Refractometry

Measuring Refractive Index of a medium with the Steuma refractometer
Steuma’s optical principle is based on measuring the reflected light intensity which is linear to the refractive index in the area of total reflection close to the critical angle. Using a light beam with a diameter of 40 mm, a large prism, lenses and mirrors, it is possible to achieve high sensitivity to measure minimal variations of concentrations in a process medium.
As a result there is no ‘grey zone’ which causes inaccuracies with other refractometers. Stability is achieved by its patented principle of the reference light beam (not shown in the schematic).
This reference compensates for all physical changes due to temperature differences between optics, process liquid and surrounding areas. IR-source and IR-sensors are temperature stabilized.
The process temperature is measured and is used to calculate the concentration of the process.

  • Applications
    Food and Beverage: measuring soft drinks and juices, beer, applesauce, syrups, alcohol-distillation processes, etc.
  • Chemical and Petrochemical: Teflon plunge bath, PVA, ammonia, cooling- and lubrication liquids, gelatines, urea, DMAC/DMF fibers, siliconenbath, plastic foil-extrusion, CMC, CMS textile sizing, etc.
  • Mining: Hydraulic liquids, cutting oil production, etc.

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