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The LaserGas measuring principle TDLAS (Tuneable Diode Laser) is a comparatively new measuring principle. It is used for in-situ measurements of for instance O2, CO2, CH4, H2S, H2O, HCl, HF and NH3 gasses. The LaserGas instruments are often used for applications where short response times are essential or for applications where the gasses to be measured are complicated to measure in a conventional extractive analysis system.

LaserGas measurements are performed by laser light to be sent across the exhaust gas duct by a specific wavelength. The absorption of the light sent into the process is an indicator for the concentration of gas to be analysed. The wavelength is thoroughly selected for the specific gas so that interference from other gasses is avoided.

The LaserGas measuring principle is very reliable even in high temperatures and dust concentrations. By means of automatic adjustments, it is possible to have a reliable measurement even if the transmission of light is only at 2-5%.

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