Digital refractometers without internal temperature control


Refractometer DR6200 with temperature compensation - temperature control possible with thermostat

Refractometer DR6200 with temperature compensation - temperature control possible with thermostat

Refractometer DR6000 with circulating themostat PT80

Refractometer DR6000 with circulating themostat PT80

Key features
Key features

DR6000 - Specialists for sugar containing solutions

The DR6000 models are especially suited for highly accurate measurements of products from the sugar industry. Instead of temperature control, the temperature compensation according to ICUMSA can be used. The digital refractometer models DR6000 without internal Peltier temperature control are especially suited for highly accurate measurements of products from the sugar industry. Instead of the temperature control, you can use the temperature compensation according to ICUMSA. There are four model variants available for the different requirements on accuracy, resolution and measuring range, whereby the same operation and functionality can be accessed.

  • Measuring all sugar containing samples
  • Built-in thermostat connections for temperature control with external circulating thermostat
  • Preinstalled and freely definable scales with conversions bases on tables or formulas
  • Chemical-resistant materials such as measurement prism made of sapphire, measuring tray made of stainless steel
  • Intuitive operation via state-of-the-art touch-screen display
  • Complete data recording and backup including audit trail
  • Flexible data export
  • Compliance with global standards and norms

Typical applications

The refractometers of the DR6000 models are the ideal solution for the sugar industry

  • Determination of the sugar concentration in semi-finished products and end products
  • Determination of the solids content in solutions
  • Determination of the purity in combination with a polarimeter

For a comprehensive overview of typical applications using the DR6000 Series of Digital Refractometers, visit our campus review Refractometer applications.


Conformity with national and international standards

Refractometers are also designed and used in accordance with standards. Standards in refractometry regulate, under the aspect of “best practice”, the environmental conditions and sample preparation as well as measurement tolerances, properties and equipment features of a device or certificates of calibration equipment and testing instruments. Whoever uses refractometers according to normative specifications can guarantee that measurements are correct and work according to reproducible procedures.

In order to make it easier for you to choose the right refractometer for your application, you will find for free download an overview of all standards and guidelines known to us in which refractometry is referred to.

Refractometer standards (PDF, 106 KB)

Any questions?
Get in contact with us, we will assist you in choosing the right refractometer for you.


All samples are measurable

From bright to dark, from basic to acidic, from a low to a high viscosity – for our refractometers almost all samples are measurable. A high-quality optics, intelligent evaluation logarithms and a powerful LED enable the measurement of particularly challenging samples. These include z. For example, non-homogeneous samples such as fruit juices containing pulp, opaque samples such as heavy oils or emulsions that are common in cosmetics. Aggressive acids and bases can be easily measured using a chemical-resistant stainless steel measuring tray and a sapphire prism.

In order to serve the existing variety of samples and the wide range of applications, we offer a wide range of different refractometers. For the selection of the suitable refractometer, it is helpful to define the required measuring range.

In the following table we have compiled an overview of typical samples from our customers and sorted them by refractive index. Most samples were measured at standard measurement conditions (20 ° C, λ = 589 nm), deviations are indicated. The measurements given are not specifications.

For your free download:
(All values have been compiled with best accuracy, but this information is supplied without liability.)

Refractometer samples (PDF, 196 KB)

Any questions?
Get in contact with us, we will assist you in choosing a suitable refractometer.

Model specifications

SCALESRefractive index (nD)
Concentration of sucrose, glucose, fructose and invert sugar [%Brix],
MEASUREMENT RANGE nD 1.3200–1.5800
0–95 %Brix
nD 1.3200–1.7000
0–95 %Brix
nD 1.32000–1.58000
0–95 %Brix
nD 1.32000–1.70000
0–95 %Brix
±0.1 %Brix
nD ±0.00002
±0.02 %Brix
0.1 %Brix
nD 0.00001
0.01 %Brix
TEMPERATURE CONTROLWithout a sample temperature control, you can connect a thermostat for the temperature control
(ICUMSA or freely definable)
TEMPERATURE MEASUREMENTWith integrated temperature sensor Pt100

Technical data refractometers (PDF, 304 KB)

A strong performance package

A.KRÜSS digital refractometers set new standards in many respects. They deliver fast and reliable measurements, intuitive operation, seamless data logging, flexible data export and compliance with global standards. These and many more features make for a comfortable user experience.


