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MultiGas Ultraviolet Module NDUV / UVRAS

  • UVRAS = UV resonance spectroscopy
  • Allows simultaneous gas analysis of NO, NO2 and SO2



For the detection of NO an EDL (electrodeless gas discharge lamp) is used. 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).

A combination of both technologies (UVRAS & NDUV) allows simultaneous gas analysis of NO, NO2 and SO2 in the lower ppm range, which is particularly important in flue gas analysis (CEM, Continuous Emission Monitoring).
rit 2021 sensorik gehaeuse Intertego 3HE IT154430


  • Exhaust gas monitoring (CEM, Continuous Emission Monitoring)
  • Laboratory area
  • Biogas research
  • Industrial gas analysis
  • Engine test benches
  • Portable gas analysis (PEMS, Portable Emission Monitoring System)

Characteristics and Benefits

  • Group of detectable gases:
    SO2 NO2 NO
  • Temperature controlled up to 55 °C
  • Fast response time < 3 seconds
  • Durable EDL (> 16000 h)
  • Flow-independent measurement 0-2 L/min
  • No influence of gas humidity
  • No NOx converter required
  • Compact size
  • In »Thermobox« as standard for stable measurement conditions


  • Readjustment of the zero-point is recommended once a week.
  • Contamination of the measuring cuvette can lead to shifting of the end-point. Due to the integrated filter, re-adjustment of the end-point is generally not required – but can be performed once a year.
  • Additionally, cartridges filled with an inert and the respective test gas for recalibration of the zero and end-point can be provided.
  • Long-term drift is < 1% of Full Scale (F.S.) / 24 h.

Options / Additional Sensors

V 1.0 / Rev. 2022-06-06 / Subject to alterations.