Burkert 309054 (Type 8681) control head for decentralized automation of hygienic process valves.

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.

Key Features

• Contactless position measurement system with 3 switching points (Teach-In function)
• Universal attachment for hygienic process valves
• Coloured status display
• AS-Interface communication
• Manual override operative with closed housing

General Technical Data

Product properties
Material
Body	PA, PPO, VA, stainless steel
Cover	CR, EPDM
Seal	PC, PSU
Operation
Operating keys	Teach keys
DIP switch	Yes
Position sensor
Analogue position sensor	Inductive (contactless), 3 self-regulated switching points PNP
Stroke range for linear actuator
Valve spindle	0...80 mm
Pneumatic data
Control medium	Neutral gases, air, quality class according to ISO 8573 - 1
Supply pressure	2.5...8 bar
Pilot air port	G 1/4 (Air inlet and outlet), G 1/8 (Service port)
Environment and installation
Ambient temperature	-10 to +55 °C (+5 to +55 °C in Ex atmosphere (Zone 2))
Degree of protection	IP65/IP67 according to EN 60529

AS-Interface Electrical Data

Electrical data
Profile	S-7.A.E (AB slave max. 62 slaves/master) or S-7.F.F (max. 31 Slaves/Master)
Operating voltage	19.2 V DC to 31.6 V DC
Maximum current consumption	<160 mA (including external initiator with 30 mA)
Output contact rating	Max. 0.9 W per solenoid valve for 200 ms after switching on
Operating mode	Continuous operation (100 % duty cycle)

Materials

No.	Element	Material
1	Cover	PC, PSU
2	Seals	EPDM, CR
3	Cable glands	PA
4	Fluid part	PPO
5	Screws/Threaded ports	Stainless steel
6	Lower part of body	PPO
7	Screws/Threaded ports	Stainless steel

INFO

PC cover material: only for ATEX and FM appliances.

Dimensions

::: note Dimensions in mm. :::