Refractometric Dry Substance (RDS)

Measure RDS for ICUMSA and more 

The sugar content of a solution obtained by use of refractometry with the ICUMSA table is often reported as “Refractometric Dry Substance” (RDS) which could be thought of as an equivalent sucrose content. Where it is desirable to know the actual dry solids content, empirical correction formulas can be developed based on calibrations with solutions similar to those being tested. For example, in sugar refining, dissolved solids can be accurately estimated from refractive index measurement by the Schmidt + Haensch iPR Series.

Suggested Products

The ATR BR is no longer available. There will be a successor model from SCHMIDT + HAENSCH as of 2023.


Compact Refractometer

iPR B3

Inline Brix Refractometer

Hygenic Design Process Refractometer


Inline Process Refractometer with Certified Hygienic Design

iPR C2

Compact Inline Process Refractometer


Full-range inline measurements


VariRef – Refractometer

Full-range Refractometer

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