Bürkert Control Head for Decentralised Automation of ELEMENT Process Valves Type 8691

The device Type 8691 control head is designed for decentralised automation of ELEMENT Type 21xx pneumatic process valves. The valve position is registered via a contact-free, analogue sensor element which automatically detects and saves the valve end position using the Teach function during start-up. The integrated pilot valve controls single or double-acting actuators. An optional communication interface, AS-Interface, IO-Link or büS (based on CANopen) can be selected. The design of the control head and the actuator permits integrated pilot air duct without external piping. Besides the electrical position feedback, the device status is shown directly on the control head itself through coloured powerful LEDs, even in difficult ambient conditions. The housing is easy to clean and features proven IP protection and chemically resistant materials for use in hygienic processing in the food, beverage and pharmaceutical industries. Focused on plant wash-down applications, the IP protection of the housing is supported by positive pressure inside the control head. Combined with Bürkert ELEMENT actuators, the pneumatic actuating system enables spring chamber aeration that avoids actuator chamber contamination from the environment.

Body

PPS, stainless steel

Seal

EPDM

Configuration tool

Bürkert Communicator

Setting of valve end position

Through automatic or manual teach function

Display of the device and valve status

High performance LEDs (colours individually adjustable

Fieldbus

AS-Interface, IO-Link

Digital

Bürkert system bus (büS) (based on CANopen)

Valve spindle

2.5…45 mm

Multipole variant

M12, 8-pin or 5-pin according to device variant

Cable bushing variant

M16 × 1.5 (terminal range 5…10 mm) with screw-type terminals for cable cross sections

Control medium

Neutral gases, air, quality class according to ISO 8573 - 1

Dust content

Class 7 (particle size < 40 µm)

Particle density

Class 5 (< 10 mg/m3)

Pressure dew point

Class 3 (≤ - 20 °C or min. 10 °C below the lowest operating temperature)

Oil content

Class X (< 25 mg/m3)

HS Code

8481.80

• Burkert 8691
• Buerkert 8691
• Bürkert 8691
• Type 8691
• Burkert Type 8691