TG-DTA

Simultaneous Thermal Analysis (STA) generally refers to the simultaneous application of thermogravimetry (TG) and differential thermal analysis (DTA) to one and the same sample in a single instrument. The measurement conditions are perfectly identical for the TG and DTA signals (same atmosphere, gas flow rate, vapor pressure of the sample, heating rate, thermal contact to the sample crucible and sensor, radiation effect, etc.). Rigaku adopts the horizontal differential triple-coil balance system which is the mainstream mechanism because the thermal drift which apparent mass change with increasing temperature becomes negligibly small.

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Description

TG can provide information about physical phenomena, such as second-order phase transitions, including vaporization, sublimation, absorption, adsorption, and desorption, while DTA can provide information on the transformations that have occurred, such as glass transitions, crystallization, melting and sublimation.

The Infrared heating furnace can be selected for quick heating and cooling. The sample is heated by infrared radiation emitted from infrared lamp.

The sample holders are easily replaced adopting the plug-in type holder. When replacing sample holders due to spillage, maintenance is quite simple. The auto sample changer can be attached to the standard TG-DTA. We can set maximum 24 samples and aside from continuous measurements, it can also perform single measurement as well as interrupt-a-sequence measurement.

Dynamic TG mode that is a sample controlled thermogravimetry (SCTG) where the heating rate is controlled in response to mass changes in the system’s properties is equipped as the standard function.

The information gathered can even be enhanced by coupling the TG-DTA instrument to an Evolved Gas Analyzer (EGA) such as mass spectrometry (MS).

<5>Features

  • Accurate compensation on horizontal differential triple-coil balance
  • Compact furnace greatly speeds up heating and cooling
  • Dynamic TG measurement modes
    • Stepwise isothermal analysis (SIA) method
    • Constant rate control (CRC) method
  • Measuring temperature range
    • Ambient to 1100° : 8122 standard model
    • Ambient to 1500° : 8122 high-temperature model
  • Operating temperature range (maximum)
    • 950° : Infrared heating furnace model

Specifications

Model TG-DTA Standard model High Temperature model TG-DTA Standard model TG-DTA with infrared heating*1 High Temperature model TG-DTA with infrared heating*1*2
Measurement temperature range Ambient to 1000°C Ambient to 1500°C Ambient to 950°C Ambient to 1500°C
Heating rate 100°C/min Ambient to 700°C (120 sec)*3 Ambient to 1000°C (60 sec)*3
Measurement method Horizontal differential triple coil balance system
Sample mass Up to 1 g
TG range (FS) 500 mg
TG resolution 0.1 µg
DTA range (FS) 2000 µV
Measurement atmosphere Air, inert gas flow, gas flow, vacuum, water vapor
Automatic sample loader*4 Samples: 24; Reference samples: 3; Calibration samples: 5

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