Model 3000 DOAS is a continuous monitor designed to measure flue gases for both compliance and process monitoring. The Controller uses a Differential Optical Absorption Spectrometer (DOAS) System for unsurpassed accuracy and performance. The measurements are made in-situ across the stack or duct in a single pass design. A Windows based software package is available to display the data on either a Host laptop PC or the client’s existing data acquisition system.