Fisher 3590 Valve Positioner Manual

Periodically check that the positioner casing vent screens are clear of debris, insects, or ice.

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50 PSI maximum; should be 5 PSIG higher than the upper range limit of the input signal. Temperature Limits: -40°F to 150°F (-40°C to 66°C). Action: Direct or reverse acting. ⚠️ Safety Precautions Periodically check that the positioner casing vent screens

Unscrew the bellows posts, invert the bellows, and adjust the bias spring to ensure the correct starting point of the piston travel. Document Change: Note the action change on the label. 3.3 Zero and Span Adjustment invert the bellows