TE Instruments has developed the XPLORER-NS, a Total Nitrogen and Total Sulfur combustion analyzer, offering fast, accurate and precise analysis of solids, liquids, gases and LPG’s. This brand new model is designed to offer standardized and customized solutions to match both current and future analytical needs, ranging from low ppb’s to high ppm’s.
Samples are introduced, using the appropriate introduction module, into a furnace, where the oxidation takes place. After a complete combustion, nitric oxide (NO) and Sulfur dioxide (SO2) are formed and led into the serial connected reaction chambers, in the meantime water and particles have been removed.
COMBUSTION: R-SN + O2 → NO + SO2 + H2O + CO2
Sulfur detection: Sulfur is measured by pulsed UV-fluorescence. Sulfur dioxide (SO2) is formed during the oxidation and is transferred to the reaction chamber. Here it is excited by a pulsed UV source and as the excited state is unstable, the excited SO2 instantly decays to its ground state energy level. During this process, UV light is emitted. As this light has a different wavelength than the original UV source, the photomultiplier tube is able to detect this emission. The amount of light emitted reflects the total amount of SO2 present in the gas, which in turn corresponds to the total amount of sulfur in the sample.
DETECTION: SO2 + hv1 → SO2* SO2* → SO2 + hv2
Nitrogen detection: Electronically generated ozone is added which reacts with the nitric oxide to nitrogen dioxide (NO2*) in an excited state (formed in the reaction chamber). The excited NO2 emits light as it reverts to a lower energy state. The emitted light is detected by a Photomultiplier Tube (PMT). The amount of detected emitted light, corresponds with the amount of NO. This in turn represents the amount of Total Nitrogen present in the sample.
DETECTION: NO + O3 → NO2* NO2* → NO2 + hv1
S：ASTM D5453、ASTM D6667、ASTM D7183、ISO 20846、GB/T 11141、SH/T 0689、GB/T 11060.8
N：ASTM D4629、ASTM D5762、ASTM D6069、ASTM D7184、SH/T 0657、EN 12260
Chemicals: Acetic Acid, Polypropylene & -ethylene, Polycarbonate, Aromatics, Resins, Olefins and parafines； Refinery products: Crude oil, Kerosene, Fuel oil, Gasoline, Diesel fuel, Catalyst, Naphta, Lubricants； LPG and gases