incorporates a fully automated, brush-free cleaning mechanism. In less than one minute, the extraction nozzle and inline filter are cleaned simultaneously, with residue returned directly to the crucible for disposal. As a result, every analytical cycle begins with a clean gas pathway, supporting reproducible results and long-term stability.

Gas Detection and Elemental Quantification

Following filtration, the purified gases proceed to the detection stage, where carbon and sulfur concentrations are measured.

Carbon Detection via Dual-Range NDIR

During combustion, carbon converts to carbon dioxide. Determining carbon content therefore necessitates accurate measurement of the resulting carbon dioxide gas. The G4 ICARUS Combustion Analyzer uses Non-Dispersive Infrared (NDIR) detection technology for such a purpose. A dual-range detector configuration enables accurate measurements across both trace-level and high-concentration carbon ranges. Reference beam paths compensate for signal fluctuations and thus retain analytical stability. Because the optical system operates without moving components, calibration drift is minimized.

Sulfur Detection via UV-LED Absorption

Sulfur analysis focuses on the sulfur dioxide generated in combustion. The G4 ICARUS Combustion Analyzer does not rely on traditional infrared methods. It uses ultraviolet light-emitting diode technology. Within the detection chamber, sulfur dioxide absorbs ultraviolet light far more effectively than infrared radiation. This characteristic produces a significantly stronger analytical signal. Compared with conventional infrared sulfur detection, UV-LED absorption delivers a signal-to-noise ratio approximately ten times higher. In addition, the G4 ICARUS Combustion Analyzer offers a broad linear dynamic range and remains unaffected by ambient temperature fluctuations, enabling reliable sulfur measurements across diverse operating environments.

Designed for Accuracy, Built for Productivity

The ability to accurately measure carbon and sulfur can have a direct impact on product quality, process efficiency, and regulatory compliance. Designed for speed, precision, and long-term reliability, the G4 ICARUS Combustion Analyzer helps laboratories generate dependable results for a broad range of sample types. Contact XRF Scientific today to discuss how the G4 ICARUS Series 2 can support your testing objectives.