We create expert solutions for industrial ammonia gas analysis

Rhys Jenkins
Rhys Jenkins
IP&E Spectroscopic Product Manager

Get reliable ammonia measurements for your industrial process with Servomex. Our ammonia analyzer range provides expert solutions for ammonia slip in DeNOx applications, and NH3 measurements in many processes. The SERVOTOUGH Laser 3 Plus Ammonia uses Tunable Diode Laser sensing technology to provide part-per-million (ppm) measurements for ammonia slip and NH3 emissions applications. The SERVOTOUGH SpectraExact 2500 is a rugged photometric analyzer that measures NH3 at percentage levels in a range of industrial applications.

Why measure ammonia?

In power plants and various other combustion processes, the removal of waste NOx is typically achieved by selective catalytic reduction (SCR) or selective non-catalytic reduction (SNCR).

NH3 is injected into the flue gas flow from combustion, reacting with NOx to form water (H2O) and nitrogen (N2). Unreacted NH3 is commonly referred to as ammonia slip, and is generally held to <2 parts per million (ppm) to optimize the process.

Additionally, US EPA PS18 sets out the standard for reliable CEMS monitoring of NH3 as a precursor to harmful particulates.

There are also a number of chemical manufacturing processes – such as those for ethylene and ethylene dichloride – where monitoring ammonia levels is essential for safety, efficiency, and quality control.

Controlling ammonia slip

Accurate measurement of ammonia slip is important for the operation of DeNOx equipment. High levels of unreacted NH3 are wasteful and costly, while ammonia slip may also have a significant impact on deposition and catalyst plugging. It can also affect potential corrosion of downstream equipment.

Excessive ammonia slip in a coal-fired power plant can create fly ash with high levels of NH3, rendering it unfit for sale as a mineral filler in asphalt or cement plants.

The level of ammonia slip also provides diagnostic information on the proper function of the SCR/SNCR system and the NOx reduction process.

By holding ammonia slip to < 2 ppm, the process can be optimized, delivering operational, cost and safety benefits. However, it is difficult to control without direct measurement using an ammonia analyzer.

A superior solution for NH3 analysis

Advanced Tunable Diode Laser (TDLAS) technology presents a complete and effective solution for accurate ammonia slip control.

Consisting of a tunable diode laser light source, transmitting optics, receiving optics and detector, TDLAS technology is suitable for in-situ, cross-duct measurements. Because the analyzer is installed across a duct or stack, it produces an average concentration reading rather than a point reading that is obtained from an extractive sample, so NH3 concentration levels can be measured with much greater certainty.

The NH3 sample also never leaves the process, so the complications experienced with sample transports in extractive methods are avoided, as well as contaminant problems posed by the dust, heat, and water.

This means not only is the measurement considerably more accurate, but plant operators avoid much of the downtime required for cleaning of extractive systems.

Our solutions for ammonia gas analysis

Servomex offers two key NH3 analyzer products for the measurement of ammonia. The SERVOTOUGH Laser 3 Plus Ammonia  measures NH3 at ppm levels for ammonia slip and emissions monitoring applications, while the SERVOTOUGH SpectraExact 2500 is a multi-gas analyzer that can be configured to measure percentage levels of ammonia in industrial processes.

Laser 3 Plus Process Tunable Diode Laser (TDL) analyzer

A fast-response NH3 gas analyzer for ammonia slip and clean air

Rhys Jenkins
Rhys Jenkins
IP&E Spectroscopic Product Manager

The SERVOTOUGH Laser 3 Plus Ammonia  is a revolution in Tunable Diode Laser (TDLAS) Absorption Spectroscopy analysis: a highly compact ammonia gas analyzer for in-situ cross-stack applications, which delivers exceptional performance benefits for clean air processes.

Installed directly into process ducts, it is ideal for monitoring ammonia slip during NOx reduction processes such as Selective Catalytic Reduction (SCR) or Selective Non-Catalytic Reduction (SNCR), controlling the level of ammonia slip to between 2-3 parts per million.

Delivering an average measurement of NH3 across the duct, it returns precise readings even during inconsistent flow conditions. With auto-validation software available to ensure ongoing accuracy, the Laser 3 Plus Environmental provides industry-leading installation flexibility and cost and performance benefits.

Real-time photometric analysis of corrosive, toxic and flammable gas streams

Rhys Jenkins
Rhys Jenkins
IP&E Spectroscopic Product Manager

A highly flexible analytical solution adaptable to many applications, the SERVOTOUGH SpectraExact 2500 delivers proven performance and flexible operation in a resilient and reliable design.

It delivers a real-time online monitoring solution capable of single and multi-component analysis, including percentage-level ammonia. Field mounting capabilities enable flexible use in the harshest process conditions.

Highly affordable, the SpectraExact 2500 uses an intelligent design and non-depleting sensing technologies to help to extend maintenance intervals and dramatically reduce ongoing costs.

Proven Ammonia sensing technologies

Our ammonia analyzer range uses proven sensing solutions that deliver accuracy, ease of use, and a long operational life.

Tunable Diode Laser

Obtain fast, in-situ cross-stack measurements with TDL sensing

Tunable Diode Laser (TDLAS) technology offers a fast-response, accurate measurement that is highly specific to the gas of interest. This non-contact, non-depleting sensing is used in our innovative, compact SERVOTOUGH Laser 3 Plus range of analyzers.


Learn more about TDLAS technology
Laser Moisture

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

Ammonia analysis resources

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

SERVOTOUGH Laser 3 Plus Environmental Product Brochure

Download the SERVOTOUGH Laser 3 Plus Environmental Brochure to find out more about this product.

SERVOTOUGH Laser 3 Plus Environmental Product Brochure

Download the SERVOTOUGH Laser 3 Plus Environmental Brochure to find out more about this product.

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DeNOx process and measuring ammonia slip expert paper

A reliable, fast-response solution for ammonia monitoring in CEMS and DeNOx applications.

DeNOx process and measuring ammonia slip expert paper

A reliable, fast-response solution for ammonia monitoring in CEMS and DeNOx applications.

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Selected solutions for ammonia-based applications

Our digital ammonia sensors, including TDLAS, Infrared, and Gas Filter Correlation, provide solutions to a wide range of processes that require an NH3 analyzer.

Ammonia slip and emissions

We have the solutions to make your process more efficient

Coal-fired thermal power

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

Ethylene production

We have the solutions to make your process more efficient

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.

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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.

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 & 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

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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 Ammonia 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 an ammonia gas analysis system that will transform your process.

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