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Home >> Products >> Industrial Specialized Testing >> Various Testing >> High-frequency infrared carbon-sulfur analyzer

high-frequency infrared carbon sulfur tester

High-frequency infrared carbon-sulfur analyzer

Model: UT2113; ISO 1138

The high-frequency infrared carbon-sulfur analyzer uses a third-generation high-frequency furnace system and a double-layer infrared isolation system. The high-frequency furnace features internationally advanced vacuum ceramic capacitor excitation technology. Its high-power high-frequency combustion furnace provides excellent sample combustion performance, and it also comes with adjustable power that matches the sample analysis method. Once set, it can be used for life. This ensures different samples are fully burned while preventing the instrument from running at full load, improving both sample adaptability and instrument reliability. The infrared constant temperature system and all-mirror stainless steel piping ensure excellent repeatability and long-term stability.

This instrument has internationally leading dust removal technology, integrating brushing, blowing, separating, suction, and collection in one system, which maximizes the prevention of precision and repeatability issues caused by dust while greatly reducing the frequency of maintenance for operators.

Scope of application

It is suitable for measuring the total sulfur content in coal, coke, petroleum, petroleum, and other industries such as electric power, coal, metallurgy, petrochemicals, environmental protection, cement, papermaking, geological research, and research institutions, in accordance with GB/T214-2007 'Determination Methods for Total Sulfur in Coal'.

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General introduction

UnitedTest manufactures ISO 1138 compliant high-frequency infrared carbon sulfur analyzers with third-generation high-frequency furnace and all-in-one dust removal system, delivering stable, high-precision carbon and sulfur elemental analysis for industrial and laboratory material testing.

The high-frequency infrared carbon-sulfur analyzer is a professional elemental testing instrument fully compliant with the ISO 1138 standard, specially developed for accurate carbon and sulfur content detection in various solid material samples. Adopting a premium third-generation high-frequency furnace system and double-layer infrared isolation system, this testing equipment delivers exceptional analytical accuracy, outstanding operational stability and reliable test repeatability for industrial quality control and laboratory research.

Equipped with globally advanced vacuum ceramic capacitor excitation technology, the integrated high-power high-frequency combustion furnace achieves superior sample combustion performance. It supports adjustable power settings tailored to diverse sample analysis protocols, featuring one-time calibration and lifelong stable use. This intelligent power adjustment design ensures thorough and complete combustion of different types of test samples, avoids continuous full-load operation of the instrument, and greatly improves sample adaptability and overall equipment operational reliability.

Featuring a precision infrared constant temperature system and full-mirror stainless steel piping structure, the analyzer effectively eliminates external temperature interference and pipeline contamination, ensuring consistent test repeatability and excellent long-term working stability for long-cycle industrial testing tasks. It adopts industry-leading integrated dust removal technology that combines brushing, air blowing, separation, suction and centralized collection into a single automated system. This innovative design thoroughly prevents test precision errors and data deviation caused by dust accumulation, while significantly reducing daily maintenance workload and maintenance frequency for operators.

UnitedTest’s ISO 1138 certified high-frequency infrared carbon-sulfur analyzer is widely applicable for elemental analysis in metallurgical materials, metal alloys, building materials, chemical raw materials and industrial solids, serving standardized quality inspection, material formulation verification and third-party laboratory certification scenarios.

Key Features

Features
Test Methods
Test principle
Standard
Operation and Precautions:
Application
Keywords

▼ High degree of automation, easy operation: equipped with continuous automatic sample feeding and discarding devices, capable of loading 20 samples at once and adding samples continuously at any time.

▼ Program control for automatic temperature raising, temperature control, sample feeding, sample return, electrolysis, calculation, results, automatic storage and printing—all laboratory personnel do is weigh samples.

▼ Measurement time can be automatically determined based on different coal samples, with fast speed.

▼ Errors can be automatically corrected through experiments, ensuring accurate results.

▼ Standard serial port, can connect to electronic balances.

▼ Features automatic protection and overcurrent protection when the silicon carbide tube is powered on.

▼ Adopts an integrated structure, integrating components such as automatic sample feeding, sample displacement devices, cracking furnace, electrolytic cell, stirrer, sample feeding mechanism, and air purification system into the entire enclosure, making the instrument compact and aesthetically pleasing.

The analysis method of a carbon-sulfur analyzer is based on the core principle of converting the carbon and sulfur in a sample into carbon dioxide (CO₂) and sulfur dioxide (SO₂) gases through high-temperature combustion, and then detecting these gases to calculate their content. According to the analysis methods and principles, carbon-sulfur analyzers can mainly be divided into: infrared absorption carbon-sulfur analyzers (such as high-frequency infrared, arc infrared, tube infrared), gas volume/iodometric carbon-sulfur analyzers, non-aqueous titration carbon-sulfur analyzers, and conductivity carbon-sulfur analyzers. In addition, there are ICP methods, direct reading spectrometry, X-ray fluorescence, mass spectrometry, chromatography, neutron activation analysis, etc. Currently, the mainstream carbon-sulfur analyzers mainly use infrared absorption and conductivity methods, with high-frequency induction combustion-infrared absorption being the absolute mainstream technology due to its efficiency, accuracy, and high degree of automation.

