The heart of the pneumatic amplification.
The 3590 series typically includes the standard , 3590S , and 3590ST models. Input Signal: 4 to 20 mA DC. Internal Resistance: Approximately 300 Ohms. Supply Pressure: Maximum 50 psig. fisher 3590 valve positioner manual
Proper mechanical mounting is critical. Incorrect installation is the #1 cause of instability. The heart of the pneumatic amplification