The new PAS 87 analyser is a sub-ppb Ammonia (NH₃)
monitoring system dedicated to atmospheric pollution
monitoring. This robust ammonia analyser offers reliable online
measurements in remote locations such as air quality monitoring
stations.

Environmantal applications. Ammonia has been recognized as an atmospheric pollutant in Europe since the 1979 Convention on Long- Range Transboundary Air Pollution. In the environment, the presence of acids, ammonia and water leads to the formation of ammonium salts such as Ammonium nitrate (NH₄NO₃) or Biammonium sulfate ((NH₄)₂SO₄) which greatly contribute to the NHx load and in the formation of inorganic secondary aerosols (an important component of fine dust - PM10). High temporal measurement of NH₃ is needed for validating Long Range Transboundary Air Pollution (EMEP) models and could lead to an improvement of the NHx transportation and deposition models. With the growing concern about climatic changes, ultra sensitive and accurate measurement of ammonia from sub-ppb to several ppm in the air has become an increasing concern.

User friendliness.
The development of an ECO PHYSICS analyser always includes full user comfort. The user can adapt the operation according to his needs and applications by selection of predefined settings. The user-friendly graphical interface for the operation and configuration of the system enables easiest set up and daily routine work. Long term stability through automatic drifts compensation, featuring zero level re-adjustment, and offering sub ppb accuracy over unlimited period of time.

A fascinating technology. The analyser is not only a state-of the-
art product in terms of precision and reliability. Its technological base
also sets the trend for others. It has been designed to be integrated as a standalone instrument in field monitoring networks, allowing several months autonomous and remote control operations.
The PAS 87 has been qualified and tested through US EPA Environmental Validation Test program, EMPA as well as independent monitoring networks through Europe.