1. Infrared Absorption Method (Infrared Carbon-Sulfur Analyzer): The carbon and sulfur in the sample are oxidized into carbon dioxide and sulfur dioxide gases under high-temperature conditions with enriched oxygen. After treatment, the gas enters the corresponding absorption cell and absorbs the respective infrared radiation. Signals from the detector are processed by a computer to output results. This method is accurate, fast, and highly sensitive, suitable for both low and high carbon-sulfur content. Infrared carbon-sulfur analyzers using this method, especially high-frequency induction combustion-infrared absorption types, have become mainstream due to their efficiency, accuracy, and high automation, though they are relatively expensive. They are suitable for situations requiring high analytical accuracy.

2. Conductivity Method (Conductivity Carbon-Sulfur Analyzer): This method measures carbon and sulfur content based on changes in conductivity. After high-temperature combustion, the mixed gas from the sample passes through a conductivity cell, where the resistivity (inverse of conductivity) changes, allowing the determination of carbon and sulfur content. This method is accurate, fast, and sensitive, mostly used for low carbon and low sulfur measurements.

3. Gravimetric Method (Combined Carbon-Sulfur Analyzer): Carbon is usually absorbed by alkaline asbestos, and its content is calculated based on the 'increase.' Sulfur measurement commonly uses a wet method, where the sample is decomposed with acid and oxidized to sulfate, then barium chloride is added in hydrochloric acid solution to form barium sulfate. The precipitate is filtered, washed, ignited, weighed, and the sulfur content is calculated. The drawback of the gravimetric method is its slow analysis speed, so it is unsuitable for on-site analysis, but it provides high accuracy and is still recommended as a standard method in laboratories and research institutions.

4. Titration Method (Titrator): Non-aqueous titration devices use acid-base titration to determine carbon and sulfur in steel. They are usually paired with arc furnaces and suitable for general labs or pre-furnace testing.

5. Volumetric Method (Gas Volume Carbon-Sulfur Analyzer): Commonly, carbon is measured by gas volume method, and sulfur by iodometric or acid-base titration. Especially, measuring carbon by gas volume and sulfur by iodometry is both fast and accurate. This is the most commonly used method for combined carbon and sulfur determination in China. Analyzers using this method have a precision with a carbon content lower limit of 0.050% and a sulfur content lower limit of 0.005%.

High-frequency induction combustion–infrared absorption is currently the mainstream technology for carbon-sulfur analyzers. Its analysis process mainly consists of three steps: sample combustion, gas purification, and concentration detection.

During the sample combustion step, the sample is oxygenated and burned in a high-temperature furnace, generating and releasing CO2 and SO2 gases. Gas purification is achieved by removing moisture and other interfering gas impurities through dust removal devices, drying devices, and impurity removal devices, resulting in pure CO₂ and SO₂ gases. Concentration detection is based on non-dispersive infrared (NDIR) detection, determining CO₂ and SO₂ concentrations by measuring the intensity changes of infrared light of specific wavelengths after absorption

Modern high-frequency infrared carbon-sulfur analyzers integrate multiple advanced technologies to ensure accuracy, stability, and high efficiency in analysis. The infrared detection system comes standard with three independent infrared absorption channels, which can be added as needed. The detector uses imported pyroelectric solid-state infrared detectors with constant temperature control in the air chamber to ensure measurement accuracy. The high-frequency combustion furnace features anti-crosstalk and radiation shielding designs, stable power, and is equipped with automatic cleaning and dust removal devices, employing dual gas circuit combustion and cooling designs. The gas circuit system uses micro-differential pressure flow control technology to ensure stable airflow, while the catalytic conversion system converts CO into CO2 and SO2 into SO3 for absorption, achieving zero pollution emissions. The intelligent software supports automatic reading, range switching, flux blank deduction, and flexible parameter settings, with database functionality and integration with LIMS.

The stability of the analysis results is influenced by various operational and conditional factors, mainly including sample weighing accuracy, flux addition and stacking sequence, crucible pretreatment, reagent efficiency and installation sequence, dust accumulation, and system ambient temperature.

The performance of high-frequency infrared carbon-sulfur analyzers is mainly determined by stability, accuracy, and reliability. Stability is determined by relative standard deviation (RSD) for short-term stability, and long-term stability by reproducibility. Accuracy is determined by the linearity of the calibration curve; after calibration of high-content standard samples, the measured values for low-content standard samples should be within the allowable error range. Reliability refers to the instrument's failure rate. High-performance instruments can measure carbon 0.00001%-10.00000% (scalable), sulfur 0.00001%-0.3500% (expandable), analysis time about 35 seconds, and precision meeting relevant national standards

ISO 1138 Rubber compounding ingredients — Carbon black — Determination of sulfur content

ASTM D1619 Standard Test Methods for Carbon Black—Sulfur Content

GB/T 3780.14 Carbon black—Part 14：Determination of sulfur content

1. The carbon-sulfur analyzer should be oxygenated before changing the sulfur absorption solution

2. The carbon-sulfur analyzer uses carbon and sulfur for simultaneous measurement. During testing, sulfur dioxide absorption is performed first, followed by carbon dioxide absorption. During titration, carbon should be fixed first; the upper part of the absorption cup should be kept blue to prevent carbon leakage. After carbon concentration reaches the endpoint, then sulfur should be set. When sulfur is set near the endpoint, wait briefly, then slowly adjust to the endpoint; otherwise, excess is likely.

