Engine emissions

The exhaust gas from combustion engines is a complex mixture of gases and particulate matter. The composition of the gas may change rapidly. Multicomponent analysis of exhaust gases can be performed with Gasmet™ FTIR Gas Analyzers designed for continuous emission monitoring. Gasmet analyzers are ideal tools to analyze trace concentrations of pollutants in wet, corrosive gas mixtures. The sample cell can be heated up to 180 °C. Sample cell absorption path length is selected according to the application.

Gasmet EEMS (Engine Emissions Monitoring System) has a CX4000 analyzer with special small volume sample cell, a fast data transfer using RS422 protocol, and a powerful pump inside the sampling system. These factors contribute to a fast response time. The analyzer, sampling system and computer can be assembled on a cart for use in a dynamometer laboratory, or the portable version can be used for roadside tests.

Typically analyzed components (up to 50 components active at a time) include:

  • Water vapor H2O
  • Carbon monoxide CO and carbon dioxide CO2
  • Nitrogen oxides NO and NO2
  • Water-soluble gases such as sulfur dioxide SO2, hydrogen chloride HCl, and ammonia NH3
  • Isocyanic acid HNCO
  • Speciated hydrocarbons (up to C8)
  • Speciated BTEX (Benzene, Toluene, Ethylbenzene, Xylenes)
  • Other volatile organic compounds (VOC’s) such as alcohols, aldehydes, methyl tert-butyl ether (MTBE)



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