The Icon Cetane Number analyzer provides refineries with quick and accurate cetane number measurements without the drawbacks of traditional CFR Engines or the issues associated with model-based chemometrics used in FTIR and Raman spectrometers, and works with both Diesel and Biodiesel products. It is the first and only online process analyzer in the world to measure cetane number, and won the coveted ISA Analysis Division Innovation Award in its first year of launch. The analyzer measurements correlate to all other ASTM cetane number methods such as D613, D6890, D7668, and include the effects of Cetane improvers thus enabling real-time control of a diesel blending plant. The analyzer is also designed to be complimentary to lab-based cetane number measuring instruments thus making bias management more straightforward. The Icon Cetane Number analyzer uses a constant volume combustion chamber with direct fuel injection into heated compressed air. A dynamic pressure wave is produced from the combustion of the sample from which ignition delay (ID) and combustion delay (CD) can be determined. Built-in equations allow for calibration curves using either one of ID or CD to predict a derived cetane number (DCN).