The basic design of the diode laser gas analyzer LDS 6 enables further opportunities in process gas analytics and continuous emission monitoring. The major benefit of the in-situ approach is the simple fact that the measurement is performed non-intrusively and in real-time – without any disturbance or delay due to gas sampling or gas conditioning.

The total benefit depends on the individual process. In almost any case, the elegant method leads to a higher efficiency and less efforts for installation and maintenance. As a consequence of the fast in-situ measuring the profitability and the environmental compatibility of most processes can be increased.

Besides emission monitoring there is a set of industrial applications where diode laser is already established as a standard tool for process optimization. Among the most important market segments in the process industries one will find, today:

  • Power generation/combustion industry
    Surveillance and optimization of DeNOx plants by measuring the ammonia slip behind SCR and SNCR DeNOx installations

  • Thermal waste treatment
    - Primary combustion control by fast measurements of the oxygen concentration and the gas temperature in furnaces and boilers.
    - Surveillance and optimization of flue gas cleaning systems by measuring the waste gas concentrations before and after gas cleaning steps.

  • Internal combustion engines
    Measuring the ammonia slip behind DeNOX catalysts in the waste gas system of engine test beds

  • Explosion safety
    Immediate and intrinsic safety (Ex i) concentration measurement in combustible gases like CO and CH4 or surveillance of the oxygen level in process streams, tanks or silos

  • Corrosion protection
    Fast and non-instrusive surveillance of moisture in corrosive gas mixtures



Max. number of components



O2, NH3, HF, H2O, CO2, CO, HCl

Smallest measuring range

Component-specific: 0-5 ppm to 0-5%


Central unit: 19" unit sensors: field version


  • Little installation effort

  • Minimum maintenance requirements

  • Extremely rugged design

  • High long-term stability through built-in, maintenance-free reference gas cell, field calibration is unnecessary

  • Real-time measurements