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