Refractometer DR6000-TF

Digital Refractometers with Automation. An optional solution for high sample volume.

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Maximum efficiency with automation

The DR6000-TF models with flow-through measuring cell enable fully automatic operation in combination with drying unit, peristaltic pump and autosampler. There are four model variants available for the different requirements for accuracy, resolution and measuring range, whereby the same operation and functionality can be accessed.

  • For continuous measurements or series of measurements with high sample volumes
  • For low-viscous to slightly viscous samples
  • With highly accurate internal Peltier temperature control
  • Preinstalled and freely definable scales with conversions based 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 touchscreen display
  • Complete data recording and backup including audit trail
  • Flexible data export
  • Compliance with global standards and norms

Typical applications

The DR6000-TF models are the ideal solution for manufacturers of flavors, fragrances and essential oils, as well as for the pharmaceutical and beverage industries.

  • Routine analysis with high sample throughput
  • Quality control of raw materials and auxiliary materials
  • Monitoring of the production of semi-finished products and end products
  • Quality and purity control of raw materials and end products
  • Determination of the sugar concentration in juices and alcohol-free beverages
  • Determination of the alcohol or extract content in beer, spices, wine or spirits

Conformity with national and international standards

A big advantage of normalized measurements is the comparability of the measurement results. Refractometers for specific measuring tasks are recommended as suitable measuring instruments in many international standards and guidelines. The requirements for the measuring devices, such as measuring accuracy and measuring temperature, are dependent on the respective measuring task and defined in each standard. We have compiled for you an overview of all known standards and guidelines, which refer to the refractometry.

Association of Analytical Communities (AOAC)
American Oil Chemists’ Society (AOCS)
American Society for Testing and Materials (ASTM)
German Institute for Standardization (DIN)
International Organization of Legal Metrology (OIML)
International Organization of Vine and Wine (OIV)
International Commission for Uniform Methods of Sugar Analysis (ICUMSA)
International Organization for Standardization (ISO)
United States Pharmacopeial (USP)
European Pharmacopoeia (Ph. Eur.)
European Honey Commission (EHC)

All samples are measurable

The DR6000-TF models are used for low-viscous to slightly viscous and valuable samples such as essential oils, cosmetics and sugar concentrates. Semi or fully automatic sample supply is the ideal solution for high sample volumes or harmful samples. It improves the reproducibility of the measurement results and saves costs since the peristaltic pump only draws the required sample volume into the measuring cell.

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.

Semi-automatic sample supply

The semi-automatic operation requires the DR6000-TF models with flow-through function, flow-through measuring cell, drying unit DS7060 and a peristaltic pump DS7070, which draws the sample or the cleaning agent into the measuring cell. Thanks to the 3/2-way valve of the drying unit, you do not need to interchange the tubes when switching from the sample supply or the cleaning to the drying.

Fully automatic sample supply

The DR6000-TF models with through-flow function, flow-through measuring cell, drying unit DS7060, peristaltic pump DS7070 and autosampler AS80 or AS90 allow for a fully automated operation. The samples are taken from the vials of the autosampler and drawn into the measuring cell by the pump. If needed, the system can be automatically rinsed and dried after each measurement.


AS80 and AS90 – Laboratory automation for high sample volumes. You will find further information on our autosamplers such as an overview of possible applications, a selection of sample plates or accessories required on the product page of the autosampler.

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

Inteligent unser administration

  • Can be activated or deactivated as required
  • Dierent authorisation levels
  • Setup of user profiles
  • Customized settings for dierent 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.)
SCALESRefractive index (nD)
Concentration of sucrose, glucose, fructose and invert sugar [%Brix],
MEASUREMENT RANGEnD 1.3200–1.5800nD 1.3200–1.7000nD 1.32000–1.58000nD 1.32000–1.70000
0–95 %Brix0–95 %Brix0–95 %Brix0–95 %Brix
ACCURACYnD ±0.0001nD ±0.00002
±0.1 %Brix±0.02 %Brix
RESOLUTIONnD 0.0001nD 0.00001
0.1 %Brix0.01 %Brix
TEMPERATURE MEASUREMENTWith integrated temperature sensor Pt100
TEMPERATURE CONTROLWith integrated Peltier temperature control
(ICUMSA or freely definable)

Melting Point Meter for Semi-Automatic Measurements. The M3000 provides fast and easy examination of powdery substances with a melting point up to 360°C.

Melting point meter for automatic measurements. The M5000 provides fast, easy and automatic examination of powdery substances with a melting point up to 400 °C.

Density meters for manual sample supply Set 1 / Set 2.  The right decision for low sample volumes.

Density meters for semi-automatic sample supply Set 3. High efficiency and special suitability for hazardous substances.

Density Meters DS7800 for Full-Automatic Sample Supply(Set 4 / Set 5). Fully automatic execution of the entire measuring process.

Digital Refractometers without Temperature Control. Specialists for sugar containing solution.

Digital Refractometers with Peltier Temperature Control. Allrounder for measuring all liquid and pastes.

Digital Refractometers with Automation. An optional solution for high sample volume.

Abbe Refractometer Analog(AR4) – Refractive index and % Brix can be measured and read via an eyepiece.

Digital Abbe refractometer (AR2008) – Refractive index and % Brix can be measured and displayed digitally.

Digital Handheld Refractometers DR101-60, DR201-95 and DR301-95. Digital on-site measurements at the touch of a button.

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