Use: This unit is used to vacuum-pump of the electrical vacuum device in transformer substation, administration of power supply, power generation plant, and transformer manufactory, and it can vacuum pump in vacuum melting, welding, drying, chemical pharmacy. ZJ operates in vacuum degree of 133Pa, and its limit vacuum degree is 5Pa. But it is are unsuitable for pumping toxic gas, explosive gas, high-oxygen content gas, high-moisture content gas, and the gas which will be reaction to pump oil or cause erosive effect on ferrous metal. Feature: (1)Quick starting, high pumping rate, stable performance, easy-handling. (2)The unit takes Roots Pump as main pump and spinning vacuum pump as pre-stage pump. (3)A vacuometer is used to meter and control vacuum of pumped container. (4)The unit adopts French Schineider Electric as control element. (5)Full-automatic and non-presence of operation with lamps indicating the condition of operation. (6)Humanization design, low noise, less energy expenditure, economical to circulate cost. Optional mode: (1)Available in mobile option, stationary option, and car-carrying option. (2)Kinds of purifiers can be made hermetical, open or canopy-covering. (3)The client's requirements can be met by adopting PLC intelligent and displaying dynamically. Wooden case.