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Tunable Diode Laser (TDL) Gas Analyzer

Product Summary:

Utilizing proprietary technologies of Tunable Diode Laser Absorption Spectroscopy (TDLAS), FPI delivers the LGA system to satisfy in-situ measurements with high accuracy, fast response, strong reliability and virtually maintenance free


FPI LGA system is applicable to almost all industrial process, especially well proven in harsh conditions in combination of high temperature, pressure, dust, corrosives and contaminants.

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Product overview Product features Application area
Product overview




Based on the Tunable Diode Laser (TDL) technology, LGA-4000 is a highly reliable laser gas analysis system that monitors various toxic and hazardous substances (HF, NH3, H2S, HCI) from stack emission with high accuracy, strong reliability and is virtually maintenance-free.


Leveraging an installed base of over 8,000 units, the LGA system has been extensively used for combustion and safety control, process optimization, energy recovery, scientific research as well as environment monitoring. To date, these units have been employed in metallurgy, refinery, petrochemical, natural gas, power plant, waste incineration, cement and other situations where gas measurement is needed. 

Product features
  • In-situ, no gas sampling
  • No cross interference
  • A fast response less than one second
  • Diverse optical length (0.5~20m)
  • Reliable in all harsh conditions: high temperature & pressure, dust density, moisture, and corrosion
  • Online calibration, no zero drift
  • Thousands of tailor-made solutions for various applications
  • International ATEX certified 


Application area



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