Laser 3 Plus Ammonia

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

Compact TDL analyzer offers unique features & low cost-of ownership, with fast response to measuring ammonia in DeNOx applications

Gas: NH3


Application: Emissions and Process Control

Sensing Technology: Tunable Diode Laser


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


  • Compact design 
  • Performs in high particulate environments
  • Path lengths from 1m to 10m - dust level dependent 
  • Minimal cross interference 
  • Diverse mounting: ideal for ducts and stacks 

Easy to use

  • Simple to install and operate 
  • Robust and reliable 
  • 0-15ppm min. range
  • 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 

Unrivalled performance

  • Process temperatures up to 600°C 
  • Low detection limit 
  • Negligable zero drift 

Benchmark compliance

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



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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