Instruction Manual
D200138X012
3582, 582i, and 3583
January 2013
33
Figure 17. Schematic Illustration of Fisher 3582 Positioner
22A7965‐A
A2453‐2
OUTPUT TO
ACTUATOR
RELAY
INSTRUMENT INPUT
BELLOWS
SUPPLY
FEEDBACK AXIS
PIVOT
NOZZLE
FLAPPER ASSEMBLY
DIRECT ACTING
QUADRANT
INPUT AXIS
CAM
REVERSE ACTING
QUADRANT
BEAM
TRAVEL PIN
ROTARY SHAFT ARM
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
A4818‐2
582i
CONVERTER
PIVOT
CAM
INPUT AXIS
BEAM
BELLOWS
FEEDBACK AXIS
DIRECT ACTING
QUADRANT
PNEUMATIC SIGNAL FROM CONVERTER
NOZZLE
SUPPLY
OUTPUT TO ACTUATOR
ROTARY
SHAFT ARM
RELAY
FLAPPER ASSEMBLY
REVERSE ACTING
QUADRANT
4‐20 MILLIAMPERE—
INPUT SIGNAL
)