The control head Type 8681 is optimized for decentralised automation of hygienic

process valves. Thanks to its universal adapter it can be combined with all normal

commercial butterfly valves, ball valves, single and double seated valves.

With a decentralised automation concept, the control head takes over all pneumatic

actuation, feedback and diagnostic functions including field bus communication.

The housing is easy to clean and features proven IP protection and chemically

resistant materials for use in hygienic processing in food, beverage and pharmaceutical

industries.

Depending on the process valve type, up to 3 pneumatic actuator chambers

can be controlled independently from each other. The switching speeds of both

movement directions can be set separately. A built-in check valve prevents incorrect

switching of process valve actuator chambers which could result from

back-pressure.

The process valve switching positions are detected by an inductive, analogue

position sensor and reported to the PLC system. Up to 3 switching points can be

adjusted automatically by a Teach-In function. Additionally a fourth switching

position can be read in and fed back via an external inductive proximity switch. The

coloured status display signals the particular process valve switching position or

indicates a diagnostic function such as maintenance required status or fault conditions.

The pilot valves are equipped with a manual override. If the device housing is

closed, the patented magnetically encoded manual override tool can be used to

open the process valve from the exterior. Bus communication is available with

AS-interface, IO-Link or büS/CANopen.

Type description