• Green Enviro International Pvt Ltd
ISO 9001 : 2015     ISO 14001 : 2015     ISO 45001 : 2018    
Tunable Diode Laser (TDL) Gas Analyzer

The analyzer is based on Tunable Diode Laser Absorption spectroscopy (TDLAS) technology. It can detect and analyze gas concentrations in harsh environments such as dusty and high temperatures and corrosive areas while maintaining a high level of safety, quick response time, and high measurement accuracy.

Product features

  • Low measurement drift and a high level of reliability.
  • High detection sensitivity and a high resistance to interference.
  • On-Site isolation design eliminates the requirement for positive pressure gas sources.
  • Enables real-time remote locking and range checking, enhancing the instrument's stability.


The transmitter portion of the LGA system consists mainly of diode laser, laser driver and HMI modules, realizing diode laser driving, spectrum data processing and human-machine interface. The receiver unit of the analyzer is composed of a photoelectric sensor, signal processing and purge control modules, is capable of signal processing and anti-explosion control.


The laser beam from the transmitter unit passes across the stack or duct work and is absorbed by the measured gas. The attenuated light is then detected by the photoelectric sensor in the receiver unit, and the resulting signal is sent back to the transmitter unit and analyzed to yield gas concentration.

No Cross Interference

The laser spectrum features excellent monochromaticity with spectral width down to 0.001nm, which is much narrower than spectral width of other light sources. By utilizing the ‘Single- line’ spectroscopy, a well-targeted laser spectrum can be sorted out to cover only the measuring gas without overlapping spectrum of all background gases.