There are a lot of security inspection devices in the world. For example, liquid scanner, cargo scanner, baggage scanner and security door are all effective devices widely applied in our life and industry. Among the security inspection devices, liquid inspection equipment is especially designed for detecting flammable and combustible liquids such as gasoline, isogamy acetate, ethanol, acetone and other chemical liquids which are organic solvents. Once the flammable and combustible liquids are detected by a liquid scanner, the liquid scanner will alarm. With liquid inspection equipment, we can no longer be afraid of the dangerous liquids carried on board. Therefore, how important the liquid inspection equipment is! There is no doubt that liquid inspection should be put in the same important place as the baggage inspection.