The combustibles measurement you need to control your combustion process

Keith Warren
Keith Warren
Process Oxygen, Zirconia & Oxygen Deficiency Product Manager

Servomex is the expert in combustibles gas analysis, with a trusted, reliable solution for combustion control measurements. Our SERVOTOUGH FluegasExact 2700 analyzer combines oxygen and combustibles measurements in a single device, helping to deliver effective combustion efficiency to the power generation and process industries.

Why measure combustibles?

A well-controlled combustion process requires an optimized air-to-fuel ratio. If there is too much oxygen, the reaction will be inefficient, and costly fuel consumption will increase. However, low-oxygen, fuel-rich conditions may create dangerous, explosive conditions.

Combustibles are the byproducts of incomplete combustion. To optimize the air-fuel ratio, accurate measurements of oxygen and combustibles are required to ensure safe and efficient operating conditions with minimal emissions.

How gas analyzers work to measure combustibles

Servomex’s Calorimetry sensor uses a four-quadrant bridge track, over-glazed to shield the circuit from the sample gas. Two quadrants are then coated in platinum catalyst; these quadrants form a Wheatstone bridge circuit, with the disc mounted in a cell heated to 300oC (572oF) or 400oC (752oF). When the gas sample is added, any COe present in the sample will combust on the catalyst, which will heat the respective quadrant and alter the Wheatstone bridge output voltage.

The output delivered will be directly proportional to the COe concentration, providing an accurate measurement.

SERVOTOUGH Servomex FlugasExact 2700

Our combustibles analyzer

The SERVOTOUGH FluegasExact 2700 is designed to measure O2 and COe in flue gases for improved combustion efficiency and reduced emissions. It meets the most demanding needs of combustion efficiency applications in the power generation and process industries.

Our solutions for combustibles gas analysis

Since flue gas analysis measurements for both combustibles and oxygen are required to control combustion, Servomex has developed the SERVOTOUGH FluegasExact 2700. This combines Zirconia oxygen sensing with a Calorimetry sensor for combustibles, delivering the measurements required using only a single gas analyzer.

SERVOTOUGH Servomex FlugasExact 2700

An effective solution for combustion gas analysis

Keith Warren
Keith Warren
Process Oxygen, Zirconia & Oxygen Deficiency Product Manager

The SERVOTOUGH FluegasExact 2700 measures oxygen and combustibles in the most demanding hydrocarbon processing and power generation applications. It is armed with an integral sampling system custom-designed for operation in some of the hottest and most extreme combustion environments.

Designed for high-temperature processes up to 1750°C (3182°F), the resilient FluegasExact 2700 is ideal for use in extreme heated environments. This makes it the analyzer of choice for a wide range of combustion applications, including process heaters, utility boilers, thermal crackers, incinerators, and furnaces.

Proven, compact technology for combustibles gas analysis

Our Calorimetry sensor measures combustibles (COe) from its exothermic reaction with oxygen over a catalytic platinum surface, which produces carbon dioxide. The heat generated is used to accurately determine the COe concentration.

Calorimetry delivers sensitive, accurate measurements of combustibles

Calorimetry technology – also known as Thick Film Catalytic sensing – is used in our SERVOTOUGH FluegasExact 2700 combustion analyzer to deliver parts-per-million (ppm) measurements of combustibles. It is paired with a Zirconia sensor to deliver a measurement of both oxygen and combustibles from a single analyzer, providing effective combustion control measurements.

Learn more about Calorimetry technology

Combustibles analysis resources

Find out more about the FluegasExact 2700 and its role in combustion analysis with our expert information

Servomex Gas Guide issue 4

Servomex Gas Guide issue 4

ES Magazine Issue 37 Clean Air Part 2

ES Magazine Issue 37 Clean Air Part 2

ES Magazine Issue 29 Clean Air

ES Magazine Issue 29 Clean Air

ES Magazine Issue 28 Gas Analysis Applications

ES Magazine Issue 28 Gas Analysis Applications

See how our COe measurement supports your combustion process

Our application knowledge supports your combustion analysis – see how our combustibles measurement provides the solution you need.

Coal-fired thermal power

Our total analytical solution delivers benefits in cost, process efficiency, safety and emissions across the process

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Process heaters and furnaces

A choice of technologies to fit your application

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Explore our full range of applications

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.

Atlas showing Servomex loctions

Global service support delivered locally

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

Service team meeting customer

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 & Speciality

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

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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

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Choose the experts in Combustibles gas analysis


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.

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

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