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3710 and 3720 Positioners
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 or safety
engineer for any additional measures
that must be taken to protect against
process media.
WARNING
The positioner can provide full supply
pressure to any connected equipment.
To avoid personal injury and
equipment damage, make sure supply
pressure never exceeds the maximum
safe working pressure of any
connected equipment.
See figure 3.
To change an existing Type 3710 positioner into a
Type 3720 positioner, install a Type 3722
electro-pneumatic converter. The Type 3722
electro-pneumatic converter mounts over the input
and supply connections of the Type 3710 positioner.
1. Be sure all safety procedures have been
followed. Remove the input and supply connections
from the existing Type 3710 base plate and clean
the ports.
2. Locate the two O-rings (key 85, figure 32) and
properly lubricate (key 82) them. Place one O-ring in
the recessed area surrounding the input port on the
positioner base plate. Place the other O-ring around
the supply port.
3. Locate the two socket head mounting screws
(key 84). Properly orient the converter and secure it
to the positioner base plate with the mounting
screws. Be sure the O-rings remain in place while
securing the converter to the positioner base plate.
4. Connect supply pressure to the converter supply
port.
8
Mounting the Positioner
WARNING
Refer to the Installation WARNING at
the beginning of the Installing the
Type 3722 Converter section of this
manual.
Typically, a positioner is ordered with an actuator. At
the factory, the positioner is mounted on the actuator
and calibrated. However, a positioner can be
ordered separately and mounted on an existing
actuator.
To field-mount a positioner to an existing actuator,
an actuator cover plate with mounting holes and
purge tube knockout may be required. Check the
existing actuator cover plate. It must have three
positioner mounting holes and, for specific actuators,
a purge tube knockout. See table 4.
If the proper mounting holes are present, perform
the following mounting procedure and then follow the
calibration procedures in this instruction manual.
Refer to the appropriate instruction manuals for
actuator and valve mounting procedures.
The positioner mounts directly to the
actuator cover plate of several Fisher
actuators. See table 4. To directly
mount the positioner to an existing
Fisher actuator, you must use an
actuator cover plate with three
positioner mounting holes and the
5/8-inch purge option knockout plug.
See the parts list for the specific
actuator cover plate required above to
integrally mount the positioner.
See figures 4 and 33 for positioner
mounting drawings.
To mount the positioner to an actuator
with an existing Type 3610 positioner,
remove the Type 3610 positioner and
replace it with an appropriate metal
cover plate and four cap screws. For
assistance, contact your Fisher sales
office.
1. See figure 5 for a typical actuator. Remove the
actuator travel indicator machine screws, travel
indicator, and actuator cover cap screws.
Instruction Manual
Form 5300
July 2005
Note
Note
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