Abstract: An infra red spectrometer incorporates a flow cell connected to a process line containing sugar to provide continuous sugars measurements. The optical components and lamp are selected to operate in the range of 1800 nm to 2500 nm. The absorption at two wavelengths are used to calculate sucrose concentration. Absorbance at one of the wavelengths is independent of sugars concentration so that the difference between the two is indicative of sugar concentration. The method is applicable to both beet and cane sugars as well as any food processing system which requires monitoring of sugar concentrations.