Density meters for fully automatic sample supply

Set 4 / Set 5

Density meter DS7800 with autosampler for fully automatic sample supply

Density meter DS7800 with autosampler for fully automatic sample supply

Autosampler AS90

Autosampler AS90

Peristaltic pump DS7070

Peristaltic pump DS7070

Key features
Key features

Fully automatic execution of the entire measuring process

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. For a high sample volume of aggressive samples we recommend Set 5.

  • Suitable for low-viscous to slightly viscous and aggressive samples
  • Fully automatic sample supply and cleaning
  • Fully automatic drying
  • Individual measurement methods and cleaning procedures as well as sampler templates possible
  • Easy and fast to install autosampler
  • Intuitive operation via touch-screen display
  • Easy, menu-driven adjustment
  • Pre-defined scales such as density, relative density, brix, alcohol and sulfuric acid concentration
  • Compliance with GMP/GLP, 21 CFR Part 11, pharmacopoeias (USP, BP, JP, Ph. Eur.), FDA, ISO, HACCP, OIML, ASTM, ICUMSA, NIST

Typical applications

A comprehensive quality assurance covering the entire production process is a must in any industrial sector. Density measurements are frequently used for this purpose, especially in the pharmaceutical, chemical, petrochemical as well as the food and beverage industry. They allow the manufacturer to analyse raw materials, semi-finished and finished products as well as the manufacturing steps in terms of a number of factors.

Density can be used to identify substances, to determine their quality or purity and to measure their concentration in binary or quasi-binary mixtures. Substance conversions and reaction dynamics can also be inferred from it. In combination with other methods such as refractometry that measures the refractive index of substances, the density measurement allows you to make precise statements about the quality of each step of the production process.

Density meters based on the oscillating U-tube method are characterized by high ease of use and are therefore used in particular for continuous density measurement and for rapid routine measurements with larger numbers of samples in laboratories.

More information about typical applications of density meters can be found in our campus article about density meters – fields of application


Compliance with national and international standards

A big advantage of normalized measurements is the comparability of the measurement results. Many international standards and guidelines recommend density meters for specific measuring tasks as suitable measuring instruments. The requirements for the measuring devices, such as measurement 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 density measurement.

  • American Society for Testing and Materials (ASTM)
  • Hazard Analysis and Critical Control Points (HACCP)
  • International Organization of Legal Metrology (OIML)
  • National Institute of Standards and Technology (NIST)
  • International Commission on Uniform Methods of Sugar Analysis (ICUMSA)
  • European Pharmacopoeia (Ph. Eur.)
  • United States Pharmacopeia (USP)

Density Meters Standards (PDF, 78 KB)

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


Density measurement of liquids, emulsions and pastes

Thanks to the chemical-resistant sample carrying parts made of borosilicate glass and PTFE, our density meters are suitable for almost all liquids, emulsions and pastes.

The sample is administered manually via syringe, semi-automatically via peristaltic pump or fully automatically via autosampler. High-viscosity samples are usually supplied by syringe, low to light viscous can also be supplied by means of peristaltic pump and autosampler. For every method of operation and every kind of sample, we have suitable density meter sets available that contain all the necessary accessories, from tubing sets to filling spouts and adapters to splash guards for the manual supply of aggressive substances.

In the following table we have compiled an overview of typical samples from our customers. Most samples were measured with an measurement accuracy of 3 decimal places and at 20 ° C, deviations are indicated. The listed readings are not specifications.

Samples Density (PDF, 110 KB)

Any questions?
Get in contact with us, we will gladly assist you in selecting a suitable density meter for you.

