SERVOTOUGH hazardous area

The Laser 3 Plus Ammonia is optimized for ammonia slip DeNOx applications

A compact, high-performance Tunable Diode Laser (TDL) analyzer, specifically optimized for ammonia slip measurement, the Laser 3 Plus Ammonia offers unparalleled installation flexibility plus cost and performance benefits.

A fast-response measurement for ammonia slip

The SERVOTOUGH Laser 3 Plus Ammonia is a revolution in TDL Absorption Spectroscopy analysis: a highly compact gas monitor for in-situ cross-stack applications, which delivers exceptional performance benefits.

Our pioneering approach to design has produced an analyzer that occupies a footprint up to one-tenth the size of competitor products. This provides instant benefits in terms of installation ease and flexibility.

Combining the latest Wavelength Modulated Spectroscopy (WMS) measurement techniques with unique Servomex signal processing, the Laser 3 Plus Ammonia provides the most stable, repeatable results with minimal installation and maintenance costs.

Rhys Jenkins
Product Manager – Process Photometric Analyzers

A revolutionary approach to TDL gas analysis

By combining the latest advances in hardware with leading-edge software processing, the SERVOTOUGH Laser 3 Plus is a revolutionary step forward for TDL gas analysis. Servomex has approached TDL analysis afresh, creating an analyzer a fraction of the size without compromising performance. The result is TDL analysis that is easier and faster to install – saving valuable space while enabling much greater installation flexibility.

Low maintenance, low cost-of-ownership

The next-generation ethos of the Laser 3 Plus works hard to reduce costs at all stages. In addition to the immediate advantages of TDL technology – a non-depleting measurement which requires no sample conditioning system – the Laser 3 Plus compact design greatly reduces installation time, with small, light intuitive alignment for easy installation and maintenance. Full ethernet communications for commissioning, diagnostics and trouble shooting.

High performance monitoring

The hardware advances of the Laser 3 Plus are matched by advanced Wave Length Signal Modulated Spectroscopy processing software which eliminates drift over extended operational periods by automatically tracking on a sealed reference cuvette absorption line – Line Lock Technology. This robust tracking mechanism ensures a highly reliable and accurate operation over long periods, with calibration frequencies extended beyond twelve months for many applications. The result is a sturdy, general purpose and hazardous area optimized design which ensures Laser 3 Plus can handle the most challenging of locations; including particulate-rich environments.

Looking for an ammonia slip system? We can help

If you need a gas analysis system for your DeNOx application, emissions control and monitoring, or any other application, get in touch with our experts. We provide the process knowledge and engineering skills you need to see your project through to a successful conclusion.

Ready to buy? Here’s how it works

It’s easy to find the product you need for your application with Servomex


Get in touch to tell us what you need and the application you plan to use it for


Our expert team will help you select the right product package, ensuring you have the accessories and support to get the best performance from your analyzer


Your analyzer will be assembled in one of our state-of-the-art engineering centers and rapidly dispatched to your site

Benefits for ammonia slip applications

The compact Laser 3 Plus Ammonia TDL analyzer is specifically optimized for the fast, accurate and responsive measurement of ammonia (NH3).

A reliable measurement

Servomex’s own line lock cuvette technology ensures the Laser 3 Plus Ammonia continues to measure the required gas reliably.

Easy to use

The compact analyzer is simple to install, with a user-friendly interface and range of digital communications options.

Hazardous area approvals

The Laser 3 Plus Ammonia meets ATEX, IECEx and North American hazardous area approvals, and is IP66 and SIL 2 rated.

Unrivalled performance

  • Process temperatures up to 600°C *
  • Low detection limit
  • Negligable zero drift
  • Calibration 6-12 month

* Application and measurement dependent


  • Compact design Performs in high particulate environments
  • Path lengths from 0.7m to 10m
  • Minimal cross interference
  • Diverse mounting: ideal for ducts, stacks and reactor installations

Easy to use

  • Simple to install and operate
  • Robust and reliable
  • Space saving
  • Digital communications
  • Modbus over Ethernet
  • User friendly interface and rapid disconnect for easy calibration

Low cost of ownership

  • Intuitive alignment for easy installation and maintenance
  • Non-depleting TDL technology
  • No moving parts, no consumables
  • No sample conditioning system – reduced maintenance costs
  • No hazardous area purge required

Benchmark compliance

  • A TEX, IECEx hazardous area approvals
  • North American hazardous area Class 1 Div 2

Gases sensed, measurements and technologies

The SERVOTOUGH Laser 3 Plus Ammonia delivers exceptional TDL performance, with a fast response to measuring ammonia in DeNOx applications.

Gas Measurement
Ammonia ()



  • ATEX Cat 3 (Gases)
  • IECEx Zone 2 and Zone 21
  • North American Class 1 Division 2 and Zone 2 (Gas and Dust) pending
  • ATEX Cat 21 (Dust)
  • Safe Area / General Purpose
  • CE marked in compliance with ATEX, EMC, LVD and all other applicable directives

Schematics (select to expand)


131mm width (51/8”) 164mm high (61/2”) 302.4mm deep (119/10”)

110mm width (45/16”) 146mm high (53/4”) 247.6mm deep (93/4”) 


TRANSMITTER: <3.0 kg (6.6 lbs)

RECEIVER: <2.0 kg (4.4 lbs)

Get the detailed specifications

“For in-depth specifications you’ll want to download our technical datasheet which includes information on technology, performance, operating environment, sample conditions and compliance along with technical drawings and top-level benefits and applications.”

Rhys Jenkins
Product Manager – Process Photometric Analyzers

Download your complete resource pack for the Laser 3 Plus Ammonia

“Find out everything you need to know about this compact, fast-response TDL analyzer. Our Laser 3 Plus Ammonia resource pack contains the product brochure, operator manual, and other essential materials.”

Rhys Jenkins
Product Manager – Process Photometric Analyzers

Typical applications

The Laser 3 Plus Ammonia is a TDL analyzer specifically optimized to measure NH3 in ammonia slip DeNOx applications.

Process heaters | Incinerators | Thermal crackers | Thermal oxidizers | Power stations | Furnaces 

Process heaters and furnaces

A choice of technologies to fit your application

Learn more

Coal-fired thermal power

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

Learn more

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