Control head 8681 for decentral automation of hygienic process valves |
With the 8681 Bürkert presents a new control head which has been specially optimized for decentral automation of pneumatically controlled hygienic process valves. It is universally adaptable and can be combined with all commercially available valve types, such as butterfly valves, ball valves and single and double-seat valves. The company said the control is suited for hygienic applications as it's made of chemical resistant materials and features time-tested IP protection.
Within the framework of decentral automation concepts the 8681, as a central unit, performs all pneumatic actuation, feedback and diagnostic functions, as well as bus communication. Depending on the process valve, as many as three pneumatic actuator chambers can be controlled separately.
The 8681 control head has been specifically developed for decentral automation of hygienic seat valves, butterfly valves and ball valves. It supplements the Bürkert ELEMENT series of control heads, digital positioners and process controllers for diaphragm, angle seat and globe valves and rounds out the automation portfolio for the food/beverage and pharmaceutical industries.
The respective switching positions of the process valve are measured by the control head via an inductive analog position sensor and transmitted to a PLC. After installation of the control head on the valve actuator the switching positions are automatically determined by a fast and reliable teach-in function, which eliminates the need for manual configuration. A fourth switching position can be read in by an externally mounted inductive proximity switch. The switching speed of each driver chamber can be set individually for both directions of movement by means of a restrictor function integrated in the pilot valve.
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