Disclaimer: This guide is for informational purposes and does not replace the official Fisher 3590 instruction manual. Always refer to the original manufacturer documentation (D103172X012) for safety warnings, hazardous area classifications, and detailed procedures.
The Fisher Type 3590 series (including S and ST variants) consists of electro-pneumatic valve positioners that are now classified as obsolete/discontinued by Emerson. They were designed to convert a DC input signal (typically 4–20 mA) into a proportional pneumatic output pressure to precisely position a control valve stem. Technical Specifications fisher 3590 valve positioner manual
Supply Pressure: Typically 5 PSIG higher than the upper range limit of the input signal, with a maximum of approximately 50 PSI. Disclaimer: This guide is for informational purposes and
. Manuals for these discontinued models are generally provided through archival files rather than current catalogs. Manual & Technical Resources Instruction Manual (Archived) User Manual : A basic manual that provides
Calibration typically follows a "Force-Balance" principle common to analog Fisher positioners:
Since this is an obsolete product, you may find the full instruction manuals on third-party technical libraries or specialized surplus sites:
directly, as they maintain the "Fishweb" database for obsolete product manuals Key Specifications (3590 / 3590ST)