Laser 3 Plus Process

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The SERVOTOUGH Laser 3 Plus Process 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 Process delivers exceptional TDL performance, with a fast response optimized for the measurement of O2 or 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.

CO measurement available 2017.

Compact TDL analyzer optimized for process gas measurements with unique features and low cost-of ownership

Gas: CO, O2

Measures:%,  ppm

Application: Combustion Control and Process Control

Sensing Technology: Tunable Diode Laser


  • Oxidation control
  • Inerting
  • Safety monitoring
  • Process control
  • Flare gas monitoring
  • Combustion control (<500C)
  • Coal to chemical


  • Compact design 
  • Performs in high particulate environments 
  • 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 100% 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 
  • No hazardous area purge required 

Unrivalled performance

  • Process temperatures up to 500°C 
  • Low detection limit 
  • Negligible zero drift 
  • Fast response 

Benchmark compliance

  • ATEX, IECEx hazardous area approvals 
  • North American hazardous area approvals pending 
  • CE approved 
  • Wide process ambient temperature range 
  • IP66
  • SIL 2


    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) 


  • 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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