Bürkert 8696, Operating Instructions Manual, Page: 15 / 75

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System description
5.5.2 Features
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Models
for single-acting valve actuators.
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Position sensor
Contactless and therefore non-wearing position sensor.
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Microprocessor-controlled electronics
for signal processing, control and valve control.
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Control module
The operation of the device takes place via 2 buttons and Bürkert Communicator.
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Pilot valve system
The control system consists of 2 solenoid valves. One valve is used to aerate and another to deaerate the
pneumatic actuator. The solenoid valves operate according to the rocker principle and are controlled with
a PWM voltage via the controller. Doing so achieves a higher flexibility with regard to actuator volume and
final control speed. The direct-action model has an orifice of DN 0.6.
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Position feedback
The position of the valve can be transmitted to the PLC via an analog 0/4-20 mA output (variant, without
fieldbus communication) or digitally via a fieldbus communication (e.g. büS, IO-Link).
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Digital input (for variant without fieldbus communication)
If a voltage > 10 V is applied, safety position ( SAFEPOS) is activated, i.e. the valve is moved to the safety
position (factory setting, can be changed with communications software).
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Pneumatic interfaces
hose plug-in connection ∅ 6 mm / 1/4“
on request: threaded port
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Electrical interfaces
Circular plug-in connection
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Housing
The housing of the positioner is protected from excessively high internal pressure, e.g. due to leaks, by a
pressure limiting valve.
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Communications interface
For exchanging process data and for configuration and parameterization.
english
Type 8696, REV.2