Type Switching controllers
Controlled variables Flow
 
 

Type 8691 positioners combine simply and reliably with Type 23xx/2103 process valve actuators, and are specially designed for hygienic process environments.

Recent implementation of two additional industrial network interfaces - IO-Link and büS  - makes it a universal tool for communications between valves and higher-level automation systems.

Coloured LEDs clearly show the valve position status with good visibility in both light and dark environments. Easy setup allows operators to regulate the valves by simply pressing a button, instead of having to make the more traditional mechanical adjustments that can be destabilising and time-consuming. Manual regulations are reduced to a minimum, while the valve maintains its integrity as a self-contained unit.

Features

  • Contact-free inductive valve position registration(Teach function)
  • Coloured illuminated status display
  • Integrated control air routing
  • IO-Link and büS network interfaces
  • Fieldbus AS-Interface or DeviceNet (option)
  • With ATEX II cat. 3G/D approval
  • close-tight function
  • inversion of the operating direction of the setpoint signal
  • characteristic curves selection
  • switching of manual/automatic operation

Operation

Functions are activated using push-buttons and DIP switches or a PC interface.

The position setpoint is set using the standard signal 4-20 mA. In addition, the enable can be controlled using the binary input and an optional position feedback can be integrated. Fieldbus communication can be provided via an optional AS-Interface.

The registration of the valve end position is done through a contact-free analog position sensor, which automatically recognises and saves the valve end position through the Teach function when starting up.

The integrated pilot valve controls single or double-acting actuators. As an option a fieldbus interface, AS-Interface or DeviceNet, can be chosen. The design of the control unit and the actuator enables an internal control air channel without external tubings. Besides the electrical position feedback signal the status of the device is shown directly on the control head itself through coloured powerful LEDs showing a clear visible valve position status, even under dirty or dark environments.

Maintenance

They meet the demands of plant washdown environments thanks to their compact design, materials used, external seals, and integrated control air supply to the actuator.

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.

Focused on wash down applications the IP rating is supported by a positive pressure inside the control head.

Benefits

Combined with Bürkert ELEMENT actuators the unique pilot valve system enables a compressed air recycling that avoids actuator chambers contamination from the environment.


Type 8691 positioners combine simply and reliably with Type 23xx/2103 process valve actuators, and are specially designed for hygienic process environments.

Recent implementation of two additional industrial network interfaces - IO-Link and büS  - makes it a universal tool for communications between valves and higher-level automation systems.

Coloured LEDs clearly show the valve position status with good visibility in both light and dark environments. Easy setup allows operators to regulate the valves by simply pressing a button, instead of having to make the more traditional mechanical adjustments that can be destabilising and time-consuming. Manual regulations are reduced to a minimum, while the valve maintains its integrity as a self-contained unit.

Features

  • Contact-free inductive valve position registration(Teach function)
  • Coloured illuminated status display
  • Integrated control air routing
  • IO-Link and büS network interfaces
  • Fieldbus AS-Interface or DeviceNet (option)
  • With ATEX II cat. 3G/D approval
  • close-tight function
  • inversion of the operating direction of the setpoint signal
  • characteristic curves selection
  • switching of manual/automatic operation

Operation

Functions are activated using push-buttons and DIP switches or a PC interface.

The position setpoint is set using the standard signal 4-20 mA. In addition, the enable can be controlled using the binary input and an optional position feedback can be integrated. Fieldbus communication can be provided via an optional AS-Interface.

The registration of the valve end position is done through a contact-free analog position sensor, which automatically recognises and saves the valve end position through the Teach function when starting up.

The integrated pilot valve controls single or double-acting actuators. As an option a fieldbus interface, AS-Interface or DeviceNet, can be chosen. The design of the control unit and the actuator enables an internal control air channel without external tubings. Besides the electrical position feedback signal the status of the device is shown directly on the control head itself through coloured powerful LEDs showing a clear visible valve position status, even under dirty or dark environments.

Maintenance

They meet the demands of plant washdown environments thanks to their compact design, materials used, external seals, and integrated control air supply to the actuator.

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.

Focused on wash down applications the IP rating is supported by a positive pressure inside the control head.

Benefits

Combined with Bürkert ELEMENT actuators the unique pilot valve system enables a compressed air recycling that avoids actuator chambers contamination from the environment.


Process controllers - all companies