Table of Contents
- How the sulfur analyzer works
- The principle of work
- PUVF Detector
- Mix chamber
- Injection milk
How the sulfur analyzer works
Sulfur analyzers are based on the principle that SO2 molecules absorb ultraviolet light and are excited at one wavelength, then decompose to a lower energy state and emit UV light at different wavelengths. specifically:
What is an analyzer?
The sample input wall pulls the sample into the analyzer. The sample is mixed with air and passed through a pyrolyzer furnace that oxidizes the sulfur molecules in the sample to produce SO2. The sample then flows into a fluorescence chamber in which the pulsed UV light excites the SO2 molecules. The ultraviolet concentrating lens focuses the pulsed light onto the mirror assembly. The mirror set consists of four selected mirrors that reflect only the wavelengths that excite SO2 molecules. Because the excited SO2 molecules decompose to lower energy states, they emit UV light that is proportional to the total concentration of sulfur in the sample. The pass-through filter allows only the wavelengths emitted by the SO2-excited molecules to reach the PMT, which detects the emission of UV light. The image detector, located behind the fluorescence chamber, continuously monitors the pulsed UV light source to compensate for UV light fluctuations. The measured SO2 concentration (representative of total sulfur in the sample) is processed, displayed on the front screen and sent to analog outputs.
PUVF Detector :
The PUVF detector includes and controls:
- UV pulsed light and related systems
- Control chamber temperature control
- Digitize PMT signal
- Smoothing the measured signal using the moving average
Measurement of total sulfur by PUVF detection method requires the conversion of all sulfur compounds in the sample to SO2. This is usually done with a pyrolyzer, an electric heating furnace designed by Thermo Fisher Scientific. Pyrolyzers typically operate at 1100 ° C (2012 ° F) to oxidize sulfur without the need for a catalyst.
The Perma Pure dryer removes moisture from the sample before entering the PUVF detector. A filter is placed before the dryer to protect it from impurities. The dryer tube consists of several small tubes housed in a large outer tube. Air circulates through the outer tube and the sample passes through the inner tube. Moisture passes through the sample through the tube, where it is transferred to the condensate by the air flow in the outer tube.
The mixing chamber mixes the gases and allows the sample to evaporate to a gaseous state before entering the pyrolyzer.
The injection valve periodically injects the exact measured values of the sample flow into the controlled carrier air flow. An auxiliary airflow is added to the sample and the air mixture. The sample is then transferred to a mixing chamber, where it is evaporated (if necessary) and thoroughly mixed with air.
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