The Fisher Type 3590 is an electro-pneumatic (I/P) valve positioner typically used to convert a milliampere (mA) DC input signal into a proportional pneumatic output pressure to position a control valve.
The Fisher 3590 (including S and ST variants) is a legacy electro-pneumatic valve positioner series widely regarded for its ruggedness and reliability in harsh industrial environments. While Emerson officially classifies the 3590 as an obsolete product, it remains a staple in secondary markets due to its straightforward mechanical design and high compatibility with existing Fisher control technology. Performance Review fisher 3590 valve positioner manual
Types of Manuals
Pneumatic Connections: Connect the supply air (typically 20 to 100 psi depending on the model) to the "Supply" port. Connect the "Output" port to the actuator diaphragm. The Fisher Type 3590 is an electro-pneumatic (I/P)