The Model FTUV-NH3 gas analyser is an ammonia gas monitoring system specifically designed for stack emission, motor exhaust and gas manufacturer.

The measurement principle is based on the UV absorption spectrum of the ammonia gas (NH3) in the UV range.
The periodic structure of the absorption bands coming from the different levels of rotational energy of the gas molecules is analysed by performing a Fourier Transform on the absorption spectrum with a high speed DSP (Digital Signal Processor).