The Fisher 3582i Electro-Pneumatic Positioner is designed to accurately control the position of a control valve stem in response to a 4–20 mA DC electrical input signal. It consists of a Fisher 3582 pneumatic valve positioner integrated with a 582i electro-pneumatic converter, which converts the electrical signal into a proportional pneumatic signal to operate the valve actuator. The device offers fast response, low steady-state air consumption, and flexible zero and span adjustments. It is suitable for industrial process control applications requiring precise and reliable control valve positioning.