For use in classified hazardous plant environments, the RamanRxn3 analyzer from Kaiser Optical Systems Inc. is a Class 1, Div. 1 Raman system with multichannel capability. Incorporating advanced detector technologies, an Invictus 785-nm laser and HoloPlex holographic technology, the system simultaneously collects full-spectral data at high resolution. Protocols permit the calibration transfer of chemical models developed in the laboratory to both pilot and production reactors. Fiber optic coupling enables real-time, in situ analysis of sample volumes ranging from 5 ml to 5000 gal.