Intelligent positioner
ARCA-Regler

A linear function between the input signal and stroke is the best way to ensure maximum control precision. Control valves with pneumatic actuators, however, are subject to friction, media pressure, and high flow forces, which means that this linearity is not intrinsic in the system. Only a positioner can eliminate positioning errors by comparing the input signal with the actual stroke and by yielding the actuating pressure for the actuator.

Positioner mounting to IEC 534 (NAMUR)
The standard mounting method (to IEC 534) is based on manufacturer-neutral mechanical interfaces with the actuator lantern and stem. A bracket is normally used to secure the positioner, while the feedback lever comprises a lever with a spring element. The intake air is connected to the positioner, while the pneumatic connection with the actuator is realized by means of a pipe or hose.