Abstract: The invention relates to an electric field device (10) with an ignition protection-type pressure-tight encapsulation for use in explosion-prone regions for controlling and/or regulating a valve unit of a process system, comprising a housing (12), in which a control unit (48) that comprises electronic components and is used as a monitoring, control, and/or regulating unit is arranged, said control unit (48) having a releasable communication connection to an operating unit (62). The housing (12) can be connected to a drive housing of the valve unit via a mechanical interface (42), and the housing has at least one connection feedthrough (44), via which at least one line can be connected that is connected to the control unit (48) via a connection interface (46).