PR21 Process Refractometer

PR21 Industrial Online Refractometer

Stock Status: In Stock


Krüss offers two models of Process Refractometers in the PR21 series. The PR21 has been developed for direct insertion into pipes and boilers, for process monitoring, control and separation of products in such industries as chemicals, beverages, food, pulp, paper, and sugar. Installation in a pipeline or tank is simple, as no bypass is necessary. Three interfaces are available for this unit: Analogue 0/4-20 mA, Ethernet, or PROFIBUS.

Order Information

PR21S Online Process Refractometer Basic

PR21S-T Online Process Refractometer Basic High Temperature (sample temperature < 160 °C)

PR21H Online Process Refractometer High Accuracy

PR21H-T Online Process Refractometer High Accuracy High Temperature (sample temperature < 160 °C)

[Measurement mode]: Refractive index [nD], Sugar content [%Brix], User defined [%]
[Measurement interval]: 3–60 s
[Temp. sensor]: PT100
[Temp. measurement]: -10–200 °C
[Temp. resolution]: 0.1 °C
[Temp. measurement accuracy]: ± 0.2 °C
[Temp. compensation]: ICUMSA, arbitrary
[Process temperature]: -5–160 °C
[Ambient temperature]: 0–60 °C
[Prism]: Sapphire
[Illumination]: LED 590 nm (est. life
[Housing]: Stainless steel, Cast aluminium, powder-coated
[Interfaces]: Analogue 0/4-20 mA, Ethernet, PROFIBUS (optional)
[Protection class]: IP65
[Working voltage]: 24 V
[Dimensions in cm]: 18.0 x 19.0 x 18.0
[Weight]: 3.5 kg
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