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Instruction Manual
June 2008
MINOR LOOP
GAIN ADJ
FLAPPER
NOZZLE
FIXED
RESTRICTION
equipment into the surrounding
atmosphere. Personal injury or
property damage may result from fire
or explosion if preventative measures
are not taken, such as adequate
ventilation and the removal of any
ignition sources.
D Use bypass valves or completely
shut off the process to isolate the
valve from process pressure.
D Vent the actuator loading
pressure and disconnect positioner
supply pressure.
CROSS-OVER ADJ
RELAY
A
ZERO ADJ
SUMMING BEAM
CAVITY A
CAVITY B
MAGNET
COIL 4 TO
FIXED
SUPPLY
20 mA INPUT
RESTRICTION
38A6593-A
END VIEW OF
B2150 / IL
ROTARY SHAFT
Figure 22. Schematic of the 3620J Positioner
3610J and 3620J Positioners
RELAY BEAM
RELAY
B
RANGE SPRING
COARSE
SPAN
ADJ
COUNTER SPRING
PIVOT A
INPUT MODULE
SPRING AND DIAPHRAGM
ACTUATOR
FLAPPER
POSITIONER CAM
NOZZLE
D For explosion proof applications,
disconnect power before removing the
converter housing cap in an explosive
atmosphere.
D Use lock-out procedures to be
sure that the above measures stay in
effect while you work on the
equipment.
D Check with your process of safety
engineer for any additional measures
that must be taken to protect against
process media.
SUPPLY PRESSURE
NOZZLE PRESSURE
INPUT SIGNAL
OUTPUT SIGNAL
AIR
SUPPLY
FINE
SPAN
ADJ
PIVOT
B
FEEDBACK
LEVER
29
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