Samson positioner: The positioner ensures a predetermined assignment of the valve position (controlled variable x) to the input signal (set point w). It compares the input signal received from a control system to the travel or rotational angle of the control valve and issues a corresponding output signal pressure (output variable y).
![SAMSON POSITIONER + FOXBORO POSITIONER](http://www.techflowinc.com/wp-content/uploads/SAMSON-POS.jpg)
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