Type 8681 control head for decentralised automation of hygienic process valves (AS-Interface, IO-Link, CANopen)
Country: Germany · Model: 8681
The Type 8681 control head turns a hygienic process valve into a self-contained automation unit. It sits on the actuator and handles pilot control, position feedback, diagnostics and bus communication, driving up to 3 pneumatic actuator chambers independently. It is used on dairy, brewery, food and pharmaceutical lines.
- Function
- Control head for hygienic process valves: pilot control, position feedback, diagnostics, communication
- Compatible valves
- Butterfly, ball, single-seat and double-seat valves (universal adapter)
- Actuator chambers controlled
- Up to 3, independently
- Circuit function
- Single-acting and double-acting
Technical specifications
| Function | Control head for hygienic process valves: pilot control, position feedback, diagnostics, communication |
|---|---|
| Compatible valves | Butterfly, ball, single-seat and double-seat valves (universal adapter) |
| Actuator chambers controlled | Up to 3, independently |
| Circuit function | Single-acting and double-acting |
| Position sensor | Inductive analogue, contactless; 3 switching points by Teach-In, 4th via external proximity switch |
| Stroke range | 0–80 mm |
| Resolution | ≤ 0.1 mm |
| Total error | ± 0.5 mm |
| Supply pressure | 2.5–8 bar |
| Control medium | Neutral gases, air (ISO 8573-1: dust class 7, dew point class 3, oil class X) |
| Air flow | 110 lN/min (aeration/ventilation), up to 200 lN/min |
| Pneumatic ports | Pilot air G1/4, service port G1/8 |
| Operating voltage | 12–28 V DC or 110–130 V AC 50/60 Hz (versions without fieldbus); via bus for AS-Interface |
| Power consumption | < 5 W (24 V DC version) |
| Communication | AS-Interface, IO-Link, CANopen-based system bus; or discrete 24 V DC / 120 V AC |
| Feedback outputs | PNP, normally open, short-circuit proof, max. 100 mA per signal (24 V DC) |
| Electrical connection | M12 12-pin plug or M16 × 1.5 cable gland |
| Status display | High-power LEDs, colours adjustable |
| Manual override | Magnetically coded, operable with closed housing |
| Materials | Body PA, PPO, stainless steel; cover PC, PSU; seals CR, EPDM |
| Degree of protection | IP65 / IP67 (EN 60529) |
| Ambient temperature | −10…+55 °C (+5…+55 °C in Ex Zone 2) |
| Explosion protection | ATEX II 3 G Ex ec IIC T4 Gc X; II 3 D Ex tc IIIC T135 °C Dc X |
| North America | cULus listed; FM nonincendive Class I, Division 2, Groups A–D |
| Operating altitude | Up to 2000 m |
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
Mounted on the valve actuator, the head removes long pneumatic lines and separate valve terminals from the control cabinet. A universal adapter fits butterfly valves, ball valves, and single- and double-seat valves, and the switching speed is set separately for each direction of travel. A built-in check valve stops back pressure from switching a chamber by mistake. An inductive analogue sensor measures position without contact over a 0–80 mm stroke with a resolution of 0.1 mm, and three switching points are learned with Teach-In. High-power LEDs show valve position and states such as maintenance due or a fault. A magnetically coded tool works the manual override with the housing closed. The housing is rated IP65 / IP67 and uses chemically resistant materials.
How to choose
The deciding points are the valve type and the supply and communication variant. Versions exist for 24 V DC or 120 V AC without fieldbus, and with AS-Interface, IO-Link or a CANopen-based system bus. Check how many actuator chambers your valve has, because the head controls up to 3. Send the valve type and actuator data to a USK ENERGY manager to confirm the exact version.
Request a price and lead time
Type 8681 control head for decentralised automation of hygienic process valves (AS-Interface, IO-Link, CANopen). We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
Which fieldbus options does the Type 8681 control head offer?
AS-Interface, IO-Link and a CANopen-based system bus, or discrete 24 V DC and 120 V AC control without fieldbus.
What protection rating and approvals does it have?
The housing is rated IP65 / IP67. Approvals include ATEX Zone 2/22 and cULus with FM nonincendive rating for Class I, Division 2.
What supply pressure and control medium does it need?
Supply pressure is 2.5–8 bar, with neutral gases or air to ISO 8573-1 (dust class 7, dew point class 3, oil class X).
How is the valve position measured?
By a contactless inductive analogue sensor over 0–80 mm with a resolution of 0.1 mm and a total error of ± 0.5 mm. Three switching points are set by Teach-In.
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Need a price, lead time or replacement?
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