For the detection of NO and H2S an EDL (electrodeless gas discharge lamp) is used. A combination of both technologies (UVRAS & UVLEDs) allows simultaneous gas analysis of NO, NO2 and SO2 in the lower ppm range, which is particularly important in flue gas analysis (CEM)2.

In the EDL, N2 and O2 are converted to NO and produce selective UV radiation. With this radiation a cross sensitivity free NO measurement is made possible. This method is called UV resonance spectroscopy (UVRAS).


  • Exhaust gas monitoring (CEM)2
  • Laboratory area
  • Biogas research
  • Industrial gas analysis
  • Engine test benches
  • Portable gas analysis (PEMS)3

Features & Benefits

  • Simultaneous NOx and SO2 analysis
  • Temperature controlled up to 55°C
  • Fast response time < 3 seconds
  • Durable EDL (> 16000h)
  • Flow-independent measurement 0-2L/min
  • No influence of gas humidity
  • No NOx converter required
  • High accuracy
  • Low power consumption
  • Compact size

1 F.S. – Full scale value / 2 Continuous Emission Monitoring / 3 Portable Emission Monitoring System