EGA Evolved Gas Analysis QMS


On point

Mass spectrometry (MS) is a powerful analytical technique employed to measure the mass of atoms or molecules that are vaporized from a sample material, often achieved by heating. The resulting spectra provide essential information for determining the elemental or isotopic composition of a sample, as well as the masses of individual particles and molecules. Additionally, MS aids in elucidating the chemical structures of compounds, including peptides and other complex molecules. This is accomplished by ionizing the chemical compounds to generate charged molecules or molecule fragments, and subsequently measuring their mass-to-charge ratios.

Our state-of-the-art QMS (Quadrupole Mass Spectrometer) coupling device features a heated inlet system, making it a valuable tool for the analysis of volatile decompositions. At Linseis, we prioritize user-friendly operation for both the Thermal Analyzer and the Mass Spectrometer. We provide an integrated software solution to streamline the process and ensure a seamless user experience.

Example System: Coupling Thermo Balance TG/STA + Quadrupol Mass-spec(QMS):

Example System: Coupling Thermo Balance TG/STA + Quadrupol Mass-spec(QMS):

Both Linseis and Pfeiffer are renowned leaders in their respective specialized fields, and their collaboration ensures exceptional performance for the combined system.

Key Features:

  1. Temperature-controlled transfer line, reaching up to a maximum of 250°C.
  2. Swift response times due to a short transfer line.
  3. Highly sensitive MS detector, offering a range of mass numbers for versatility.
  4. Versatile applications that can be measured, including:
  • Analysis of outgassing components from burned materials (e.g., paints).
  • Determination of binders and additives.
  • Examination of absorption and desorption processes.
  • Analysis of rubbers and plastics.

Instrument Features:

  1. Linseis Research balance, available in various models, with options for TG, simultaneous TG/DSC, or TG/DTA measurements.
  2. Simultaneous balance with resolutions of 0.1/0.5/1µg and a maximum sample weight of 25 grams.
  3. Capability for specific heat measurements (Cp).
  4. Pfeiffer/Balzers mass spectrometer model Thermostar, offering multiple ranges of mass-to-charge ratios (0 – 100 amu, 0 – 200 amu, 0 – 300 amu).
  5. Utilization of the high-precision Quattropol-MS from a world leader in mass spectrometry technology.
  6. Compact MS dimensions, facilitating easy quartz capillary replacement.
  7. Three separate heating zones, including the capillary, TG protection tube, and MS vacuum inlet.
  8. Flexibility in carrier gas flow rates.
  9. Specially developed Al2O3 “sniffer-nose” for efficient extraction of outgases.
  10. Integration of combined results from TG and MS into a single evaluation sheet.
  11. A complete vacuum-tight system to ensure precise and reliable measurements.


Modell EGA – QMS (EGA Coupling/ Gas Analysis)
Massnumbers: 100/200/300 amu
Detector: Faraday and SEV (Channeltron)
Ion source: Electron impact, Energy: 100 eV
Vacuum system: Turbomolecular and Diaphragm pump (oil free)
Heating: Adapter, heated capillary and QMS
Couplings: DSC, TGA, STA, DIL by heated capillary

You are interested in a coupling?

You need more information?

Contact our application experts!



Pulse-Analysis introduces an accurately predetermined volume of liquid or gas into the Thermobalance (TGA) or Simultaneous Thermal Analyzer (STA), significantly expanding measurement capabilities. This method enables precise calibration of the Mass Spectrometer (MS) or Fourier Transform Infrared Spectroscopy (FTIR) and allows for precise quantification of outgassing events.


Given the restrictions on the input pressure of the Mass Spectrometer (MS), it’s necessary to sample gases after the pressure controller at ambient pressure. Therefore, only substances capable of passing through the cold trap can be analyzed.

Outgases from the sample are directed directly to the QMS analyzer using a very small aperture, which lowers the pressure within the pressure vessel to match the input pressure accepted by the QMS. Because this aperture is situated within the hot zone of the furnace, condensation of outgases does not occur. Additionally, the vacuum of approximately 1e-5mbar existing between the aperture and the ion source of the QMS prevents condensation.

The sniffer device is positioned directly above the sample, made possible by the sniffer material’s ability to withstand the high temperatures within the hot furnace area.


Application Example: Cement Analysis

The combination of thermal analysis with mass spectroscopy is a potent method for identifying and quantifying the components within raw materials, offering insights into the manufacturing processes of building materials. Cement raw materials typically consist of a mix of ceramic components (e.g., gypsum, calcium carbonate) and organic components.

STA and QMS Analysis:

In the provided image, simultaneous thermogravimetry (TG) is combined with differential scanning calorimetry (DSC) and mass spectroscopy (MS) to gain a comprehensive understanding of the material. Mass spectrometry plays a crucial role in identifying the gases released during the analysis. The MS reveals peaks corresponding to H2O at lower temperatures, likely originating from gypsum. Between temperatures of approximately 300°C to 400°C, DSC peaks and signals from the mass spectrometer indicate the decomposition of organic components. A distinct peak of CO2 around 800°C signifies the breakdown of CaCO3, while at approximately 1300°C, CaSO4 decomposes, producing an SO2 peak.

Decomposition of CaC2O4:

The gases released during the decomposition of calcium oxalate have been directed into the mass spectrometer through a heated capillary. The ion currents for mass numbers 18 (water), 28 (carbon monoxide), and 44 (carbon dioxide) have been plotted in the graph for analysis. This process offers valuable insights into the various components and reactions occurring within the cement material.

Mass spectromy of roof tile clay


Product brochure (65Kb)

Product brochure (113Kb)

Couplings / Gas Analysis (PDF)

Scroll to Top