Diesel and Gasoline Refinary Feedstocks Blending to Produce an Octane on Spec! The ABB lab and process FTNIR spectrometers are analyzers that gives fast and reproducible measurements and the only spectrometer to use a global model that can be transfered from one analyzer to the other. The robust and FTNIR spectrometer construction is the same for the lab and the online analyzer. It measures the hydrocarbons; octanes(RON, MON), volume % aromatics, volume % benzene, volume % olefin, etc.