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Dumatherm Principle
- PRINCIPAL OF ANALYSIS
Solid or liquid samples are combusted at high temperatures in the presence of catalysts into oxides. With the help of copper, the resulting nitrogen oxides (NOx) are reduced to elemental nitrogen while the by-products, water and carbon dioxide are separated completely. The remaining nitrogen is analyzed using a single filament detector.
- ANALYSIS PROCEDURE
The samples drop from the auto sampler (AS) into a purge chamber, which is constantly purged with helium. The combustion is initiated by switching the gas flow to oxygen and the transport into the 1000 degree C, upright combustion chamber (LF). The ashes are collected in a quartz tube insert, which can be easily taken out and exchanged. Among all resulting combustion products (CO2, H2O, and N-oxides), the nitrogen oxides react in the reduction furnace (RF) to elemental nitrogen (N2). The majority of the water is separated using an intelligent tube membrane system (F1), which works using a semi permeable wall in the counter flow. Any remaining amounts are caught in an absorption trap (F2), where the separation of CO2 is done in self re-generating absorption traps (F3). Elemental nitrogen remains, and is measured in a thermal conductivity detector (TCD) without any reference gas flow.
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