Combustion and Ultra-Low NOx emissions testing and monitoring in one simple analyser using a Chemiluminescence Detector (CLD)



Sensing Technology


The versatile SERVOPRO NOx gas analyzer uses the time-proven Chemiluminescence detection method to measure NO or NO/NO2/NOx concentrations all in one analyzer – perfect for continuous monitoring for industrial stationary sources emissions or ambient air, and fast enough for emissions testing in engines and vehicles.

The analyzer uses ozone (O3) which reacts with the nitric oxide (NO) in the sample stream, yielding an excited state of NO2 (NO2*) plus oxygen (O2). Excited NO2* will return to a more stable ground state, and in the process, produces a chemiluminescent light, the intensity of which is proportional to the concentration of NO that was converted into NOwithin the reaction chamber. A photodiode detector is used to measure the light and reports out a ppmv NO value. 

In order to produce a total NOx signal, the sample is first routed through an internal converter that turns any NOin the sample into NO. This stream is then subjected to O3 gas and the resultant reaction is now directly proportional to the total NOx concentration. The analyzer then makes an internal calculation, deriving the final NO2concentration from the NOx converter efficiency

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  • Continuous emissions monitoring (CEMs)
  • Ambient air monitoring
  • Scrubber efficiency
  • Combustion efficiency
  • Turbine/generator feedback control
  • Process gas analysis
  • Vehicle emissions
  • Engine testing
  • SCR/SNCR feedback control



Ensure your SERVOPRO NOx analyzer delivers optimum performance with Servomex Service Network.

Through our global network of engineers and service centers, we provide complete lifetime support for your analyzer. Our services range from installation and commissioning to supplying high quality spares and arranging scheduled servicing: visit our Service Network pages to find out more.