Laser 3 Plus Combustion

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

Servomex’s pioneering approach to design has produced an analyzer that occupies a footprint up to 1/10th the size of competitor products. This provides instant benefits in terms of installation ease and flexibility. 

The Laser 3 Plus Combustion delivers exceptional TDL performance, with a fast response optimized for the measurement of O2, CO or a combination of CH4 and CO in a wide range of applications. Utilizing 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.

Compact TDL combustion series measures O2, CO and CH4offering unique features and low cost-of ownership

Gas: CO, CO+CH4, O2

Measures:%,  ppm

Application: Combustion Control and Process Control

Sensing Technology: Tunable Diode Laser


  • Process heaters 

  • Incinerators 

  • Thermal crackers 

  • Thermal oxidisers 

  • Power stations 

  • Coal mills 

  • Furnaces 


  • Compact design 

  • Performs in high particulate environments 

  • Path lengths from 0.1m to 25m 

  • Minimal cross interference 

  • Diverse mounting: ideal for ducts, stacks and reactor installations 

Easy to use

  • Simple to install and operate 

  • Robust and reliable 

  • 0-1% up to 0-25% range available

  • Space saving 

  • Digital communications: Modbus, Ethernet 

  • User friendly interface rapid disconnect for easy calibration 

Low cost of ownership

  • Small, light intuitive alignment for easy installation and maintenance 

  • Non-depleting TDL technology requires no replacement 

  • No moving parts, no consumables 

  • No sampling system reduces maintenance costs 

  • Purges with instrument air not nitrogen due to the application of advanced spectroscopy techniques 

Unrivalled performance

  • Process temperatures from 700°C up to 1500°C "Hot Oxygen" analysis 

  • Low detection limit 

  • Dual line oxygen monitoring for continuous oxygen readings from ambient to 1200°C 

  • Negligible zero drift 

Benchmark compliance

  • ATEX, IECEx hazardous area approvals 

  • North American hazardous area approvals pending 

  • CE approved 

  • Wide process ambient temperature range 

  • IP66 

  • SIL 2 compliance 


    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) 


  • 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 


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