Gas Monitoring

Tunable Diode Laser R-series Laser

  • TDL (Tunable Diode Laser) technology for unmatched accuracy and reliability high sensitivity ppb to percent level measurements.
  • One analyzer can be used for up to 8 measurement points
  • Corrosive/toxic applications
  • Approved Zero & Span Calibration checks
  • Extremely Fast
  • Compact and simple to install
  • Operates in high dust/moisture applications
  • Unaffected by stack/duct alignment changes
  • Off Stack/Process extractive option.

The Tunable Diode Laser System is a continuous monitor designed to measure flue gases for both compliance and process monitoring.

The Controller uses a Near Infrared (NIR) Tunable Diode Laser Absorption Spectrometer System utilizing a single mode “DFB” laser mounted in a thermoelectric cooler for unsurpassed accuracy and performance. Because the Spectral purity of the laser is high and the selected absorption feature is unique, measurements can be made free of interferences from any other gas.

The measurements are made in-situ across the stack or duct in either a single or dual pass design depending upon the application. A Windows based software package is available to display the data on either a Host laptop PC or the client’s existing data acquisition system.

For Measuring
CO, CO2, O2, HF, HCl, H2O, H2S, NH3, CH4, C2H6, C2H4, C2H2, HCN, HDO, D2O

Differential Optical Absorption Spectroscopy(DOAS)

Key Features

  • DOAS with sensity down to ppb level
  • It can measure more than one gas at a sane wavelength
  • It uses Broadband light source(xenon arc lamp)
  • Extremely fast
  • Compact and simple to install
  • It can be used as Extractive as well as In-situ analysis based on application


Differential Optical Absorption Spectroscopy or DOAS, is based on the principle of measuring the differential absorption of the incoming signal in the wavelength region of interest after it has passed through a gas medium. It uses a broadband light source and the measurement is made over a large wavelength range (like FTIR and NDIR, and

unlike TDL that uses a very narrow wavelength range). In general, overlap of absorption features of several gases is observed. This requires the use of multiple regression methods of analysis. The concentrations of a gases are calculated by comparing the absorption signals with their stored reference signals. As in any broadband measurement technique, interference from other gases must be taken into account and corrected for to improve accuracy of measurement. This requires a prior knowledge of the gas composition before the final measurements can be made.

For Measuring
SO2, NO, NO2, NH3, CS2, O3, Cl2, ClO2, HCHO, Benzene, Toluene, Xylene,
Styrene, Napthalene

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