Page 253 - Bürkert

Control Head for the integrated mounting on process valves,
for the series 21XX

8695

• Compact stainless steel design
• Integrated analog valve position
registration (Teach function)
• Coloured illuminated status display

• Internal control air routing
• Fieldbus interface AS-Interface/
DeviceNet (option)

The control head, Type 8695, is optimised for integrated mounting on the Envelope Dimensions [mm] (see datasheet for details)
21XX process valve series with smaller actuator sizes.
The registration of the valve position is done through a contact-free
analog position sensor, which automatically recognises and saves the
valve end position through the Teach function when starting up. The
integrated pilot valve controls single or double-acting actuators.
The design of the control unit and the actuator is specially designed for
the requirements of a hygienic process environment and enables an inter-
nal control air channel without external tubings.
B
Besides the electrical position feedback signal the status of the device is
shown directly on the control head itself through coloured LEDs showing
a clear visible valve position status.
As an option a Fieldbus interface, AS-Interface or DeviceNet can be C
A
chosen.
Technical Data

Material A B C
Body PPS, stainless steel 77.2 123.9 80
Cover PC
Sealing EPDM
Control medium neutral gases, air DIN ISO 8573-1
Dust concentration Class 5 (<40 µm particle size)
Particle density Class 5 (<10 mg/m ) 3
Pressure condensation point Class 3 (<-20 °C) Technical Data continued
Oil concentration Class 5 (<25 mg/m ) 3
Supply pressure 0 to 7 bar 1) Power supply 24 VDC ±10%
Actuator system for single or double-acting actuators Residual ripple with DC 10%
Actuator series 21XX actuator ø 50 mm Power consumption < 2W
Pilot air ports Threaded ports G 1/8” stainless steel or
Push-in connectors (Ø 6 mm and 1/4” tube) Electrical connection M12, 8-pin
Position feedback Analog position sensor (contact-free) Mutlipole
with autotune switchpoint (PNP) (NPN on Output max. 100 mA per output
request)
Stroke range valve spindle 2.5 to 32 mm
Ambient temperature 0 to +55 ºC
Installation as required, preferably with actuator in
upright position
Protection class IP65/67 according to EN 60529
Protection class 3 according to VDE 0580
Fieldbus communication AS-Interface / DeviceNet
(option)
Conformity according to CE in compliance with
EMV2004/108/EG
1) The supply pressure has to be 0.5 - 1 bar above the minimum required pilot pressure for the
valve actuator.

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