SDIS401 Infrared Sulfur Analyzer
The SDIS401 Infrared Sulfur Analyzer is designed for the rapid and reliable determination of total sulfur in coal, coke, petroleum products, combustion residues, cement, rubber, building materials, soil, and other solid or liquid materials.
The instrument uses high-temperature combustion combined with infrared absorption detection. During analysis, the sample is completely combusted in an oxygen-rich atmosphere at temperatures of up to 1350°C. The sulfur contained in the sample is converted into sulfur dioxide, purified through a multi-stage filtration and drying system, and then measured by a high-stability infrared detector.
With a measuring range of 0.01% to 50% sulfur and an analysis time of no more than 120 seconds per sample, the SDIS401 offers an effective balance of analytical performance, operational simplicity, system reliability, and cost efficiency.
Its straightforward manual sample introduction eliminates complicated mechanical feeding mechanisms, making routine operation and maintenance easier. The instrument can also be integrated with the SDCHN636 Carbon, Hydrogen and Nitrogen Analyzer to provide a combined solution for the determination of carbon, hydrogen, nitrogen, and sulfur.
Key Features
Fast and Simple Sample Introduction
The rapid manual sample-loading design provides straightforward operation without complicated mechanical movements. Samples can be introduced quickly and reliably, reducing operational complexity and routine maintenance requirements.
Complete Combustion for Reliable Sulfur Recovery
The specially designed high-temperature combustion tube incorporates a recirculation chamber for secondary combustion. This helps ensure complete oxidation of the sample and reliable conversion of sulfur compounds into sulfur dioxide.
Stable and Accurate Infrared Detection
The ultra-low-drift infrared detection cell provides a stable analytical baseline. Under stable operating conditions, only one drift correction per working day is normally required, simplifying daily quality control while maintaining reliable results.
Efficient Gas Purification
A multi-stage filtration and drying system removes dust and moisture from the combustion gas before it enters the infrared detector. This protects the detector, minimizes contamination, and improves long-term analytical stability.
Patented Combustion Gas Curtain Design
The patented combustion-supporting gas curtain promotes complete sample combustion while preventing combustion gases from escaping through the furnace opening. This improves operational safety and helps maintain a cleaner laboratory environment.
Stable, Low-Dead-Volume Gas Path
The optimized gas-flow system is designed to minimize the influence of temperature changes on gas flow. Its compact and shortened flow path provides low dead volume, reduced sample carryover, and a stable infrared detector baseline.
Durable and Maintenance-Friendly Furnace
The patented furnace structure helps extend the service life of the combustion tube and furnace-port O-rings. Key consumable components are easily accessible and convenient to replace, reducing downtime and maintenance effort.
Optional Touchscreen Operation
The instrument can be equipped with a high-performance touchscreen tablet and an adjustable rotating support arm. The screen can be extended, folded, and repositioned to suit different operating positions and laboratory layouts.
Flexible CHNS Analysis Solution
The SDIS401 can operate as an independent sulfur analyzer or work together with the SDCHN636 Carbon, Hydrogen and Nitrogen Analyzer, providing a cost-effective integrated solution for C, H, N, and S elemental analysis.
Applicable International Standards and Methods
| Standard | Standard Title | Applicable Samples |
| ASTM C25 | Standard Test Methods for Chemical Analysis of Limestone, Quicklime, and Hydrated Lime | Lime, limestone, and kiln dust |
| ASTM D1619 | Standard Test Methods for Carbon Black—Sulfur Content | Carbon black |
| ASTM D4239 | Standard Test Method for Sulfur in the Analysis Sample of Coal and Coke Using High-Temperature Tube Furnace Combustion | Coal and coke |
| ASTM D5016 | Standard Test Method for Total Sulfur in Coal and Coke Combustion Residues Using a High-Temperature Tube Furnace Combustion Method with Infrared Absorption | Coal and coke combustion residues |
| ASTM D1552 | Standard Test Method for Sulfur in Petroleum Products by High Temperature Combustion and Infrared (IR) Detection or Thermal Conductivity Detection (TCD) | Petroleum and petroleum products |
| AOAC 2017 | Total Sulfur in Fertilizers: High-Temperature Combustion | Fertilizers |
| ISO 15178 | Soil Quality — Determination of Total Sulfur by Dry Combustion | Soil |
| ISO 19579 | Solid mineral fuels — Determination of sulfur by IR spectrometry | Solid mineral fuels |
| UOP 864 | Sulfur in Organic and Inorganic Materials by Combustion and IR Detection | Organic and inorganic materials |
Model Selection Guide
| Parameter | SDIS401 | SDICS450 | SDIS450 |
| Picture | |  | |
| Measurement Range | Sulfur: 0.01%–50%, expandable to higher ranges | Sulfur: 0.01%–50%, expandable to higher ranges Carbon: 0.1%–100% | Sulfur: 0.01%–50%, expandable to higher ranges |
| Sample Weight | 100-300mg(100mg recommended) | 100-500mg(100mg recommended) | 100-500mg(100mg recommended) |
| Analysis Time | Approximately 120 seconds | Approximately 180 seconds, depending on the sample and analytical parameters | Approximately 180 seconds, depending on the sample and analytical parameters |
| Maximum Sample Loading Capacity | 1 sample | Up to 50 samples can be loaded at one time, with continuous sample loading supported | Up to 50 samples can be loaded at one time, with continuous sample loading supported |
| Furnace Operating Temperature | 1250–1350°C; recommended temperature: 1300°C | 1250–1350°C; recommended temperature: 1300°C | 1250–1350°C; recommended temperature: 1300°C |
| Maximum Power Consumption | 4 kW | 4 kW | 4 kW |
| Power Supply | 220 VAC ±10%, 50 Hz ±1 Hz | 220 VAC ±10%, 50 Hz ±1 Hz | 220 VAC ±10%, 50 Hz ±1 Hz |
Application Notes
We are compiling our practical application experience into a growing collection of technical articles that will be published here regularly.
If you have an immediate analytical challenge before then—whether in mining, energy, advanced materials, or PFAS analysis—contact the Sundy Technology Application Laboratory. We provide customized method development, application optimization, and technical support to help you achieve reliable analytical results.
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Customer Testimonials
We have provided a complete set of Sundy testing solutions, including bomb calorimeter, sulfur analyzer, and thermogravimetric analyzer, to the fuel analysis laboratory of Kavçim Cement, a leading integrated cement plant on Turkey’s Black Sea coast. Sundy’s standardized instrument performance bring outstanding practical value to end users. The upgraded solution significantly simplifies daily operations, lowers manual intervention and maintenance costs, and unifies data consistency for routine fuel analysis.
We are very satisfied with Sundy’s product quality and technical support, and will continue to promote and recommend Sundy analytical instruments for more industrial laboratory projects in Turkey.
After more than 10 years of continuous cooperation and market verification, we confirm that Sundy’s products, especially its automatic calorimeters and elemental analyzers, have high precise temperature control, accurate testing results, and ultra-low failure rate. All products are fully compliant with international ISO and ASTM standard, completely meeting the testing demands of coal laboratories, power plants, industrial enterprises, universities and scientific research institutions.
We highly recognize Hunan Sundy Science and Technology’s strong production capacity, standardized quality management system, professional technical support team and excellent business credibility. In all our cooperation cases, Sundy has always demonstrated professionalism, reliability and a customer-oriented service attitude.
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