Page 221 - Bürkert

SideControl Positioner

8635

• Electropneumatic positioner for
pneumatically actuated process valves
• Optional for use in hazardous areas
II (1) 2 G EEx ia IIC T6 approval

The SideControl Positioner, Type 8635, is an electropneumatic positioner Dimensions [mm] (see datasheet for more details)
for pneumatically actuated process valves with linear or part-turn actua-
tors. It is excuted in two conductor technology. Signal processing, control
B
and actuation of the internal positioning system are accomplished with
microprocessor-controlled electronics. The software function Autotune
implemented therein enables automatic adaptation of the positioner to
the control valve in use.
The positioner is parametrized and operated comfortably via three operat- A
ing keys and a plain-text display. It is possible to set up a decentralized
control system if a process controller with PID characteristics is used.

Technical Data C
Body material Aluminium, hard anodized and plastic coated
Other external parts Stainless steel V4A
Seal material NBR, Neoprene
Control medium neutral gases
Processing DIN ISO 8573-1
Dust content Class 5 (≤ 40 µm particle size)
Particle density Class 5 (≤ 10 mg/m³)
Pressure dew point min. 10 °C under min. operating conditions A B C
Oil concentration Class 3 (≤ 1 mg/m³) 173.5 91.83 123
Control air temperature -25 °C to +60 °C 1)
Ambient temperature -25 °C to +60 °C 1)
Supply pressure 1.4-6 bar 3)
Air flow capacity 2) 55 l/min at 1.4 bar 3)
3)
Control valve 170 l/min at 6 bar for pressurizing and venting Technical Data (continued)
Intrinsic air consumption 0 l/min Mounting kits NAMUR recommendation
Positioning range for linear actuator acc. to DIN IEC 534 T6
Linear actuator 3-130 mm for part-turn actuator acc. to VDI/VDE 3845
Part-turn actuator 0-120° Weight ca. 1.5 kg
Position sensor system High-resolution conductive plastic rotary
potentiometer Protection class IP65 acc. to EN 60529
Operation Operating keys and plain-text display Type of ignition protection II (1) 2 G EEx ia IIC T6 acc. to
DIN EN 50020
Electrical connection 2 x M20 x 1.5-bushing
Clamping range 6-12 mm Certification acc. to ATEX 2027 (PTB04)
Screw terminals for 0.14-1.5 mm² Conformity EMV-89/336/EWG
Electrical data
Type 8635
Current supply via setpoint signal
for electronics 4 ... 20 mA
Burden voltage < 10.2 V DC
Setpoint setting 4 ... 20 mA
Control air sockets G 1/4 Options
NPT 1/4; RC 1/4 on request
• Universal integrated attachment (air conduction without piping)
1) Up to +65 °C temperature class T4/T5 or without EEx i approval.
• Manometer VA (supply and drive chamber),
2) May be adapted to actuator size with throttle screw.
3) Pressure data in bar; overpressure to atmospheric pressure • Switches according to NAMUR as limit switches (optional)
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