Thermogravimetric Analysis Accessories
Discovery Mass Spec
Discovery Mass Spec
The Discovery MS is a benchtop quadrupole mass spectrometer, designed and optimized for evolved gas analysis. It features industry-standard technology configured for the efficient transfer, and rapid detection of offgas from the TGA furnace. Parts per billion (ppb) sensitivity is ensured with our state-of-the-art quadrupole detection system, including a closed ion source, a triple mass filter and a dual (Faraday and Secondary Electron Multiplier) detector system. This analyzer configuration is selected to optimize sensitivity and long-term stability performance.
Control of the experimental parameters and analysis of the mass spectral data is achieved through a user-friendly, recipe-driven software interface. Data collection can be triggered directly from the TGA software, and the resulting MS data can be combined with the corresponding TGA results for direct overlaying and comparison.
|Mass range (amu)||1-300|
|Mass Resolution||>0.5 amu|
|Sensitivity||< 100 ppb (gas-dependent)|
|Ionization Source||Electron Ionization|
|Detector System||Dual (Faraday and Second Electron Multiplier)|
|Sample Pressure||1 atm (nominal)|
|Data Collection Modes||Bargraph and Peak Jump|
|Bargraph Mode||>50 amu/s|
|Peak Jump Mode||>64 channels/s|
|Transfer line Temperature||300 °C (fixed)|
|Transfer line||1.8 meters, flexible|
|Filaments||Dual, customer changeable|
|Capillary||Stainless Steel, changeable|
|Capillary size||I.D. = 0.22 mm|
|Inputs||Data collection controlled by TGA Trigger|
In Hi-Res TGA, the heating rate is controlled by the decomposition rate of the sample. The Discovery TGA 5500 and 550 designs are ideal for these measurements with rapid response furnaces for precise temperature control, and sensitive thermobalances designed to quickly detect small weight changes.
Benefits of Hi-Res TGA include:
- Separation of broad and overlapping weight losses
- Increased productivity with better resolution
- Rapid survey over wide temperature range with excellent resolution
- Simple method set up
The figure above shows the Hi-Res TGA results for a polyurethane material by standard and Hi-Res TGA. The superior resolution provided by the Hi-Res technique is clearly evident in both the TGA weight loss and the first derivative (DTG) signals. The latter signal is especially useful in defining the onset and the end-set of the individual weight loss segments, as well as indicating subtle events that provide a “fingerprint” of the sample.
TA’s patented MTGA* is another TA Instruments innovation that offers advantages for material decomposition studies. Developed from the proprietary heater control technology utilized by Hi-Res TGA and MDSC, MTGA produces model-free kinetic data. Activation energy can be calculated real-time and studied as a function of time, temperature, and conversion.
Benefits of MTGA include:
- Increased productivity for studying kinetics
- Model-free kinetic data
- Can be combined with Hi-Res for better separation of overlapping weight losses
- Direct measurement of activation energy
Optional Evolved Gas Analysis (EGA) furnace for the TGA 55 and TGA 550.
Features & Benefits
- Ambient to 1000 °C
- Heating rates of 0.1 to 50 °C/min linear controlled
- Low volume, vacuum tight, and quartz lined for good evolved gas results
- Quartz liner makes furnace easy to clean
|Platinum||50µL100µL||Ambient to 1000°C||Robust, high performance, reusable pans|
|Ceramic||100µL 250µL||Ambient to 1200°C||Reusable pans for higher temperatures|
|Aluminum||80µL||Ambient to 600°C||One time use, can be sealed to prevent volatilization before experiment|
The DTA signal is a qualitative measurement of endothermic and exothermic reactions occurring in the TGA. This signal can also be used for temperature calibration by using melting point standards.