Gravimetric Sorption Analyzer - IsoSORP®

Sorption Analysis under extreme conditions

The heart of the IsoSORP® Sorption Analysis instruments is the Magnetic Suspension Balance for accurately weighing the sample material. Rubotherm’s patented Magnetic Suspension Balance allows highly accurate weight measurements of samples in closed vessels to be performed. The sample is weighed from the outside and the suspension force is contactlessly transmitted from the pressurised measuring cell to a microbalance at ambient atmosphere. This means that the sorption ability of a sample in a closed reactor can be analyzed even under extreme conditions like high pressure and/or toxic atmospheres with the utmost accuracy.


Unique features of the Magnetic Suspension Balances Technology - used in all IsoSORP Instruments

  • Contact free weighing under extreme conditions

    The patented magnetic suspension coupling allows weighing in hermetically closed reactors. By separation of measurement area (sample) and weighing area (balance), damage or contamination of the balance caused by process media or experimental conditions can be avoided. The reactor is completely metal sealed and heated so that even highly aggressive or corrosive fluids or vapors can be used over a wide pressure and temperature range.
  • Excellent long term stability

    The sample can be automatically disconnected from the balance at any time to re-tare or recalibrate the balance. Afterwards, the sample is reconnected to the balance and the measurement continued. This way, high precision long term measurements can be performed without any baseline drift or accuracy loss.
  • Simultaneous density measurement

    With IsoSORP instruments the sample weight and the density of the process fluid can be determined in a single measurement. This is achieved by weighing a titanium sinker as second inert sample.
  • Modular construction

    The Magnetic Suspension Balance can be easily adapted to new applications. Existing instruments can be updated with many functional modules. A large number of custom configurations has already been realized.
Gravimetic Sorption Analyzers Detail - IsoSORP

Technical Versions

The IsoSORP® instruments can be equipped with different versions of the Magnetic Suspension Balance with the following specifications:

Magnetic Suspension Balance Type Resolution Dynamic Weighing Range (Sample Mass)
A 10 0.01 µg 200 mg
A 100 0.1 µg 1 g
E 1 1 µg 10 g
E 10 10 µg 25 g

Application Examples for IsoSORP Sorption Analyzer

  • Adsorption Isotherms and Kinetics
    by Gas Physisorption and Chemisorption Measurements with Catalysts, Zeolites, Activated Carbon, Clay, Silica, Molecular Sieves
  • Surface Area and Porosity
    by Gas Physisorption, Density and Buoyancy Measurements with Catalysts, Zeolites, Activated Carbon, Clay, Silica, Molecular Sieves
  • Absorption and Solubilities
    by Gas Solubility Measurements in Polymers, Liquids and other Materials
  • Gas Storage
    Gas Storage Capacity Measurements with New and Classical Materials (Metal Organic Frameworks, Metal Hydrides, Carbon Nano Tubes, Ionic Liquids)
  • Diffusion and Permeation
    Measurements of Diffusion Coefficient of Ad- / Absorption Processes of Gases and Mixtures
  • Separations
    Measurement of the Selectivity of Mixed Gas Sorption
  • Temperature Programmed Desorption
    Determining Binding Energies or Heat of Adsorption by Desorbing Loaded Sample Material at Elevated Temperature
  • Thermogravimetry
    Introduction of new application areas for TGA by measurements under high pressure or with aggressive fluids and vapors.
  • Vapor Permeability and Diffusivity
    Measurements of Membranes, Packing Materials, Blisters and Foils
  • Wetting and Drying Processes
    of Pharmaceuticals, Construction Materials and Solid Fuels
  • Corrosion Studies
    of Alloys for High Temperature Applications in Power Plants or Gas Turbines
  • Filter Material Testing
    by Measuring the Capacity and Selectivity for Pollutants
  • Incineration or Conversion of Toxic
    Biological and Chemical Materials by High Temperature and/or High Pressure Vapor
  • Catalyst
    Sulphidation Processes, Coking and Lifetime Testing

Contact Us

Details about IsoSORP® Sorption Analyzers are provided on the subsequent pages. The IsoSORP® Series of instruments is customizable to a wide extend.

Contact us to discuss your research needs