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Product description
Type 8792, 8793 REV.2
5.2.1
Combination with valve types and mounting versions
The positioner Type 8792 / process controller Type 8793 can be mounted on different continuous valves.
For example on valves with piston, membrane or rotary actuator. The actuators can be single-acting or
double-acting.
•
For single-acting actuators, only one chamber is aerated and deaerated during actuation. The generated
pressure works against a spring. The piston moves until there is an equilibrium of forces between com-
pressive force and spring force. To do this, one of the two air connections must be sealed with a threaded
plug.
•
For double-acting actuators the chambers on both sides of the piston are pressurized. In this case, one
chamber is aerated when the other one is deaerated and vice versa. In this variant, no spring is installed in
the actuator.
Two basic device variants are available for positioner Type 8792 / process controller Type 8793. They differ
as to the mounting options and the position sensor.
NAMUR device variant:
An internal position sensor is used which is designed as a rotary potentiometer.Type 8792/8793 is mounted
directly on the actuator or attached to the side.
Remote device variant:
An external position sensor (linear or rotary) is connected via an interface.Type 8792/8793 is attached to
a wall either with a standard rail or with a mounting bracket (remote variant).
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