Instrument Principle
This instrument adopts the ultraviolet fluorescence method. The basic working principle is: a zinc lamp emits ultraviolet light, which is filtered to monochromatic light (wavelength 214nm) and focused into the SO2 reaction chamber. SO2 in the sample gas absorbs ultraviolet light to produce energy level transition, SO2 changes from ground state to excited state. The excited SO2 is unstable and instantly emits fluorescence with a center wavelength of 330nm. The intensity of the fluorescence is proportional to the SO2 concentration. The photomultiplier tube converts the light signal into an electrical signal to measure the SO2 concentration. To eliminate measurement errors caused by optical path fluctuations, two monitoring paths are used in the optical path: one as the sample gas optical path to measure the excited fluorescence intensity, and the other as the reference optical path to monitor changes in the zinc lamp light source, automatically compensating for light source changes.
Instrument Features
• Adopts 7-inch full-touch color screen, monitoring values can be switched freely between ppb, ppm, μg/m³, mg/m³;
• Chinese menu-style operation interface, easy to operate;
• With automatic range switching function;
• Monitoring values can be displayed graphically, and graphic curves can be freely zoomed;
• With automatic temperature and pressure compensation function;
• Adopts adaptive optimization algorithm to achieve optimal response time and signal-to-noise ratio;
• Supports remote calibration and remote diagnosis of internal working parameters;
• Massive historical data storage, one year of valid data, query and output functions (one record every 5 minutes);
• With multi-parameter alarm function;
• Tracks and compensates the light intensity of the zinc lamp to improve light intensity stability.
