Page 261 - Bürkert

Pneumatic Control Unit with integrated position feedback

8697

• Compact design
• Integrated pilot valve with manual
override
• Integrated control air supply to the
actuator
• Bright LED as a position indicator
• Automatic end position adjustment

The 8697 pneumatic control unit is optimised for integrated mounting on Dimensions [mm] (see datasheet for more details)
the ELEMENT 21XX process valve and CLASSIC 20xx series. Mechani-
cal or inductive limit switches register the position of the valve. The
integrated pilot valve controls single-acting actuators.
The design of the control unit and the actuator enables an internal control
air routing without external tubings. Besides the electrical position feed-
back signal the status of the device is shown directly on the control head
itself via LEDs.
The housing is easy to clean and features proven electrical IP protec-
tion and chemically resistant materials for use in hygienic process ing, in
food, beverage and pharmaceutical industries. Combined with Bürkert
ELEMENT actuators the unique pilot valve system enables a compressed
C
air recycling that avoids actuator chambers contamination from the
environment. A
B
Technical Data
Materials
Body PPS A B C
Cover PC 65.4 56.3 110.4
Sealing EPDM
Operating voltage
Pilot valve 24V DC ±10% - residual ripple 10%,
consumption 1 W
Micro switch 24 V-Version: 0-48 V AC/DC, max. 2 A
230 V-Version: 50-250 V AC/DC, max. 2 A Technical Data (cont.)
Initiator 10-30 V DC - max.100 mA per initiator Ambient temperature
Control medium neutral gases, air quality class DIN ISO 8573-1 with/without pilot valve 0 ºC to +55 ºC
Dust concentration Class 5: max. particle size 40 µm (II 3D Ex tc IIIC T135 ºC Dc, II 3G Ex nA IIC T4 Gc)
Particle density Class 5: max. particle size 10 mg/m³ with/without pilot valve 0 ºC to +55 ºC
Pressure condensation point Class 3: max. -20 °C or min. 10 °C below the low- (II 2D Ex IIIC ia T135°C Db, II 2G Ex ia IIC T4 Gb)
est operating temperature with pilot valve -10 ºC to +55 ºC (II 2G Ex ia IIC T4 Gb)
Oil concentration Class 5: max. 25 mg/m³ without pilot valve -20 ºC to +60 ºC (II 2G Ex ia IIC T4 Gb)
Supply pressure 3-7 bar 1) Installation as required, preferably with actuator in upright
Pilot air ports Threaded ports G 1/8” or position
push-in connector (tube Ø 6 mm / 1/4”) Type of protection IP65 and IP67 acc. to EN 60529
Position feedback 2x micro switch (0-48 V AC/DC, max. 2 A) Protection class 3 acc. to VDE 0580
2x micro switch (50-250 V AC/DC, max. 2 A) Conformity acc. to CE in compliance with EMV 2004/108/EG
2x initiator (24 V DC), PNP shutter 3-wire II 3D Ex tc IIIC T135 ºC Dc
2x initiator NAMUR (8.2 V DC) (2-wire) Ignition protection II 3G Ex nA IIC T4 Gc
2x initiator (24 V DC), shutter (2-wire) II 3D Ex tc IIIC T135 ºC Dc
Stroke range valve spindle 2-36 mm II 2G Ex nA IIC T4 Gc
Electrical connection
Multipole M12, 8-pin
Cable gland M16x1.5 SW22 (cable diameter 5-10 mm),
terminal screws 0.14-1.5 mm²
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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