Instruction Manual
3582, 582i, and 3583
D200138X012
February 2012
Figure 17. Schematic Illustration of Fisher 3582 Positioner OUTPUT TO ACTUATOR RELAY INSTRUMENT INPUT
BELLOWS SUPPLY
FEEDBACK AXIS PIVOT NOZZLE FLAPPER ASSEMBLY
ROTARY SHAFT ARM
DIRECT ACTING QUADRANT
TRAVEL PIN
INPUT AXIS CAM BEAM
22A7965‐A A2453‐2
REVERSE ACTING QUADRANT
3582i Valve Positioner As shown in figure 18, the 3582i electro‐pneumatic valve positioner has a 582i electro‐pneumatic converter attached to the valve positioner. The 582i contains an I/P module which provides a pneumatic output proportional to a DC current input signal. The DC current input operates coils in a force balanced beam system which in turn, control bleed air through an integral nozzle/flapper arrangement. The nozzle pressure provides the pneumatic input signal pressure used by the pneumatic valve positioner. Figure 18. Schematic Illustration of Fisher 3582i Positioner 4‐20 MILLIAMPERE— INPUT SIGNAL ) PNEUMATIC SIGNAL FROM CONVERTER 582i CONVERTER
BELLOWS FEEDBACK AXIS
SUPPLY
NOZZLE BEAM DIRECT ACTING QUADRANT
OUTPUT TO ACTUATOR RELAY ROTARY SHAFT ARM
INPUT AXIS CAM
PIVOT FLAPPER ASSEMBLY
REVERSE ACTING QUADRANT
A4818‐2
33