The detection process of the analyzer is based on the principle of ultraviolet fluorescence method. The sample gas after the H2S in the air is converted into SO2 according to a certain conversion efficiency. Under the action of the SO2 gas molecules irradiated by the Zn lamp, it becomes the excited state SO2. When the excited state SO2 molecule returns to the ground state, it emits fluorescence. By measuring the change of fluorescence intensity, the concentration of SO2 in the sample gas can be measured, and finally converted to the concentration of H2S through the formula. The latest photoelectric technology is used in the analyzer, which can improve the technical performance and improve its reliability and stability. The analysis results can be directly displayed on the LCD on the front panel, and can also be uploaded to the local data receiving center through the network. Hydrogen sulfide has become an important air quality index and routine measurement item in environmental monitoring stations all over the world. This machine also provides an indispensable instrument and means for industrial and mining enterprises and colleges and universities in environmental air quality monitoring and scientific research.