Optilab® UT-rEX™ Refractive Index Detector for UHPLC

The Optilab® UT-rEX (UHPLC refractometer with EXtended range) is the first RI detector especially designed to be used with any UHPLC system. It works alone as a universal concentration detector, or in combination with the Wyatt µDAWN multi-angle light scattering (MALS) detector or to measure absolute molar mass and size of macromolecules and nanoparticles in solution, via µSEC-MALS. Combined with the µDAWN, the UT-rEX can measure macromolecules and nanoparticles from 10-50 nm in size and 200 Da – 10 MDa in molar mass.


  • Range: -0.0047 to +0.0047 RIU
  • Sensitivity: 1.5x10-9 RIU
  • Temperature control both above and below ambient, from 4°C - 65°C
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