PEMS Module for the Quantification of Ammonia


The SEMTECH® NH3 module is the newest addition to the DS+ PEMS product family.

It measures NH3 concentration in raw exhaust from gasoline or diesel vehicles or non-road equipment using tunable diode laser (TDL) spectroscopy. In order to prevent loss of NH3, the sample is measured “wet” (without removing any of the water vapor from the exhaust) with a heated line and sampling system.

A special heated filter and drain system protects from accidental liquid contamination in the TDL bench, which is always a risk when performing cold start testing.

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