Fisher 3590 Valve Positioner Manual Jun 2026

The Fisher Type 3590 series (including 3590S and 3590ST) electro-pneumatic positioners are designed for high-performance, precision control of pneumatic valve actuators. By acting as a feedback controller between the control signal and the valve actuator, the 3590 ensures accurate valve stem positioning, correcting errors caused by process friction, actuator diaphragm pressure changes, or other disturbances.

: Connect the positive signal to the leftmost terminal and the negative signal to the adjacent terminal labeled EP. Air Supply : A filter-regulator, such as the Fisher 67CFR Go to product viewer dialog for this item. , is recommended to provide clean, dry air. 3. Calibration Procedure (Zero and Span) fisher 3590 valve positioner manual

The Fisher 3590 manual is a masterclass in applied pneumatic control. Its strength is in the details: cam selection, range spring matching, and the flapper-nozzle gap. For a technician, the manual’s warnings about air quality, feedback arm travel, and supply pressure differentials are not optional—they are the difference between a positioner that lasts 10 years and one that fails in 10 weeks. Any maintenance team using the 3590 should keep a physical copy of manual D103172X012 in the shop, not just a PDF on a phone. The Fisher Type 3590 series (including 3590S and

: For the 3590’s analog design, calibration is typically a mechanical process of adjusting zero and span. Apply a 4 mA (or 0%) signal. Adjust the zero screw until the valve is at its fully closed position. Then, apply a 20 mA (or 100%) signal and adjust the span until the valve reaches its fully open position. You may need to repeat this process several times to achieve a stable calibration. Air Supply : A filter-regulator, such as the