Analyzer Stability
Our elemental combustion analyzers precisely measure Total Nitrogen and Total Sulfur using high-temperature combustion (around 1000°C) in an oxygen-rich environment. During combustion, sample materials (solid, liquid, or gas) produce NO and SO₂, which are detected by a Pulsed UV-Fluorescence followed by a Chemiluminescence detector.
Our unique quartz combustion tube allows direct injection of the sample into the heated oxidation zone or introduction using a quartz sample boat. This design ensures a large oxidation surface area to achieve complete combustion without the need for an oxidation catalyst. Unlike other analyzers that rely on catalyst-packed tubes, the XPLORER Series is engineered to maintain high oxidation efficiency even for challenging samples, delivering consistent, reliable results.
Detection of Total Sulfur – UV-Fluorescence
When organic Sulfur components are combusted in the high-temperature furnace, the following reaction takes place:
R-S+ O₂→ SO₂ + H₂O + CO₂
After complete sample oxidation, the combustion gas is conditioned by removing water vapor and particles.
The conditioned gas stream containing the Sulfur Dioxide (SO₂) molecules is transferred to the reaction chamber.
The Xenon flashed UV lamp will excite the Sulfur Dioxide molecules to SO₂(*) at specific wavelengths and due to the unstable character of the SO₂(*) it will relax back to SO₂ instantly. The released energy will be emitted in the form of light and will be detected by the Photomultiplier Tube (PMT). The amount of light emitted equals the total amount of SO₂ (Total Sulfur) present in the sample.
Detection:
SO₂ + [g]1 à SO₂( *)
SO₂( *) à SO₂ + [g]1
Detection of Total Nitrogen – Chemiluminescence
When Nitrogen components are combusted in the high-temperature furnace, the following reaction takes place:
R-N+ O₂→ NO + H₂O + CO₂
After complete sample oxidation, the combustion gas is conditioned by removing water vapor and particles.
Ozone is added to the conditioned gas stream in the Chemiluminescence reaction chamber. Ozone reacts with Nitric Oxide (NO) to form Nitrogen Dioxide in an excited state (NO₂*). The emitted light is detected by a Photomultiplier Tube (PMT). The amount of detected emitted light corresponds with the amount of NO (Total Nitrogen) present in the sample.
Detection:
NO+ O3 à NO₂( *) + O₂
NO₂(*) à NO₂ + [g]1