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Density meters of the DS7000 series

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Fast, reliable measurements using the oscillating U-tube method

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In close cooperation with industry and science, we have developed digital density meters with U-tube oscillators that best meet the requirements in terms of accuracy, speed, required sample volume and ease of integration into the manufacturing process. They have stood the test for many years in numerous companies and different sectors for quality control in the laboratory as well as at the production line.

Our DS7000 density meters are available in two versions – DS7700 and DS7800. Their only difference lies in the measuring accuracy and the type of drying unit; all other characteristics are identical. The devices are very robust, compact and yet precise and suitable for nearly all liquids, emulsions, pastes etc. thanks to the chemical-resistant parts made of borosilicate glass and PTFE that are in contact with the sample.

They feature a self-explanatory, well-arranged user interface, which makes it easy even for non-expert personnel to operate the device. A state-of-the-art TFT display ensures a clear, bright representation of all the information. The integrated touch-screen tops off the comfortable user experience.

Overview of our density meters

ACCURACY ±0.001 g/cm³ ±0.0001 g/cm³
MEASUREMENT RANGE 0–3 g/cm³ 0–3 g/cm³
Peristaltic pump
Peristaltic pump
  • 2/2-way valve
  • Semi-automatic drying – drain tube and air tube need to be interchanged
  • 3/2-way valve
  • Acid- and chemical-resistant
  • Fully automatic drying – tubes do not need to be interchanged
  • Semi-/fully automatic sample supply and cleaning
Optional Optional
  • Fully automatic sample supply via peristaltic pump DS7070
  • 2 types of sample plates:
    18 x 50 ml (42 mm x 43 mm)
    36 x 35 ml (28.1 mm x 65 mm)
Can be retrofitted
(requires drying unit DS7060)
  • Fully automatic sample supply via peristaltic pump DS7070
  • 2 types of sample plates:
    53 x 16 ml (22 mm x 55 mm)
    89 x 6 ml (16 mm x 55 mm)
Can be retrofitted
(requires drying unit DS7060)


Our density meters offer many advantages:

  • Self-explanatory, well-arranged user interface and touch-screen display
  • Optional user administration with two authorisation levels
  • Easy, menu-guided adjustment
  • Freely assignable shortcut keys
  • Freely configurable methods and scales
  • Concentration tables, for example, for sugar, sulphuric acid and alcohol; any number of tables can be added
  • Requires only a small sample volume
  • Measurements of highly viscous or very problematic samples with suspended matters, air bubbles etc.
  • Efficient Peltier temperature control
  • Measurements with manual measurement time input or optimised measurement time thanks to automatic stability recognition
  • Multiple measurements of a sample or identical samples with averaging
  • Traceability and reproducibility of all measured data
  • Interfaces for the convenient transfer of measured values
  • Chemical-resistant materials
  • Proper tube sets for any type of sample
  • Compliance with GMP/GLP and 21 CFR Part 11
  • IQ/OQ/PQ by A.KRÜSS Optronic or certified service partners
  • Service, maintenance, calibration and adjustment on site


Maximum efficiency through automation


Fully automatic sample supply via autosampler AS90

Fully automatic sample supply via autosampler AS90

Fully automatic solutions

Working environments involving a high sample throughput require flexible, powerful and robust solutions for a fully automatic execution of the entire process from the sample supply to the cleaning and drying. Our AS80 and AS90 autosamplers meet these high requirements. Together with the peristaltic pump DS7070, they allow for an unsupervised measurement of up to 89 samples.

You can create any number of individual measurement methods and cleaning procedures as well as sampler templates on the density meter’s user interface. The AS80 and AS90 models require very little space, are easy and fast to install and very durable.

The samples on the Autosampler’s rotating plate are removed successively by the suction needle and drawn into the U-tube oscillator by the peristaltic pump. If desired, the system can be automatically rinsed and dried after each measurement.


Semi-automatic sample supply via peristaltic pump

Semi-automatic sample supply via peristaltic pump DS7070

Semi-automatic solutions

The semi-automatic sample supply and cleaning of the U-tube oscillator with the peristaltic pump DS7070 – for low-viscous to slightly viscous samples – means improved efficiency and improved safety in case of aggressive or harmful substances. It also improves the reproducibility of the measurement results and saves costs as the peristaltic pump no longer requires a re-supply of syringes.

The drying unit DS7060 can make the drying fully automatic: It is connected to the peristaltic pump and the flow of the sample or cleaning medium as well as the drying air is controlled via its 3/2-way valve. The drying unit DS7050, which is fitted with a 2/2-way valve, is suitable for cleaning procedures via displacement without a subsequent drying.


Sample supply via syringe

Sample supply via syringe

Working manually

If work is performed manually, the sample and the medium for cleaning the U-tube oscillator will be supplied with a Luer syringe. While the sample is added, you can check for air bubbles by looking through the inspection glass. A suitable medium is injected for the cleaning until all sample residues have been dissolved and removed. The drying unit will then remove all liquid residues.


Our extensive range of services

Your benefits as an A.KRÜSS customer:
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  • IQ/OQ/PQ by A.KRÜSS Optronic or certified service partners
  • Service, maintenance, calibration and adjustment on site
  • Calibration and adjustment with certified calibration liquids
  • Training and application consulting on site
  • Spare parts and accessories directly from the manufacturer
  • Customer-specific customisation of devices
  • Efficient support thanks to a fast confirmability of the customer’s situation based on extensive reports


For prices and availability information on A.KRÜSS density meters, please contact your nearest Krüss distributor, who will be delighted to help.

PDF For full technical specifications, please download the brochure here.