High-performance sulfur dioxide analysis for your emissions monitoring applications

Servomex delivers highly accurate measurements of sulfur dioxide (SO2) emissions for your process. Our SERVOPRO 4900 Multigas continuous emissions monitoring system (CEMS) gas analyzer delivers a range of part-per-million (ppm) measurements for SO2 gas analysis in emissions monitoring applications for regulatory compliance and clean air.

Why measure sulfur dioxide?

Sulfur dioxide is one of the six criteria pollutants identified by the US Environmental Protection Agency as requiring control to meet air quality standards. Commonly resulting from the combustion of fossil fuels, it is harmful to human, animal, and plant life. Regulatory bodies across the world require emissions from industrial plants to be monitored by an SO2 gas analyzer. In most cases, heavy fines and other penalties may be levied for exceeding permitted SO2 levels.

How gas analyzers work to measure sulfur dioxide

An enhanced version of Infrared sensing, Gas Filter Correlation (Gfx) technology uses photometric analysis to deliver extremely accurate results when low-level measurements are needed, or where background gases may interfere with the measurement.

It is based on the ability of gases to absorb unique light wavelengths, and uses that property to identify the concentration of sulfur dioxide in a flue gas. Gfx delivers a real-time measurement response, unaffected by background gases. The measurement technique is virtually immune to obscuration of the optics, which prevents sensor drift and reduces calibration frequency.

Our sulfur dioxide gas analyzer

The SERVOPRO 4900 Multigas analyzer can be configured to measure up to four simultaneous gas stream measurements. This means it can be used as a standalone sulfur dioxide analyzer, or as part of a comprehensive CEMS system for a wide range of industries and processes including power generation, petrochemical, refining, waste incineration, iron and steel, pulp and paper, and cement manufacture.

Our solution for sulfur dioxide gas analysis

For accurate and reliable ppm measurements of SO2, Servomex provides the SERVOPRO 4900 Multigas analyzer. Configured with a Gas Filter Correlation sensor, it delivers high-range SO2 measurements (0-1,000/0-10,000 ppm), standard-sensitivity measurements (0-200/0-2,500 ppm), and high-sensitivity measurements (0-100/0-1,000 ppm).

A comprehensive solution for analysis of multiple flue gas components

Specifically designed for continuous emissions monitoring of flue gas, the SERVOPRO 4900 Multigas can deliver up to four simultaneous gas stream measurements.

It combines Servomex’s leading-edge sensing technologies with a modern digital platform, for next-generation performance at a low cost of ownership.

The 4900 Multigas is backwards-compatible with existing 4900 installations and uses the same reliable measurement technology, providing trusted gas analysis combined with the advanced digital communications required by modern systems.

Accurate technology for your SO2 gas analysis

Our Gfx sensing technology delivers a versatile measurement of sulfur dioxide concentration for CEMS analysis, meeting a range of safety and regulatory requirements.

Gas filter correlation

Gas Filter Correlation sensors deliver stable, ultra-accurate gas analysis

An advanced form of Infrared sensing, Gas Filter Correlation (Gfx) technology is ideal in applications with interferent background gases, delivering precise, sensitive measurements. It is used in our SERVOTOUGH SpectraExact 2500 photometric analyzer, and is a key technology for our SERVOPRO multi-gas analyzers, the MultiExact 4100, MultiExact 4200, and 4900 Multigas.

Learn more about Gfx technology

Real-time Infrared measurements of gases in a mixture

Infrared sensing is a flexible measurement technology based on the unique light-absorbing properties of some gases. It delivers a non-contact, real-time detection of the selected gas’s concentration in a mixture, and is widely used in our analyzer range, including portable analyzers, photometric products, and multi-gas analyzers.


Learn more about Plasma technology

Sulfur dioxide analysis resources

For more in-depth information about our Sulfur dioxide analysis solutions, download our additional expert resources





















Selected solutions for sulfur dioxide-based applications

Discover how our expert knowledge supports sulfur dioxide measurements for your application

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Servomex – gas analysis to empower a changing world

Servomex is the global leader in gas analysis, providing solutions for cleaner, more efficient industries, and enabling the manufacture of products that benefit everyone. With 70 years of expertise and research behind us, we deliver industry-changing gas analysis measurements for process control, quality, safety, emissions monitoring, and combustion efficiency.

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Global service support delivered locally

Wherever you are in the world, our network of service engineers provides the expertise you need to keep your ammonia analyzer operating at peak performance. With state-of-the-art service centers around the globe, you’ll always have the support your process needs.

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We provide tailored service packages that support your product throughout its life

Our global service network delivers the support you need to keep your analyzer or system operating at peak performance, for total peace of mind.

Broadly, we categorise our customers into two distinct groups

Purity & Specialty

Our Purity & Specialty (P&S) team provides products, knowledge and service to market sectors including industrial and medical gases, UHP gases, and semiconductor manufacture

Industrial process & Emissions

Our Industrial Process & Emissions (IP&E) division is responsible for our gas analysis solutions in the power generation, hydrocarbon processing and emissions monitoring markets

Choose the experts in Sulfur Dioxide gas analysis

The Servomex difference is clear from the start, all the way through to delivery of a sulfur dioxide gas analysis system that will transform your process.

We consult with you to determine what you need

Our team stays in place throughout the project, ensuring consistent communication. This starts with identifying the parameters that the system must meet to ensure optimum performance and ease of use.

We design and build your system in our dedicated facility

Our schematics and documents are reviewed by the customer until the final design is agreed upon. Our skilled engineers then assemble the system at one of our cutting-edge regional centers, with continuous evaluation throughout the build process.

We test and deliver your integrated solution

After internal testing and an intensive Factory Acceptance Test (FAT), the finished system is shipped for installation. Our expert support team can commission and calibrate the system and provide any necessary operator training.

Choose the experts in Sulfur dioxide gas analysis

The Servomex difference is clear from the start, all the way through to the delivery of an sulfur dioxide gas analysis system that will transform your process.

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