Product Description
Control head for decentralised automation of hygienic process valves
The control head Type 8681 is optimised for decentralised automation of hygienic process valves. Universal adaptation allows it to be combined with all standard butterfly valves, ball valves, and single and double seat valves. In the decentralised automation concepts, the control head takes over full pneumatic control, feedback and diagnostics functions, including bus communication. The body is very easy to clean, has proven IP protection and chemically-resistant materials for use in hygienic processing plants in the beverage, food and pharmaceutical industries. Depending on the process valve used, up to 3 pneumatic actuator chambers can be controlled independently of each other. The switching speeds for both directions of movement can be set separately. A built-in check valve prevents switching errors in process valves due to back pressure. The process valve switch positions are recorded by the inductive, analogue position sensor and fed back to the higher-level controller. Up to 3 switch points can be set via the teach function at the push of a button or automatically determined by predefined X.TUNE functions. In addition, a fourth switch position can be detected and fed back via an external inductive proximity switch. The coloured device status LED signals the respective switch position of the process valve and diagnostic functions such as maintenance required or fault conditions. The pilot valves are equipped with a mechanical manual override. If the device is closed, the patented magnetically encoded manual override allows the main actuator to be switched from outside. Bus communication is possible with AS-Interface, IO-Link or büS/CANopen.
Technical data
Device & function (9)
| Type |
8681 |
| Product sub-group |
Control head / position feedback |
| Function |
Control head |
| Manual actuation |
Yes |
| Displacement transducer type |
internal linear |
| Displacement transducer signal |
digital |
| Suitable for actuator sizes |
40, 50, 63, 70, 80, 90, 100, 125, 130, 175, 225 mm |
| Control interface |
DIP switch |
| Mounting type |
3rd party actuator |
End position feedback (7)
| End position feedback internal |
3 PCE |
| End position feedback external |
1 PCE |
| End position feedback type |
Inductive position sensor teachable PNP |
| End position feedback DC voltage |
Yes |
| End position feedback AC voltage |
No |
| End position feedback top |
yellow |
| End position feedback bottom |
green |
Pneumatics (5)
| Pneumatic function 1 double acting |
No |
| Pneumatic function 1 single acting |
Yes |
| Valve diameter |
4 mm |
| QNn value (gas) |
110 l/min |
| Main valve with integrated filter |
Throttle with screw slot |
Pneumatic connections (9)
| Port connection 1 type |
Internal thread |
| Port connection 1 thread type |
G |
| Port connection 1 thread marking |
1/4 |
| Port connection 2 type |
Internal thread |
| Port connection 2 thread type |
G |
| Port connection 2 thread marking |
1/8 |
| Port connection 3 type |
Internal thread |
| Port connection 3 thread type |
G |
| Port connection 3 thread marking |
1/4 |
Communication & electrical (12)
| Electrical connection sort |
Plug - M12 |
| Electrical connection type |
male |
| Electrical connection wire length |
100 mm |
| Electrical connection material |
Stainless steel |
| Voltage min / rated voltage |
29,5 V |
| Voltage max / rated voltage |
31,6 V |
| Supply system-internal |
No |
| Supply via BUS |
Yes |
| Supply via separating barrier |
No |
| AC voltage |
No |
| DC voltage |
Yes |
| Communication interface protocol |
ASi |
Inputs & outputs (2)
| Input 1 type digital |
serial (bus) |
| Output 1 type digital |
serial (bus) |
Temperature & protection (3)
| Temperature environment min |
-10 °C |
| Temperature environment max |
55 °C |
| Protection type IP (max. with suitable connector) |
IP65/67 |
Approvals (2)
| Approval type |
UL |
| Certification type |
UL Listed cULus |
Shipping & customs (4)
| Weight |
0,805 kg |
| Customs tariff number |
90268020 |
| Country of origin |
Germany |
| Export |
Not subject to export licensing |
Product benefits
- Universal actuator adaptation for hygienic process valves
- Contactless position sensor system with 3 switching points (teach function)
- Coloured device status LED
- Manual override operative with closed housing
- AS-Interface, IO-Link, büS/CANopen
Your Benefits With Us
- Worldwide shipping of all valves and flow meters
- Large stock levels for many products – current lead time available on request
- Spare parts and service kits available
- Fast shipping via UPS (parcel) or freight forwarder (pallets), express delivery available on request
- Extensive hands-on application know-how
- Personal advice on selecting the right component
- Resellers receive volume-based discounts on request
- Large companies, public authorities and government agencies can order on account (request via our contact form)
