Data Sheet

3610J and 3620J Positioners
D200064X012
Product Bulletin
62.1:3610
February 2015
5
Figure 1. Typical Fisher 3610J and 3620J Positioner
Mounting
ACTUATOR ROD
CAM
FEEDBACK
LEVER
W3783
Features
n Accurate, Efficient, Vibration-Resistant
Operation—The positioner provides accurate,
fast-response and can withstand the vibrations of
most plant environments. Low steady-state air
consumption contributes to efficient operation.
n Modular Design— The pneumatic 3610J positioner
easily converts to an electro-pneumatic 3620J
positioner by replacing the existing gauge block
with the 3622 electro-pneumatic converter
assembly. The converter assembly attaches to the
existing positioner, providing a simple, compact,
and cost-effective conversion.
n Versatility—3610J and 3610JP positioners accept a
pneumatic input signal and 3620J and 3620JP
positioners accept a DC current input signal from a
control device. The pneumatic and
electro-pneumatic positioners provide split range
capabilities and adjustable zero and span. The
rangeability of the positioner zero and span permits
using a single range spring for all standard input
signals including split ranges.
Figure 2. Adjustments for Fisher 3610J and 3620J
Positioners
ZERO
ADJUSTMENT
W4900-1
COARSE SPAN
ADJUSTMENT
MINOR LOOP
GAIN
ADJUSTMENT
FINE SPAN
ADJUSTMENT
CROSSOVER
ADJUSTMENT
DIRECT/
REVERSE
PLATE
n Fewer Spare Parts—Most of the parts for 3610J and
3610JP or 3620J and 3620JP positioners are
interchangeable, requiring fewer spare parts to
support these positioners.
n Easy Positioner Adjustments—With the cover
removed, zero, span, and cross-over adjustments,
shown in figure 2, are easily accessible and can be
made with a screwdriver.
n Application Flexibility—Easily adjustable minor loop
gain fine tunes the positioner to optimize dynamic
response for each specific actuator size and
application.
n Stable Operation—Changes in supply pressure have
minimal effect on positioner operation.
n Corrosion Resistant—Case, components, and gasket
materials withstand harsh environments. Positioner
bleed air purges internal parts and actuator housing
for additional protection.
n Field Reversible—Simple adjustments permit
switching between direct and reverse action; no
additional parts are required.