Intuitive operation

  • State-of-the-art touch-screen display
  • Uniform operation of all A.KRÜSS laboratory devices
  • Displays measured value in two measurement units
  • Freely assignable speed buttons for the most important functions
  • Easy to understand, menu-guided adjustment
  • Sechs Sprachen auswählbar (de, en, es, fr, it, pt)

Fast reliable measurement

  • Measurement of even turbid or highly viscous samples
  • Measurement with manual measurement time input or optimized measurement time thanks to automatic stability recognition
  • Multiple measurements with averaging
  • Statistical analysis

Easy filling and cleaning

  • Small sample volume approx. 0.3 ml
  • Manual, semi-automatic or fully automatic sample supply
  • Chemical-resistant materials such as measurement prism made of sapphire, measuring tray made of stainless steel
  • Freely configurable cleaning processes (for devices with flow through functions)
  • Semi-automatic or fully automatic drying (optional)

Unlimited number of methods

  • Measurement modes: single, continuous or interval measurements
  • Method parameters such as scales, temperature, temperature compensation, sample supply, limit values, comments
  • Alarm option for monitoring the limit values of standards and samples
  • Pre-defined scales such as %Brix sucrose, %Brix invert sugar, %Brix glucose, %Brix fructose
  • More than 100 additional scales available on request
  • Any number of freely definable scales with conversions based on tables or formulas such as m%, Vol.-%, g/cm³, °Oe, dry substance, salinity and %BRIX

Intelligent user administration

  • Can be activated or deactivated as required
  • Different authorisation levels
  • Setup of user profiles
  • Customized settings for diŽerent users or work groups

Complete documentation of measured values

  • Records all measured data as well as system or method selections in a tamper-proof measured data storage
  • Audit trail for logging configuration changes
  • Data reports with own logo

Flexible data export

  • Print-out on serial ASCII printer (real paper)
  • Print-out on network printer in PDF or PS format
  • Print-out as PDF on USB flash drive or to network share
  • Export in HTML or CSV format on USB flash drive or to network share
  • Can be connected to a keyboard, mouse, barcode scanner or external PC in order to use the KrüssLab
  • Easy integration into existing networks (DHCP-Client) or a LIMS

Temperature control as required

  • With internal Peltier temperature control
  • With external thermostat temperature control
  • Temperature compensation

Compliance with global standards

  • 21 CFR Part 11
  • Pharmacopoeia (USP, BP, JP, Ph. Eur.)

Automation with refractometers

The DR6000-TF models with through-flow function, flow-through cell, drying unit DS7060, peristaltic pump DS7070 and autosampler AS80 or AS90 allow for semi- or fully automated operation.

more about automation

Temperature control via circulating thermostat

If needed, our DR6000 models can also be temperature-controlled using an external circulation thermostat. The built-in thermostat connections allow you connect, for example, our PT31 or PT80 in next to no time; both are circulation thermostats with built-in Peltier technology. A temperature sensor integrated into the refractometer displays the current sample temperature which can be regulated via the connected circulation thermostat. In this way it is possible to measure nearly all liquids and pastes also with the DR6000 models when the temperature influence on the measurement value is not known and the temperature compensation can not be used.

Circulating thermostat PT80

Any Questions?

We will be glad to help.

A.KRÜSS Optronic GmbH
Alsterdorfer Str. 276-278
22297 Hamburg | Germany

Tel. +49 40 5143 17-0
Fax +49 40 5143 17-60