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Description of System
• Mounting
on linear actuator according to NAMUR recommendation (DIN IEC 534-6) or on rotary actuator according to
VDI/VDE 3845.
• Optional
Remote version for DIN rail mounting or for mounting bracket
5.1.2. 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 compressive
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 pressurised. In this case, one
chamber is aerated when the other one is deaerated and vice versa. In this design, no spring is installed in the
actuator.
Two basic device versions are offered for the positioner Type 8792 / process controller Type 8793; they differ in
the attachment option and in the position sensor.
Device version NAMUR:
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.
Device version Remote:
An extern position sensor (linear or rotative) via a digital interface.
The Type 8792/8793 is attached to a wall either with a DIN rail or with a mounting bracket (remote design).
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