תיאור
Unique, integrated coupling system for unlimited gas analysis
The SKIMMER coupling system with a quadrupole mass spectrometer (QMS) is worldwide the most sensitive system for thermoanalytical gas analysis. The coupling takes place directly in the furnace of the STA 409 CD, which is especially developed for the usage with the SKIMMER coupling. The first pressure reduction stage is arranged directly above the sample container. The orifice is so designed that it works as divergent nozzle. The SKIMMER is the second pressure reduction stage and arranged in the range of the forming compression area behind the nozzle. The distance between sample and high-vacuum component is only ca. 12 mm. As the entire system has sample temperature, condensation during gas transfer is excluded. Due to the vertical gas flow in the sample area and the short distances a complete transfer of the evolving gases is ensured. This again results in short retention times and an extremely high sensitivity.
The STA 409 CD is designed for TGA, simultaneous TGA-DSC or simultaneous TGA-DTA measurements. The TGA sample carriers can be exchanged, in a matter of seconds so that a very powerful and versatile STA is always ready.
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Temperature range:
- SiC furnace: RT to 1450°C with SKIMMERorifice from alumina
- Graphite furnace: RT to 2000°C with SKIMMER orifice from glassy carbon
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Heating rate:
Standard furnaces: 0.001 to approx. 100 K/min
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Weighing range of balance system:
15000 mg
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Sensor types:
DSC, DTA, TG, DSC-cp, quickly exchangeable
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Extension with glove box
available (option)
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Corrosion resistant version
available (option)
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Crucibles of various types
and in in different dimensions
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Mass range available with QMS:
- 1 to 512 u (*)
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Resolution:
0.5 u (*)
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Measuring modes / scan rates:
- Analog scan
- Scan Bargraph
- Multi Ion Detection (MID)
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Detector:
90° SEV, Detection limit > 10-14 mbar, or > 100 ppb
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SKIMMER temperature:
sample temperature
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SKIMMER material:
Alumina (1450°C)
Glassy carbon (2000°C)
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Ionisation:
electron impact
u* = unified mass unit
QMS features:
- Analog scan, scan rates > 0.2 s/u (*)
- Scan Bargraph, scan Rates > 20 ms/u (*)
- Multi Ion Detection (MID) up to 64 selectable mass numbers, scan rates > 10 ms/u (*)
- Characteristic temperatures (Onset, Peak and End)
- Peak areas for quantitative evaluation and calibration
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Spectra subtraction
u* = unified mass unit
