The pumps adopt preprogrammed automatic control by phase and use the technology of air condensation ,separation and purification by step , producing highly pure quality air with characteristics of little noise and unobstructed operation . Under any circumstances it can operate quietly and stably , producing quality pure and clean air with the pressure and flow adjustable , which are ideal small-sized air equipment. The gas purity of QL-10L/20L is higher, and the gas output is larger. It's more suitable for spectrum analysis and atomic adsorption.