תיאור
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 are 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 simultaneous TGA-DSC or simultaneous TGA-DTA measurements. The TGA sample carriers can be exchanged with TGA-DSC or TGA-DTA sample carriers in a matter of seconds so that a very powerful and versatile STA is always ready.
QMS 403/5 SKIMMER® – Technical Specifications
STA and QMS features:
Temperature range:
SiC furnace: RT to 1450°C with SKIMMER® orifice from alumina
Graphite furnace: RT to 2000°C with SKIMMER® orifice from glassy carbon
Heating rate: Standard furnaces: 0.001 to approx. 100 K/min
Weighing range of balance system: 15000 mg
TG resolution: 2 µg
Sensor types: DSC, DTA, TG, DSC-cp, quickly exchangeable
Extension with unique OTS® system (option)
Extension with glove box available (option)
Corrosion resistant version available (option)
Crucibles of various types and in in different dimensions
Different mass ranges Selectable with QMS:
1 u to 512 u
1 u to 1024 u
Resolution:
0.5 u
Ion source
– Electron impact, energy 0
125 eV, in steps of 1 eV adjustable,
for soft and hard ionization
Note: limits below 40 eV require a reduction of emission and adaption of further ion source voltages in order to avoid superheating of the cathode – Low mass construction, special Cross Beam
Cathodes/filments: Tungsten
Measuring modes / scan rates:
Analog scan
Scan Bargraph
Multi Ion Detection (MID)
90° SEV
Detection limit > 10-14 mbar, or > 100 ppb
SKIMMER® temperature:
sample temperature
SKIMMER® material:
Alumina (1450°C)
Glassy carbon (2000°C)