3. The carbon-sulfur analyzer equipment should be placed away from corrosive gases such as acids and alkalis, to avoid dust and vibration disturbing the laboratory.

4. Laboratory temperature 10-30°C, humidity below 75%.

5. After analyzing the sample, discard the sulfur absorption liquid and refill it to its original volume to prevent carbon absorption liquid from redrawing. If resorption is detected, be sure to rinse it thoroughly with distilled water; otherwise, the next measurement will result in errors and lower sulfur results.

6. When shutting down the instrument, follow the prescribed steps; directly turning off the power may cause data loss and irreparable losses.

Carbon-sulfur analyzers are widely used in traditional industries like steel, metallurgy, casting, mining, machinery, electronics, chemical, and power sectors, and they've also expanded into new areas like new energy (such as lithium-ion batteries), new materials, magnetic materials, geological minerals, third-party testing, research institutes, semiconductors, ceramics, and cement.

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Main Technical Specification

Equipment use	Used for quantitative analysis of carbon and sulfur in steel, ferrous metals, non-ferrous metals, alloy materials, ores, soil, titanium dioxide, new energy materials, inorganic materials, and other non-metallic materials; Quantitative analysis of sulfur in coal.
Scope of analysis	Carbon: 0.0001%-99.9% Sulfur: 0.0001%-99.9% based on 1g sample
Detection system	Equipped with four detection cells: high carbon, low carbon, high sulfur, and low sulfur; High-sensitivity detectors; Both the carbon and sulfur tanks are independent tanks, with no shared components for the light source, frequency modulation, or detection sections
Detection methods	Carbon: Non-dispersive infrared absorption method, highly sensitive carbon infrared cellSulfur: Non-dispersive infrared absorption method, highly sensitive sulfur infrared tank
Sensitivity	Carbon: 0.01ppm Sulfur: 0.01ppm
Precision	Carbon: 1 ppm or RSD≤0.5% Sulfur: 1 ppm or RSD≤0.8%
Analyze the time	About 45 seconds, with the analysis endpoint adjustable by both absorbance and time
Analytical ability	Typically, 60 samples per hour
Calibration method	Single-point, multi-point, and linear calibration can establish first, second, third, fourth, and fifth-order correction curves
High-frequency furnace power	3.5KW/20MHz, dual air cooling system, quick assembly and removal of combustion tube components
Power is adjustable	Equipped with power adjustment functions that automatically match analysis methods
Heating temperature	2000°C (stepless adjustable)
Infrared constant temperature	Equipped with an automatic constant temperature system, temperature difference ± 0.5°C
Dust removal method	Intelligent dual-zone fully automatic dust removal, integrating high-pressure backblowing, dust brushing, dust removal, and dust collection all in one
Analyze parameters	It can be flexibly modified according to sample requirements, and standard curves can be established individually for each analytical condition
Catalytic device	CO to CO2 conversion device;Equipped with patented exhaust purification technology, exhaust and tail emissions meet environmental protection requirements;Online SO2 and C0 catalytic purification devices: no CO and SO2 emissions of toxic and harmful gases
Required gas	Oxygen, 99.5% purity, 35psi (2.41 bar), ±10%, no other gases required
Intelligent sleep mode	Equipped with an intelligent sleep function, the instrument automatically cuts off power and air when not operating
Data interface	Choose freely from USB, RS232, network card, and more
Data transmission	Automatically import weighing results
Power supply	220V/50Hz±5%
Appearance dimensions	596mm×664mm×871mm (width×depth×height)

Standard

ISO 1138 carbon black sulfur content test –

ISO 1138 Rubber compounding ingredients — Carbon black — Determination of sulfur content

ISO 1138 defines two test approaches to measure total‑sulfur mass‑fraction for all grades of rubber‑grade carbon black.

Two methods — a classical combustion furnace method (Method A) operating at 1425 °C with iodometric titration, and an automatic analyser method (Method B) performed in accordance with ISO 15671. Because of better safety and precision, Method B is the preferred method; Method A remains acceptable when automatic equipment is not available.

ASTM D1619 Carbon Black Sulfur Content Test –

ASTM D1619 Standard Test Methods for Carbon Black—Sulfur Content

ASTM D1619 is the international reference method for measuring total sulfurin carbon black. It defines two independent routes —Method A, high-temperature combustion at 1350 °C with infrared absorption detection, and Method B, X-ray fluorescence (XRF).