Instrument Principle
This instrument adopts the ultraviolet fluorescence method. The basic working principle is: a zinc lamp emits ultraviolet light, filtered by a monochromatic filter to monochromatic light at 214nm wavelength 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 strength 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 measures the excited fluorescence intensity as the sample gas optical path, the other measures the reference optical path, monitoring changes in the zinc lamp light source and 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 and English 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, 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;
◆AC/DC dual power supply, one charge can be used for more than 10 hours;
◆Can be preheated in advance, ready for rapid monitoring upon arrival at the site;
◆Suitable for emergency monitoring and comparison monitoring.
