Magnetic suspension balances allow the changes in force and mass which act on samples under controlled environments (pressure, temperature, corrosive gases or fluids), to be measured with high accuracy. By means of these measurements it is possible to determine transport quantities and state quantities very easily and accurately (sorption, diffusion, surface tension, density), chemical reactions can be investigated (corrosion, decomposition, combustion etc.)
These reliable suspension balances make it possible to weigh samples contactlessly under nearly all environments. Instead of hanging directly at the balance the sample to be investigated is linked to a so-called suspension magnet which consists of a permanent magnet, a sensor core and a device for decoupling the measuring load (sample). An electromagnet, which is attached to the underfloor weighing hook of a balance, maintains a freely suspended state of the suspension magnet via an electronic control unit. Using this magnetic suspension coupling the measuring force is transmitted contactlessly from the measuring chamber to the microbalance, which is located outside the chamber under ambient atmospheric conditions. Consequently, this arrangement eliminates almost all restrictions which are inherent to conventional gravimetric measuring instruments.
Thermogravimetric analysis (TGA) is a well established method in materials science, physics and chemistry. The continuous weight measurement of a sample while exposing it to a temperature program under controlled atmospheric conditions provides important information about chemical reactions and structural changes of the sample material. Such processes are possible with our thermogravimetric analyzers – including the unique technology of Rubotherm´s Magnetic Suspension Balance.
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.
The ISOSORP-Hygra is an economic measuring instrument to study gas storage properties (equilibrium uptake & kinetics). The high resolution gravimetric measurement has an excellent accuracy and stability and is based on the patented magnetic suspension balance of Rubotherm. Measurements in a pressure range between vacuum and 200 bars at sample temperatures between 77 K…770 K can be performed.
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