Krüss refractometer
Digital refractometers – Maximum accuracy in refractive index and concentration measurement
KRÜSS DR series – Digital refractometers for precise refractive index and concentration measurement
KRÜSS DR series digital refractometers are designed for the rapid, high-accuracy determination of refractive index (RI) and various concentrations. The stable optical system, high-resolution sensors and integrated Peltier-based temperature control ensure reproducible, reliable measurement results—even for temperature-sensitive samples.
The instruments are an ideal solution for the food, beverage, pharmaceutical and chemical industries, where measurement accuracy and process stability are essential requirements. The DR series automatically calculates the most commonly used parameters, such as Brix, refractive index and various concentrations, and also allows the use of user-defined scales.
The modern 7.0-inch capacitive touchscreen and intuitive user interface ensure easy operation. The instrument features a chemically resistant sapphire measurement prism and a stainless steel sample chamber, providing durability, easy cleaning and hygienic operation. It also supports the connection of an external keyboard, mouse and barcode scanner, enabling seamless integration into laboratory and production environments.
The system features factory-calibrated measurement optics and stable temperature control, providing high accuracy across the specified measurement range. LIMS compatibility, exportable measurement data and expandable software functions effectively support quality-assurance processes.
General overview:
| Feature Model | DR7100-P | DR7200-P | DR7300-P | DR7400-P |
|---|---|---|---|---|
| Measurement range | nD 1.3000 – 1.5800 0-95 %Brix |
nD 1.30000 – 1.72000 0-95 %Brix |
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| Accuracy | nD ±0.0001 ±0.1 %Brix |
±0.00002 ±0.02 %Brix |
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| Resolution | nD 0.0001 0.1 %Brix |
nD 0.00001 0.01 %Brix |
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| Temperature compensation | Automatic temperature compensation for %Brix measurement in accordance with the ICUMSA standard Custom temperature-compensation curves can be created by the user |
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| Temperature control | Integrated Peltier element | |||
| Temperature range and accuracy | 10 – 60 °C ±0.1 °C |
10 – 80 °C ±0.03 °C |
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| Temperature measurement, accuracy and range | Integrated Pt100 sensor ±0.1 °C 10 – 80 °C |
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| Measurement time | ~ 2 s | |||
| Prism | Sapphire | |||
| Sample volume | ~ 0.3 ml | |||
| Light source | LED 589 nm | |||
| Display | 7.0-inch capacitive touchscreen with 800 × 480 pixel resolution | |||
| Audit trail | No | Yes | No | Yes |
| Interfaces | 2x USB (2.0; type A); 1x RS-232; 1x LAN; 1x AUX | |||
Additional available Krüss refractometer types
In addition to digital laboratory refractometers, Krüss offers several other measurement solutions, ensuring that the right instrument is available for every application:
Fully automatic DR6000-TF digital refractometer
Automatic sample introduction, cleaning and drying ensure maximum efficiency and accuracy. Ideal for high-throughput laboratory and at-line production applications.
Digital handheld refractometers (Digital Handheld Refractometers)
Compact, portable instruments for rapid on-site Brix and concentration measurement. Ideal for testing in the food, beverage and agricultural sectors.
In-line refractometers (Process Refractometers)
Industrial in-line measurement systems that monitor concentration and refractive index in real time during production processes. Ideally suited to the chemical industry, food production and pharmaceutical environments.
Handheld optical refractometers (Hand Refractometers)
Easy-to-use, conventional optical refractometers for rapid verification measurements. A reliable, cost-effective solution for teaching, quality control or field testing.
Get in touch, and we will help you choose!
