Description.and.features.of.type.8692/8693; General.description; Features - Burkert 8692 Operating Instructions Manual

Type 8692, 8693
Description of System
5 DESCRIPTION AND FEATURES OF TYPE
8692/8693
5.1 General description
Positioner Type 8692 / process controller Type 8693 is an electropneumatic position controller for pneumatically
actuated control valves with single-acting or double-acting actuators. The device incorporates the main function groups
- Position sensor
- Electro-pneumatic control system
- Microprocessor electronics
The position sensor measures the current positions of the continuous valve.
The microprocessor electronics continuously compare the current position (actual value) with a position set-point
value specified via the standard signal input and supplies the result to the positioner.
If there is a control difference, the electro-pneumatic control system corrects the actual position accordingly.
5.2

Features

• Models
- Positioner (position controller) Type 8692
- Process controller with integrated position controller, Type 8693
Types 8692 and 8693 are available for both single-acting and double-acting actuators.
• Position.sensor
A non-contact and therefore wear parts position sensor.
• Microprocessor-controlled.electronics
For signal processing, control and valve control.
• Control.module
Operation of the device is controlled by four keys. The 128 x 64 dot matrix graphics display enables you to
display the set-point value or actual value and to configure and parameterize via menu functions.
• Control.system
. . F or low air flow rate:
The direct-acting model has an orifice of DN 0.6.
The control system for single-acting actuators consists of 2 solenoid valves and of 4 solenoid valves for double-
acting actuators. In single-acting actuators, one valve serves for the aeration and another for the deaeration of
the pneumatic actuator. Double-acting actuators feature 2 valves for aeration and deaeration.
For high air flow rate:
Orifice DN 2.5 is also available for pneumatic actuators (single-acting only).
The solenoid valves are equipped with diaphragm amplifiers to increase the maximum flow and therefore to
improve the dynamics.
• Position.feedback.(optional)
Position feedback is implemented either via a proximity switch (initiator), via binary outputs or
via an output (4 ... 20 mA / 0 ... 10 V).
When the valve reaches an upper or lower position, this position can be relayed e.g. to a PLC via binary outputs.
The initiator is used to set the upper and lower end position of the valve. It can be changed with a setting screw.
• Pneumatic interfaces
1/4" connections with different thread forms (G, NPT) of hose plug-in connection.
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