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3710 and 3720 Positioners
OUTPUT CONNECTIONS
34B0693-A
B2386-1/IL
WARNING
Types 3720 and 3722 are not approved
for use with flammable or hazardous
gas as the supply pressure medium.
Personal injury or property damage
could result from fire or explosion if
flammable or hazardous gas is used as
the supply pressure medium.
16
TOP VIEW
INPUT
CONNECTIONS
RIGHT SIDE VIEW
VENT
OPENING
REAR VIEW
TYPE 3710
Figure 12. Connections
M20 CABLE
GLAND
RIGHT SIDE VIEW
TYPE 3720
See figure 13.
The positioner does not have an external vent
connection. A unit exhausts actuator pressure
through a screened hole (vent opening, figure 12)
located in the positioner base plate. Do not restrict
the vent opening. Restricting the vent opening can
produce a pressure buildup in the positioner case
and degrade positioner performance.
A purge tube (key 58, figure 13) is available as an
option when mounting the positioner on selected
Fisher actuators. One end of the purge tube with an
O-ring (key 59) installs in the actuator cover plate.
The other end of the purge tube with an O-ring
Instruction Manual
Form 5300
July 2005
INPUT (SUPPLY)
CONNECTION
VENT
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