The unit is composed of a Roots pump as the main pump and a scroll pump as the preliminary pump in series. It features a compact structure and easy operation. It is suitable for extracting air and other non-condensable and non-corrosive gases, widely used in various vacuum systems requiring high pumping speed and high vacuum. Applications include vacuum smelting, electric capacitors, transformers, vacuum impregnation treatment, and preliminary pumping in vacuum coating equipment.

　　■Characteristics curve

　　Performance and specifications