Hydrogen has the characteristic of being colorless and odorless. When burned in the air, the flame turns blue and is difficult to detect, making it difficult for humans to detect hydrogen leaks. Hydrogen has a low gas density and can escape into the air after leakage. When the concentration of hydrogen in the air is high, it is prone to explosion when exposed to heat or open flames. There is a risk of leakage in many aspects of hydrogen production, storage, transportation, and use. Therefore, special attention should be paid to hydrogen leakage detection to prevent accidents caused by hydrogen leakage. In the hydrogen related process, safety can be ensured through hydrogen leakage alarm devices. Suitable for hydrogen production plants, refueling stations, hydrogen storage, petroleum, chemical, pharmaceutical, steel, gas storage stations, and special industrial buildings where hydrogen leakage may occur.