Control head for decentralized automation of hygienic process valves
Type 8681 / Article No. 261484
Product description
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, DeviceNet, IO-Link or büS/CANopen.
- Commodity Codes
- 90268020
- Country
- DE
Technical attributes
Name |
Value |
Unit |
---|---|---|
Type | 8681 | |
Product sub-group | Control head / Position indicator | |
Function | Control head | |
Valve function manual actuation | Yes | |
Pneumatic pilot valve 1 | 6144 | |
Pneumatic pilot valve 2 | 6144 | |
Pneumatic function 1 double acting | No | |
Pneumatic function 1 single acting | Yes | |
Pneumatic function 2 double acting | No | |
Pneumatic function 2 single acting | Yes | |
Pneumatic function 3 double acting | No | |
Pneumatic function 3 single acting | Yes | |
Valve diameter | 4 | mm |
Valve 2 diameter | 4 | mm |
Valve 3 diameter | 4 | mm |
QNn value (gas) | 110 | l/min |
QNn value 2 (gas) | 110 | l/min |
QNn value 3 (gas) | 110 | l/min |
Temperature environment min | 5 | °C |
Temperature environment max | 55 | °C |
End position feedback internal | 3 | PCE |
End position feedback external | 1 | PCE |
End position feedback type | Inductive displacement transducer PNP | |
End position feedback voltage min | 0 | V |
End position feedback voltage max | 24 | V |
End position feedback current min | 0 | A |
End position feedback current max | 0,1 | A |
End position feedback DC voltage | Yes | |
End position feedback AC voltage | No | |
End position feedback top | yellow | |
End position feedback bottom | green | |
Displacement transducer type | internal linear | |
Displacement transducer signal | digital | |
For Actuator size 40 mm | Yes | |
For Actuator size 50mm | Yes | |
For Actuator size 63mm | Yes | |
For Actuator size 70mm | Yes | |
For Actuator size 80mm | Yes | |
For Actuator size 90mm | Yes | |
For Actuator size 100mm | Yes | |
For Actuator size 125mm | Yes | |
For Actuator size 130mm | Yes | |
For Actuator size 175mm | Yes | |
For Actuator size 225mm | Yes | |
Main valve with integrated filter | Choke with screw slot | |
Port connection 1 type | Inner thread | |
Port connection 1 thread type | G | |
Port connection 1 thread marking | 1/4 | |
Port connection 2 type | Inner thread | |
Port connection 2 thread type | G | |
Port connection 2 thread marking | 1/8 | |
Port connection 3 type | Inner thread | |
Port connection 3 thread type | G | |
Port connection 3 thread marking | 1/4 | |
Electrical connection sort | Screw terminal with cable feed-through | |
Voltage / rated voltage | 12 | V |
Voltage / rated voltage | 28 | V |
Supply system-internal | No | |
Supply via BUS | No | |
Supply via separating barrier | No | |
AC voltage | No | |
DC voltage | Yes | |
Input 2 type digital transistor connection NPN | No | |
Input 2 type digital transistor connection PNP | Yes | |
Output 2 digital transistor connection NPN | No | |
Output 2 digital transistor connection PNP | Yes | |
Control interface | DIP switch | |
Mounting type | 3rd Party actuator | |
Protection type (IP max. with suitable connector) | IP65/67 | |
Weight | 0,845 | kg |
Approval type | FM | |
Certification type | NI_Class I_Division 2, NI_Class I_Division 2 - USA |
Applications & Tools
Downloads
Data Sheets
User Manuals
Software
Description |
Filesize |
Language / Country |
|
---|---|---|---|
![]() |
Buerkert Communicator 5.1.3 | 536 MB | ML |
![]() |
Initiation Files EDS IODD A.04 | 4 MB | ML |
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PC-Programm Typ 8681 2.19 | 2 MB | ML |
EU Declaration of Conformity
Certificates/Manufacturer Declarations
Description |
Filesize |
Language / Country |
|
---|---|---|---|
![]() |
ASi | 100714 | 8681 | 220 kB | EN |
![]() |
IO-Link | | 8681 | 324 kB | EN |
![]() |
IO-Link | | 8681 | 328 kB | EN |