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| | | Advanced Coupling Techniques for Evolved Gas Analysis | | |
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| | | SKIMMER | | |
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| | | | | | | | | | | TG f\ ■ A V | PCO A | | | | | | —31.30 | | | | | m/TTi^O)- ' m/z = 28 (CO, CO2) | I -17.3%~"\|/\l "24.95 1 .-18.90 | p à H2 — 14.97 -2.29 | | | | " m/z = 44 (CO2) J | 21.76- | | | | | 3.651 | | | | | m/z = 2 (H2) | | | | | | -55.3% | | | | | | | | | | | |
| | | 0 -10. % -20. e-30> -40' -50. -60' | |
| | | Quantification of the signals from industrial gas analyzers requires a calibration of the whole coupled system with a known type and amount of gas or liquid in order to account for the temperature dependent gas flow properties. The PulseTA® is the perfect tool for achieving quantitative gas detection in separate calibration runs or even online during a sample measurement. A known amount of gas or liquid is simply injected into the sample gas stream. The resulting pulse signal is registered and evaluated. The application of PulseTA® also increases the sensitivity of thermoanalytical measurements, allows the studying of gas-solid reactions with step-wise control of the process by the pulsed supply of the reactive gas, and simplifies adsorption /desorption experiments. | | |
| | | TA-MS The SKIMMER coupling is the shortest possible solution for the gas transfer from the sample to the QMS. An intense, highly parallel oriented molecular beam is collimated by the aerodynamic beam SKIMMER from the barrel-shaped jet expansion behind the divergent nozzle. The pressure reduction of the purge gas flow at atmospheric pressure down to the high vacuum behind the SKIMMER orifice is achieved in two steps along a distance of less than 20 mm. All components are heated to at least the sample temperature and therefore no chance for any condensation exists. Even metal vapors are detected by this unrivalled coupling system. | | |
| | | Temperature range: RT ... 2000°C Mass range: 1 ... 512/1024 amu Resolution: 0,5 amu Electron impact ionization 25 ... 100 eV adjustable 2 tungsten cathodes Operation modes: scan, scan-bargraph, MID Detection limit: > 100 ppb | | |
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| | | 0 | | 100 | | 200 | | 300 400 500 temperature / ¡C | | 600 | | 700 | | |
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| | | Thermal decomposition of ZnC2O4*2H2O measured in a industrial helium gas flow (50 ml/min). With corresponding pulses of CO and CO2, marked by P, a quantification of the evolved gases is possible, even with the overlapping contributions to m/z 28 by CO and the fragmentation of CO2. The reaction between CO2 and traces of water is shown by the H2 signal and quantified by the H2 pulse P. | | |
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| | | Pitch carbon powder (55.2 mg) decomposes in nitrogen flow (50 ml/min) into high molecular weight aromatic compounds (mainly below 600°C). Only a selection is shown by MID curves for pyrenes (m/z 202), triphenyl-enes (m/z 228), benzo(a)pyrenes (m/z 258), benzo(ghi)perylenes (m/z 276) and dibenzopyrenes (m/z 302). | | Determination of carbon and sulfur content in a petrol rock. During calcination in air, the CO2 and SO2 signals can be exactly quantified through corresponding pulses. | | |
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| | | pulse device TG-DSC gas composition | | |
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| | | STA 409 CD - QMS 403/5 SKIMMER Coupling | | |
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