The 900 ADA uses high-resolution ultraviolet (UV) technology in a dual-beam, multiple-wavelength configuration. A resolution of better than 0.02nm is provided by high-intensity, line-source lamps. These sources emit at a fixed wavelength and provide great measurement stability. The high resolution enables unparalleled linearity over a wide dynamic range (<1% deviation over 4-5 orders of magnitude). This unit is ideally suited for extreme climates where a shelter for personnel is required or where there are constraints to mount a ‘top of the pipe’ (AMETEK type 88) tail gas analyzer.