SERVOTOUGH hazardous area

The Laser 3 Plus Combustion is a compact, fast-response analyzer

Containing all the benefits of Servomex’s Tunable Diode Laser (TDL) technology in a light, compact unit, with unmatched installation flexibility plus cost and performance benefits, the Laser 3 Plus Combustion is ready for fast, accurate and responsive measurements in combustion and process control, making it a must for safety applications.

Unique features and a low cost-of-ownership

The SERVOTOUGH Laser 3 Plus Combustion is a revolution in TDL Absorption Spectroscopy analysis: a highly compact gas monitor measuring oxygen (O2), carbon monoxide (CO) and methane (CH4) in 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 provides the most stable, repeatable results with minimal installation and maintenance costs, offering a fast response measurement of O2, CO or a combination of CH4 and CO.

Rhys Jenkins
Rhys Jenkins
Product Manager – Process Photometric Analyzers
Servomex System components

Let us help build your combustion monitoring system

We have the technology and applications knowledge you need to design and build a gas analysis system. Get in touch with us for start-to-finish project management that delivers the best results.

Ready to buy? Here’s how it works

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

Servomex UK technical center


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

Servomex Gas System Schematics


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

woman Assembling Sensors


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

Performance benefits for combustion analysis

The compact Laser 3 Plus Combustion TDL analyzer can be optimized for the fast, accurate and responsive measurement of O2, CO or CO+CH4.

Ideal for hazardous conditions

The Laser 3 Plus Combustion has ATEX, IECEx and North American hazardous area approvals. It is also approved for process Zone 2, SIL 2 assessed, and CE marked.

Compact design

The size of the Laser 3 Plus Combustion ensures it can be easily installed by a single engineer, with the on-board display negating the need for laptop configuration.

Reliable measurements

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

Gases sensed, measurements and technologies

The Laser 3 Plus Combustion is optimized for the fast-response measurement of O2, CO or a combination of CH4 and CO in a wide range of applications.

Gas Measurement
Oxygen ()
Carbon monoxide ()
Carbon monoxide + methane (),


SERVOTOUGH Servomex Laser 3 Combustion


  • 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 (5 1/8”) 164mm high (6 1/2”) 302.4mm deep (11 9/10”)

110mm width (4 5/16”) 146mm high (5 3/4”) 247.6mm deep (9 3/4”)


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
Rhys Jenkins
Product Manager – Process Photometric Analyzers

All the resources you need – download your Laser 3 Plus Combustion pack

“The resource pack for the Laser 3 Plus is your comprehensive source of essential analyzer information. It provides details about features, benefits and technical specifications, and includes the product brochure and operator manual. Download it now.”

Rhys Jenkins
Rhys Jenkins
Product Manager – Process Photometric Analyzers

Typical applications

A compact TDL monitor, the Laser 3 Plus Combustion offers a full range of combustion gas measurements for a wide range of applications.

Process heaters and furnaces

A choice of technologies to fit your application

Learn more

Carbon capture and storage

Extensive solutions for a range of carbon capture processes

Learn more

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