Simultaneous Thermal Analyzer – (TGA-DSC)
Thermogravimetric Analyzer TGA + Differential Scanning Calorimeter DSC
The synchronous measurement of mass change (thermogravimetry) and energy conversion (dynamic differential calorimetry) on a single sample (Simultaneous Thermal Analysis – STA) provides significant information compared to using two separate devices.
This ensures consistent experimental conditions for both TGA and DTA/DSC signals (atmosphere, heating rate, thermal contact, radiation, etc.) at all times. Typical applications include differentiation between phase transitions and decomposition, pyrolysis, oxidation, combustion, etc.
The models of the LINSEIS STA series (Simultaneous Thermal Analysis) are used to simultaneously measure the changes in mass (TG) and the calorimetric reactions (DSC / DDK) of a sample in a temperature range from -150°C to 2400°C.
We place particular emphasis on highest precision, highest resolution, and long-term drift stability. The STA Platinum series has been developed to meet these requirements at both high and low temperatures. To achieve this, a range of advanced oven types as well as a wide selection of sample holders and crucibles are available.
Additionally, you can utilize various accessories such as gas mixing systems, gas analysis, and gas safety systems, along with our extensive software offerings.
Simultaneous TGA-DTA/DSC measures both, heat flow (DSC) and weight change (TGA) of a sample as a function of temperature or time under controlled atmosphere. Simultaneous measurement of these two material properties not only improves productivity but also simplifies interpretation of the results. The complimentary information obtained allows differentiation between endothermic and exothermic events which have no associated weight change (e.g., melting and crystallization) and those which involve a weight change (e.g., degradation).
Linseis STA series
Extensions
By combining TG and DTA/DSC/HDSC, a wealth of information is obtained:
More comprehensive information: STA (Simultaneous Thermal Analysis) provides more useful information than the sole application of DSC or TGA techniques. It combines thermogravimetry (TGA) with either dynamic differential calorimetry (DSC) or differential thermal analysis (DTA), allowing for a more comprehensive insight into the thermal stability, reactivity, and composition of materials.
Time efficiency: Simultaneous TGA and DSC execution saves time compared to parallel or sequential execution of the techniques. This is particularly advantageous when analyzing a wide range of materials and reactions.
Differentiation of reactions: STA enables the differentiation between endothermic and exothermic reactions, which may not be distinguished when using individual techniques. For example, DSC easily distinguishes between endothermic and exothermic processes, while TGA can produce similar signals for different reactions.
Improved accuracy: STA compensates for uncertainties in separate TGA and DTA/DSC measurements caused by sample inhomogeneities, sample geometry, and temperature inaccuracies. This leads to more accurate and reliable results.
Identical test conditions: With STA, the test conditions for TGA and DSC signals are completely identical, including atmosphere, gas flow rate, heating rate, and thermal contact with the crucible and sensor. This ensures consistency and reliability in the measurements.
Measurement parameters and effects overview:
- Enthalpy, fusion energy
- Specific heat capacity
- Glass transition point
- Crystallinity
- Reaction enthalpy
- Thermal stability
- Oxidation stability
- Aging processes
- Purity analysis
- Phase transitions
- Solid/liquid interfaces
- Eutectic points
- Polymorphism
- Sample identification
- Mass changes
High-precision beam balance
Our different microbalances are specifically designed to accomplish thermal analysis tasks in the best possible way. Providing ultra light weight design to follow fast weight changes and symmetric construction for ultra low drift long term measurements.
Advantages of the LINSEIS balance design
Advantages of the combination of TG + DSC
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- Compensation of sample mass by a counterweight enables improved sensitivity
- Enhanced symmetric design for high interference levels
- No influence from local gravity
- No influence from thermal fluctuations
- Highest precision possible
- The concept allows for easy maintenance
- Depending on the model, the balance can handle sample masses from mg up to 50g
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- Same geometry
- Stoichiometry
- Same temperature profile
- Same atmosphere
- Same humidity
DSC heat flux measurement
Differential scanning calorimetry (DSC)
A method in which the difference between the energy input to a substance and a reference material is measured as a function of temperature while the substance and reference material are subjected to a controlled temperature programme.
Differential signal
The difference signal is displayed as a baseline. The baseline is displayed as a baseline. Effects, for example the melting of a metal, can be observed as a peak. The area of the peak indicates the amount of enthalpy and the direction of the peak indicates the type of heat flow – endothermic (downward) or exothermic (upward).
Temperature vs. time
In the case of an effect such as a reaction, decomposition or phase transition, a temperature difference (heat flow difference) between the sample and the reference crucible can be measured using a thermocouple.
Are you interested in an STA measuring device?
Would you like to carry out a sample measurement?
Get in touch with us today!
