Gravimetric Sorption Analyzer

Gravimetric Sorption Analyzer from UHV up to 1000 bar

Linseis offers a wide range of Gravimetric Sorption Analyzers (GSA). Our integrated solution offers the ability to independently software control the pressure, temperature and gas dosing. We offer two different balance mechanisms, a mechanically connected taught band microbalance and a Magnetic Suspension Balance offering a unique hermetically sealed reactor for highly reactive gases.

A large range of reactors from -196°C to 2400°C and ultra-high vacuum to 300 bar are available. An optional TG-DSC Thermogravimetry – Differential Scanning Calorimetry measuring head allows the simultaneous determination of weight change and caloric reactions in one run.


Linseis offers the broadest range of Sorption Analyzers for numerous applications such as:

  • Chemisorption/Physisorption (UHV to 1000 bar)
  • Adsorption Isotherms (BET Surface Analysis)
  • TPD, TPO, TPR measurements (-196 to 1800°C)
  • Sorption Enthalpies (Simultaneous TG/DSC-sensor)
  • In-situ Gas Analysis (FTIR, Raman, ELIF)
  • Corrosive Atmospheres Magnetic Suspension Balance

Linseis GSA-Series


  • Gravimetric Sorption Analyzer (GSA)
  • Market leading precision, accuracy and repeatability
  • From vacuum up to 10 bar
  • -150 up to 500/700/1000°C and RT up to 1400/1600°C


GSA PT 100

GSA PT 100
  • High temperature and high pressure Gravimetric Sorption Analyzer (GSA)
  • Unique Magnetic Levitation Balance, seperating balance and reactor
  • Selection of different gas and vapor dosing systems
  • Temperature range: -170°C up to 1250/1400/1600/1800°C
  • From vacuum up to 300 bar (on request)


GSA PT 1000

GSA PT 1000
  • Worlds only Gravimetric Sorption Anaylzer (GSA) including a DSC (Differential Scanning Calorimeter)
  • Combined Gravimetric and Calorimetric Signal
  • Selection of Vapor and Gas Dosing Accessories
  • Temperature range: -196 up to 2400°C
  • From Vacuum up to 150 bar


Gravimetric Sorption

The adsorption or desorption of various gases by materials like catalysts or porous structures is one special, but very frequently asked application on thermo-balances. In general, there are two ways of monitoring adsorption and desorption, the volumetric sorption, where a definite amount of gas is brought into a sample chamber and the pressure change provides the information, and the gravimetric sorption, where the mass change of the sample is analyzed.

With our thermo-balance series, we use the gravimetric sorption setup which is possible due to our high resolution balance cells that can monitor very small mass changes over a broad pressure range. This enables the gravimetric analyzer to analyze precisely the adsorption and desorption behavior of various materials in a temperature range from -196°C to 2400°C and a pressure range of 0.01 mbar to 300 bars.

There are a lot of advantages coming up with gravimetric sorption: If a DSC measurement system is used, there is also the possibility to detect the sorption enthalpy during the measurement, what can provide very interesting information about the adsorption process as well.

Another point is the flexibility in measurement systems and sample volumes that can be some milligram or even some gram using different sample holders. The gravimetric vapour sorption is the easier, faster and more flexible method to get information about gas adsorption, even if the accuracy of volumetric sorption can’t be reached so far.

The following devices can be used for gravimetric sorption analysis:

Application areas:

  • Gas Sorption Analysis
  • Sorption Enthalpies (Simultaneous TG/DSC- sensor)
  • Density Determination
  • Gas Storage
  • Zeolites
  • Catalysts
  • In-situ Gas Analysis (FTIR, Raman, ELIF)
  • Kinetic Analysis
  • Corrosive Atmospheres – Magnetic Suspension Balance
  • Adsorption Isotherms (BET Surface Analysis)
  • TPD, TPO, TPR measurements (-196 to 1800°C)

Measuring Ranges:

GSA Messbereich



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FTIR Coupling for GSA

All LINSEIS gravimetric sorption systems can be coupled with additional analyzing tools like FTIR. In the experiment charcoal was gasified in CO2 atmosphere. Therefore the coal sample was placed in the instrument and the temperature at constant pressure of CO2 was increased. During an isothermal segment at 1100°C, a huge mass loss could be observed, which symbolizes the gasification of the bound carbon (following the equation C+CO2 2 CO).

The graphic shows the in-situ FTIR measurement during gasification of coal in a TGA system. (Sample temperature: 1100°C, pure CO2 atmosphere at a gas flow rate of 20 ml/min at 273K, 0.013 bars) The FTIR measurement was taken for 30s during the main mass loss step. The CO and CO2 signals can be clearly seen in the IR spectrum, proving the release of CO gas during the mass loss step.

GSA FTIR Coupling




Linseis Product Overview English

Product Overview


GSA Product brochure

GSA Product Brochure (PDF)