Benchtop 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. Kruss offers a range of benchtop density meters from automatic, and semi-automatic sample supply to manual systems
High efficiency and special suitability for hazardous substances
In case of low-viscous to slightly viscous samples, it is possible to perform a semi-automatic sample supply and cleaning of the U-tube oscillator using a peristaltic pump. This means higher efficiency and more safety if aggressive or harmful substances are analysed. It also improves the reproducibility of the measurement results.
- Drying unit and peristaltic pump with high chemical resistance
- 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
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.
The Density meter is 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 the 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 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 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 Meter 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 accuracy of 3 decimal places and at 20 ° C, deviations are indicated. The listed readings are not specifications.
|SCALES||Density [g/cm³] Relative Density
Brix [%Brix] Concentration of alcohol [vol%] Concentration of sulphuric acid [wt%] User-defined
|MEASUREMENT RANGE||0–3 g/cm³|
|ACCURACY||±0.001 g/cm³||±0.0001 g/cm³|
|MEASUREMENT PERIOD||Typically 1–3 minutes including temperature control|
|SAMPLE VOLUME IN CASE OF MANUAL INJECTION||0,9 ml|
|AMBIENT TEMPERATURE||10–40 °C|
|TEMPERATURE RANGE||10–40 °C|
|TEMPERATURE RANGE||±0.02 °C|
|METHODS||A practically unlimited number of methods can be set|
|ADJUSTMENT||Automatic (menu-driven), with dried air and distilled water|
|CONTENT SET 3|
|Drying unit with 3/2-way valve DS7060
Tygon tube set for use with drying unit: Suction tube, drain tube, air tube, waste tube, tube connections Luer
Tube set for peristaltic pump: TPE pump tubes, PTFE tube connections (olive),
PE waste containerBrochure