Optilab ™ and microOptilab ™ refractive index (dRI) detectors are utilized primarily for on-line measurement of analyte concentration in SEC-MALS and FFF-MALS, and for determination of analyte dn/dc (refractive index increment), and the absolute refractive index (aRI) of solvents.

Also useful for automation of Zimm plots, dn/dc analysis, reaction kinetics and polymer interaction analyses.

https://www.wyatt.com/products/instruments/on-line-refractometers-sec-mals.html