Description
To the point
Mass spectrometry (MS) is an analytical technique to measure the mass of atoms or molecules of a gas e.g. evaporated from a sample material which has been heated up. The spectra are used to determine the elemental or isotopic signature of a sample, the masses of particles and of molecules, and to elucidate the chemical structures of molecules, such as peptides and other chemical compounds. Mass spectrometry works by ionizing chemical compounds to generate charged molecules or molecule fragments and measuring their mass-to-charge ratios.
The QMS – quadrupole mass spectrometer coupling device is a state of the art mass spectrometer with a heated inlet system. The QMS is used for the analysis of volatile decompositions. All Linseis instruments are especially designed to guarantee a user friendly operation of both the Thermal Analyzer and the Mass Spectrometer. A integrated Software solution is certainly available.
The coupling of the Linseis thermobalance together with the Pfeiffer mass spectrometer provides a very reliable EGA (emission gas analysis).
This can provide very interesting information for material characterization in the development of new ceramics, pharmaceuticals or polymers and metals. Also very interesting are investigations into the environmental compatibility of the outgassing products, e.g. in waste disposal/incineration or in car paint shops.
Characteristics
- Top-shell research balance (various models); TG or STA (TG+DTA/DSC)
- high-resolution (0.1/0.5/1µg) simultaneous TG/DSC or TG/DTA
- high sample weights max. 25g
- Quantitative specific heat measurement Cp
- Pfeiffer/Balzers mass spectrometer model “Thermostar” (0 – 100 amu, 0 – 200 amu, 0 – 300 amu)
- Very easily replaceable quartz capillaries
- Three separate heating zones; on the capillary, on the TG protection tube and on the adapter head of the mass spectrometer
- Low purge gas flow rates
- Specially developed Al2O3 “sniffer nose” for extracting the outgassing
- Joint display of TG and MS signals
- Vacuum-tight system
- Specially developed sample chamber geometry
Unique Features
High detection sensitivity:
Heated spectrometer for analyzing
released decomposition gases.
Compatibility:
Easy coupling with thermobalances (TG),
simultaneous thermal analysis (STA)
and other thermoanalytical devices.
Three separate heating zones:
Ensuring minimal dilution effects
and precise results.
Versatile applications:
Useful for material characterization in
ceramics, pharmaceuticals, polymers
and metals.
Robust design:
Vacuum-tight system for
reliable and repeatable
measurements.
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Specifications
Black on white
MODEL | EGA - QMS (EGA COUPLING / GAS ANALYSIS) |
|---|---|
| Mass range: | 100/200/300 amu |
| Detector: | Faraday and SEV (Channeltron) |
| Ion source: | Electron impact, energy 100 eV |
| Vacuum system: | Turbomolecular pump and diaphragm pump (oil-free vacuum) |
| Heating: | Adapter head, capillary and QMS |
| Coupling with: | DSC, TGA, STA, DIL via heatable adapter accessories |
Available accessories
Pulse-Analysis
The Pulse-Analysis injects a exactly predetermined amount of liquid or gas into the Thermobalance (TGA) or Simultaneous Thermal Analyzer (STA). This enhances the measurement possibilities significantly: the MS or FTIR can now be calibrated. Out gassings can be quantified precisely with this method.
MS-Sniffer
Due to the limitation of the input pressure of the MS, the sample gas must be taken after the pressure controller (at ambient pressure). So, only substances which can pass through the cold trap can be analyzed.
The outgassings of the sample are passed to the QMS-analyzer directly, using a very small aperture. This small aperture (or orifice) reduces the pressure inside the pressure vessel to the input pressure allowed for the QMS. Since this aperture is inside the hot zone of the furnace, condensation of the out gassings can’t take place. Since between the aperture and the ion-source of the QMS a vacuum of app. 1e-5mbar exists, condensation there is impossible also.
The sniffer is placed directly above the sample. This is possible because of the the sniffer material, which can resist the temperatures in the hot furnace area.
Applications
Application example: Cement
The combination of thermal analysis with mass spectroscopy is a very powerful method to identify and quantify the components of the raw material and it is also a tool for the simulation of the manufacturing process of building materials. The components of cement raw material are: mixture of ceramic components (gypsum, calcium carbonate, etc.) and also organic components.
Analysis using STA and QMS
The picture shows the simultaneous thermogravimetry (TG) combined with differential scanning calorimetry (DSC) and mass spectroscopy (MS). The mass spectrometry allows the identification of the evolved gases from the material. Mass spectrometry shows peaks from H2O at low temperatures most probably from gypsum. The DSC peaks and the signal from mass spectrometer between ~300°C – 400°C indicates the decomposition of organic components. The peak of CO2 at ~800°C indicates the decomposition of CaCO3. At ~1300°C CaSO4 decompose (SO2 – Peak).
Decomposition of CaC2O4
The evolved gases from the decomposition of calcium oxalate have been fed into the mass spectrometer with a heated capillary. The ion currents for mass numbers 18 (water), 28 (carbon monoxide) and 44 (carbon dioxide) have been imported into the graph.
Well informed
