Refractometer technology

The refractometer determines the concentration of dissolved solids by making an optical measurement of a solution’s refractive index (nD). The refractometer measures the refractive index nD and the temperature of the process medium. The measurement is based on the refraction of light in the process medium, called critical angle of refraction, using a yellow LED light source with the same wavelength (580 nm) as the sodium D line (hence nD).

The concentration is calculated based on the refractive index and temperature, taking pre-defined process conditions into account. the refractometer can indicate different scales, for example Brix, liquid density or concentration by weight. 

The multiple sensor can be connected to one User interface via Ethernet or 4 to 20 mA connection. However, there are different product models with different features for particular industrial applications, and each model is adapted for different industrial requirements.

Key Features: 

→ Universal calibration of each sensor: All sensors are freely interchangeable.
→ Full measurement range Refractive Index (nD) 1.3200 – 1.5300, which corresponds to 0-100 Brix/Conc.
→ Meets 3A Sanitary Standard and tested for CIP cleanability according to EHEDG.
→ Completely digital system: particles and bubbles do not affect operation or accuracy.
→ Patented CORE-optics: no drift, no re-calibration, no mechanical adjustments.
→ FDA 21 CFR Part 11 Compliance
→ USP Class VI Compliance
→ Effective heat transfer and isolation using Teflon® and ceramics in the sensor provide safe operation also in higher process temperatures (max. 130 °C/266 °F.
→ Fast process temperature measurement by built-in Pt1000 and automatic temperature compensation.
→ Calibration and accuracy traceability with easy on-site instrument verification using standard Refractive Index liquids.
→ ATEX approved for Zone II, area classification EX II 3 G EEx nA II T4.
→ ATEX approved for Zones 0 and 1, area classification ATEX II 1G Ex ia IIC T4 (only Intrinsically safe PR-23-AC-IA with single sensor transmitter STR).
→ FM approved for Class I, Div. 2, Groups A, B, C and D, T6.
→ CSA certified for Class I, Div. 2, Groups A, B, C and D, T4.
→ cCSAus certified for Electrical Safety, Sensor: Class I, Pollution Deg. 3; Transmitter: Class I, Pollution Deg. 2; Installation Cat. II.