Nitrogen Oxide Analyzer Module

Nitrogen Oxide Analyzer Module

The NOx module is a continuous sensor-based nitrogen oxide analyzer used to detect pollutant nitrogen oxide gas in ambient air. The module is designed for use in the AQM 65 compact air monitoring station.

The NOx analyzer module incorporates Aeroqual’s proprietary gas-sensitive semiconductor (GSS) sensors. This sensor is similar to the GSS O3 but with a tuned microstructure for NOx detection. A thermal scrubber removes the effect of ambient ozone and a zero cycle compensates for sensor drift and interference effects from humidity and VOCs. Finally, the module has an integrated NO to NO2 converter that is >95% efficient.

Just like a traditional analyzer using chemiluminescence, this sensor-based NOx module can be field calibrated using standard calibration equipment and gases. This ensures direct traceability to USEPA (40 CFR Part 53) and EU (2008/50/EC) certified equivalent method instruments.

In contrast to traditional analyzers using chemiluminescence, the NOx module is compact, lightweight, and costs 5 x less to own and operate.

Typical applications

Typical applications include:

  • Urban and national ambient air quality monitoring

  • Roadside and near roadside monitoring

  • Coal fired power station perimeter monitoring

  • Mine perimeter monitoring

  • Oil and gas perimeter monitoring

  • Checking pollution ‘hotspots’

  • Air quality research

Sensor specifications

Sensor Code




Sensor Type



< 0.001

Lower detectable limit/ppm



< 0.003 ppm to 0.1 ppm
< 3% of reading above 0.1 ppm