Turn the zero adjustment screw until the valve just begins to move from its seat. 2. Span Adjustment Apply the high-end signal (e.g., 20mA or 15 psi).
Adjust the span ratio arm or screw until the valve reaches its full rated travel. 3. Iteration Zero and span adjustments are interactive. fisher 3590 valve positioner manual
Repeat the steps until both the 0% and 100% points are accurate. Maintenance and Troubleshooting Turn the zero adjustment screw until the valve
Connects the valve stem to the positioner. Relay: Amplifies the air signal to move the actuator. Installation Procedures fisher 3590 valve positioner manual