Nitrogen Oxides (NOx)

Nitrogen oxides (NOx), which include both nitric oxide (NO) and nitrogen dioxide (NO2), are critical pollutants emitted from combustion processes, such as those found in vehicles, power plants, and industrial boilers. As key contributors to air pollution problems like smog, acid rain, and ground-level ozone, monitoring NOx is vital for environmental compliance, public health, and optimising industrial operations.

Signal Group’s NOx analysers offer precise, reliable, and continuous monitoring solutions designed to meet stringent regulatory requirements and reduce environmental impact.


Non Dispersive Infrared (NDIR) Multi-gas analysers are available in 1, 2, 3, 4 or 5 gas channel configurations, offering high levels of performance and flexibility. Options include CO, CO2, CH4, NO, N2O, SO2, HCl and O2.

low ranges E.g. 0-10 ppm CO

5 user-configurable ranges + autorange per channel

electronic pressure & temperature compensation

RS232 'AK' protocol, 4-20mA & 0-10VDC chart outputs


Chemiluminescent Detector (CLD) NOX analysers for NO/NO2/NOx measurement in engine emissions, combustion studies, process plant, Emission monitoring and medical gas production.

very low quenching from CO2 and H2O

electronic proportional flow controllers

special ozone generator uses air as feed gas

long life NOx converter (5 years)

Partner with Signal Group for Effective NOx Monitoring

Choose Signal Group’s nitrogen oxides analysers to ensure your operations are not only compliant with environmental regulations but also optimised for performance and safety.

Contact us today to learn how our solutions can be integrated into your emissions management strategy and help you achieve your environmental and operational goals.