The three level centrifuge and separation technology, Siemens S7 controlling system with Chinese and English operational languages is adopted in F series multi-effect water distiller. With standard collocated water inlet boosting pump and storage tank, buffer tank is optional. With standard collocated factory steam pressure-reducing valve. With device for discharging incondensable gas continuously. Discharging remained liquid continuously. Recording conductivity and valve position of WFI. With complete factory acceptance test for equipment manufacture.Adopting demineralized water or RO water for water inlet.