Fisher 3590 Valve Positioner Manual -

Calibration adjusts the zero and span of the positioner to match the actuator's range. A. Zero Adjustment Apply the lowest input signal (4 mA or 0% travel).

Turn the span adjustment screw until the valve stem reaches its exact maximum travel destination. fisher 3590 valve positioner manual

Check for supply air pressure, input 4-20 mA signal, or clogged pilot relay. Calibration adjusts the zero and span of the

Connect the "Output" port to the actuator diaphragm casing or piston cylinder. input 4-20 mA signal