Model specifications

SCALESDensity [g/cm³]
Relative Density
Brix [%Brix]
Concentration of alcohol [vol%]
Concentration of sulphuric acid [wt%]
MEASUREMENT ACCURACY±0.001 g/cm³±0.0001 g/cm³
MEASUREMENT PERIODTypically 1–3 minutes including temperature control
METHODSA practically unlimited number of methods can be set
ADJUSTMENTAutomatic (menu-driven), with dried air and distilled water
DS7700-4/DS7800-4Drying unit with 3/2-way valve DS7060
Peristaltic pump
Autosampler AS80 or AS90, each with 1 of 2 sample plate variants and matching polypropylene or glass vials
Tygon tube set for use with drying unit DS7060: suction tube, drain tube, air tube, waste tube, tube connections Luer
Tube set for peristaltic pump DS7070: TPE pump tubes, PTFE tube connections (olive)
Adaptor olive/UNFa for connecting the Tygon tubes to the drying unit DS7060
Adaptor UNFi/Luer for the sample supply with autosampler AS80 or AS90 via Luer nozzle
Luer nozzles
Luer syringes
PE waste container with lid
DS7700-5/DS7800-5Drying unit with 3/2-way valve DS7060
Peristaltic pump
Autosampler AS80 or AS90, each with 1 of 2 sample plate variants and matching polypropylene or glass vials
PTFE tube set for use with drying unit DS7060: Suction tube, drain tube, connecting tube, waste tube,PEEK hollow screws
Tube set for peristaltic pump DS7070: TPE pump tubes, PTFE tube connections UNF
Adaptor Luer/UNFa for the sample supply with syringe via UNF nozzle
UNF nozzles
Luer syringes
PE waste container with lid

Technical-data and overview consumables Density meters (PDF, 287 KB)

A strong performance package

A.KRÜSS density meters 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
  • Secondary scale for displaying a second measured value
  • Freely assignable shortcut keys for the most important functions
  • Easy, menu-driven adjustment
  • A selection of six languages (de, en, es, fr, it, pt)

Fast reliable measurement

  • Drying unit with regenerable silica gel for a highprecision adjustment
  • Efficient Peltier temperature control
  • Measurement with manual measurement time input or optimised measurement time thanks to automatic stability recognition
  • Preview of measured values updated every second

Easy filling and cleaning

  • Sample supply via syringe, peristaltic pump or autosampler
  • Including drop collector, splash guard optional
  • Reliable filling check via inspection glass
  • Chemical-resistant materials
  • Freely configurable cleaning procedures
  • Semi-automatic or fully automatic drying

Unlimited number of methods

  • Create any number of methods and analyse each sample using the desired parameters
  • Method parameters: scales, temperature, sample supply, limit values, comment and many more
  • Measurement modes: single, continuous or interval measurement
  • Predefined scales (density, relative density, Brix, concentration of alcohol and sulphuric acid)
  • Any number of freely definable scales with conversions based on tables or formulas

Intelligent user administration

  • Can be activated or deactivated depending on the requirements
  • Two authorisation levels
  • Optional setup of user profiles
  • Customised settings for different users or work groups

Complete documentation of measured values

  • Complete recording of all measured data as well as system and method settings in a tamper-proof data storage
  • Documentation of all measured values of the last 999 measurements with consecutive numbering

Flexible data export

  • Print-out on serial ASCII printer
  • Print-out on network printer in PDF or GS 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
  • Easy integration into existing networks (DHCP Client) or a LIMS

Denity meter solutions for any need

  • DS7700 with an measurement accuracy of         ±0.001 g/cm³ and
    DS7800 with an measurement accuracy of         ±0.0001 g/cm³
  • Set 1 for manual sample supply
  • Set 2 for manual sample supply, also of aggressive samples
  • Set 3 for semi-automatic sample supply
  • Set 4 for fully automatic sample supply
  • Set 5 for fully automatic sample supply, also of aggressive samples

Compliance with global standards

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

Automation with density meters

Working environments with high sample throughput need solutions for fully automated processing of the entire process from sample introduction to the cleaning and drying that are flexible, powerful and robust.

Learn more about automation with density meters

Our service is unbeatable

As a customer you are at the center of our service, and for your satisfaction we give our best every day. Quality is always our top priority. Whether commissioning, calibration, maintenance or repair: with our certified service and repair services, you can rely on the first-class expertise of our specialists.

Our certified services

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