Page 249 - Bürkert
P. 249
Digital electropneumatic Positioner for the integrated
mounting on process control valves
8694 Basic version for Ø 70-225 mm
• Digital smart positioner
• Automatic teach function
• Contact-free position sensor
• Compact stainless steel design
• AS-Interface communication (option)
• Internal control air routing
Compact positioner for integrated mounting on pneumatically operated Dimensions [mm] (see datasheet for more details)
process valves. Remote setpoint adjustment via a 4-20 mA signal or
through AS-Interface. Without intrinsic compressed air consumption dur-
ing steady state.
A contact-free analog position sensor measures the position of the valve
spindle.
Simple installation through automatic tune function and setting through
DIP-switch:
• Close tight function
• Characteristic curves selection
• Reversal of effective direction
• Switching manual /automatic operation
• Binary input B
C
Additional parametrisation options are possible through DTM devices.
A
A software interface can be used for, amongst others, lionization of the
operation characteristics by using free programmable fixed points.
The valve position indication is shown through LED components.
As an option an analogue position feedback can be integrated.
A B C
91 115.4 54
Technical Data
Material
Body PPS, stainless steel
Cover PC Technical Data (cont .)
Sealing EPDM
Power supply 24V DC ±10% Actuator system Low air flow rate: Ø Actuator 70/90 mm
Actuator series
Residual ripple Max. 10% ELEMENT 23XX High air flow rate: Ø Actuator 130 mm
Setpoint setting 4-20 mA Actuator series Low air flow rate: Ø Actuator 80/100 mm
(0-20 mA adjustable via communication CLASSIC 27XX High air flow rate: Ø Actuator 125/175/225 mm
interface) Position detection module Contact-free, wear-free
Output resistance 180 Ω Stroke range valve spindle 3-45 mm
Control medium neutral gases, air DIN ISO 8573-1 Installation as required, preferably with actuator in upright
Dust concentration Class 5 (<40 µm particle size) position
3
Particle density Class 5 (<10 mg/m ) IP65 and IP67 acc. to EN 60529
Pressure condensation point Class 3 (<-20 °C) Type of protection
3
Oil concentration Class 5 (<25 mg/m ) Protection class 3 acc. to VDE 0580
Ambient temperature 0 °C to +60 °C Conformity CE acc. to EMV2004/108/EG
Pilot air ports Threaded ports G 1/8” stainless steel or Options Analogue position feedback, 4-20 mA
Push-in connectors (Ø 6 mm and 1/4” tube) Communication AS-Interface (option, in preparation)
Supply pressure Low air flow rate 0-7 bar 1) The supply pressure has to be 0.5-1 bar above the minimum required pilot pressure for the
1)
High air flow rate 3-7 bar valve actuator.
(in preparation)
Air input filter Exchangeable (mesh aperture ~0.1 mm)
248