STA 2500 Regulus
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STA 2500 Regulus Simultaneous Thermal Analysis Technique, Instrument, Applications Analyzing & Testing

Technique Simultaneous thermal analysis refers to the simultaneous application of two or more thermoanalytical methods to the same sample in one instrument. This term, however, is in most cases used for simultaneous measurement of the mass changes and caloric effects on a sample under thermal treatment. The benefits of such a system are obvious: Often, the material available for testing is expensive or difficult to produce. The transformation energetics and mass change are obtained on one sample in one run; the time necessary for the tests is cut in half. Influences of the measurement...

Key Features at a Glance Top-Loading and Unique Differential Balance Arrangement The natural gas flow in the top-loading system guarantees automatic protection of the balance against condensation and contamination. The tailormade differential balance system cancels out buoyancy and convection influences over a broad temperature range. This provides easy operation without the need for time-consuming baseline runs. Various Atmospheres Available Measurements can be performed in inert and oxidizing atmospheres but also under vacuum. The atmosphere can be dynamic or static. The built-in mass...

Standard Solution with Trendsetting Technology Advantages of the Unique Top-Loading Differential Balance Arrangement The STA 2500 Regulus is equipped with a tailor-made ultra-micro balance with a resolution of 0.03 μg. The self-compensating differential balance operates with two symmetric balance arms, connected to the reference and sample rod in the furnace. The compensation system (coil magnets) is controlled by a highresolution optical sensor. This avoids rod movements resulting in a stable, high-resolution balance with a weighing range of ± 250 mg. The differential balance set-up...

Top-loading, vertical & differential balance Furnace data Temperature range Heating rate Temperature precision (repeatability) Motorized furnace hoist RT to 1100°C/1600°C (2 easily exchangeable furnaces) 0.001 to 100 K/min (depending on the furnace) 0.3 K Single hoist Balance and Sensor Data Design Weighing range Thermogravimetric resolution Thermocouple Differential balance system ± 250 mg, max. sample load 1 g 0.03 μg Type S Atmosphere Vacuum-tight Gas atmospheres Gas control 10-4 mbar (10-2 Pa), depending on the evacuation system Inert, oxidizing, vacuum Built-in mass flow controllers...

Excellent Reproducibility Initial sample mass: 27.709 mg Three rubber samples from the same batch after changing the atmosphere from nitrogen to air. Heating rate 20 K/min, Pt crucibles The carbon black content of rubber materials is of essential importance and very often underlies a quality control process. In this example, three different rubber mixtures of the same batch were investigated specifically for their carbon black content. After monitoring the decomposition behavior under inert atmosphere, the atmosphere was switched to air and the mass change determined to 0.282 ±0.006% which...

Sublimation of an OEL Layer Multilayered organic structures can have unusual optical and physical properties which offer new possibilities for optoelectronic devices, including e.g., organic light emitting diodes (OLEDs). In organic multilayers, α-NPD is a hole transporting material. The vacuum-tight STA 2500 Regulus allows for measurements under reduced pressure. Here α-NPD was measured under reduced pressure which resulted in a decrease of the sublimation temperature from 380°C at atmospheric pressure (blue curve) to 240°C at reduced pressure (red curve). α-NPD under atmospheric and...

Proteus® Software Highly Efficient and User-Friendly The STA 2500 Regulus runs on a Windows® operating system and includes everything you need to carry out a measurement and evaluate the resulting data. User-friendly menus combined with automated routines make Proteus® very easy to use while providing sophisticated analyses. Key Features of the General Software Software produced by iso-certified company NETZSCH for Windows® 7/8.1 operating systems Simultaneous measurement and evaluation Operation of different instruments with one computer Combined analysis: Comparison and/or evaluation of...

User interface of the Proteus® software during evaluation STA-Specific Features TGA curves in absolute mass change (mg) or relative mass (%) Automatic evaluation of mass change steps and characteristic temperatures Extrapolated onset and endset Peak temperatures and values of the 1st and 2nd derivatives TGA stability check for early termination of the measurement Rate-controlled mass loss DTA curves in absolute (µV) or relative (µV/mg) units Determination of onset, peak, inflection and end temperatures Automatic peak search Exothermal presentation in accordance with DIN or ASTM (selectable)...

ACCESSORIES Sample Pans, Crucibles and Plates A variety of crucibles made of alumina, platinum, aluminum and quartz are available in different shapes and sizes. The STA 2500 Regulus is delivered with slip-on plates which allow for nearly all kinds of sample pans (see table below). The large-volume crucible requires the large slip-on plate. Slip-on plate Large volume Slip-on plate types Crucible Types for Various Applications Material (Purity) Maximum Temperature Fused silica Fused silica * Available only with

Coupling to Evolved Gas Analysis (EGA) By coupling the STA 2500 Regulus to a gas analysis system such as FT-IR (Fourier Transform Infrared) spectrometer, QMS (quadrupole mass spectrometer), or GC-MS (gas chromatograph – mass spectrometer), information on the type of gases evolved as a function of time or temperature can be obtained. This yields detailed information on the material to be tested and may provide fingerprint of the analyzed material. Connection to an FT-IR via transfer line Connection to a QMS via capillary Coupling to a GC-MS via transfer line