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Product description
Type 8792, 8793 REV.2
5
PRODUCT DESCRIPTION
5.1
General description
The positioner Type 8792 / process controller Type 8793 is a digital, electro-pneumatic position controller
for pneumatically actuated continuous valves. The device incorporates the main function groups
- Position sensor
- Electro-pneumatic actuating 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 actuating system corrects the actual position
accordingly.
5.2
Properties
•
Variants
- Positioner (position controller) Type 8792
- Process controller with integrated position controller, Type 8793.
•
Position sensor
- internal conductive plastic potentiometer with high resolution or
- external non-contacting non-wearing position sensor (remote).
•
Microprocessor-controlled electronics
for signal processing, control and valve control.
•
Control module
The device is operated by 4 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.
•
Actuating system
The actuating system consists of 2 solenoid valves and 4 diaphragm boosters. In single-acting actuators
the working connection 2 must be sealed with a threaded plug.
•
Feedback (optional)
Feedback is either via 2 proximity switches (initiators), 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 operator can change the initiators or limit positions via control lugs.
•
Pneumatic interfaces
Internal thread G1/4"
•
Electrical interfaces
Circular plug-in connector or cable gland
•
Housing
Plastic coated aluminum housing with hinged cover and captive screws.
•
Attachment
to a linear actuator according to recommendation given by NAMUR (DIN IEC 534-6) or to a rotary actuator
according to VDI/VDE 3845.
•
Optional
Remote variant for DIN rail mounting or mounting bracket.
english
Summary of Contents for 8792
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