Emerson Fisher 3710 User manual

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Types 3710 and 3720 Valve Positioners and
Type 3722 Converter
Contents
Introduction 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scope of Manual 2. . . . . . . . . . . . . . . . . . . . . . . . .
Description 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Positioner to Actuator Mountings List 2. . . . . . .
Educational Services 7. . . . . . . . . . . . . . . . . . . . . .
Specifications 7. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the Type 3722 Converter 7. . . . . . . . . . .
Mounting the Positioner 8. . . . . . . . . . . . . . . . . . . . .
Installing the Type 3710 or 3720
Pneumatic Positioner on Size 25 or 50
Type 585 and 585R Actuators 12. . . . . . . . . .
Connections 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply Connection 15. . . . . . . . . . . . . . . . . . . . . . .
Output Connections 15. . . . . . . . . . . . . . . . . . . . . .
Instrument Connection 15. . . . . . . . . . . . . . . . . . .
Vent Opening, Purge Option, and Actuator
Vent Connection 15. . . . . . . . . . . . . . . . . . . . . .
Connecting the Purge Tube 17. . . . . . . . . . . . . .
Electrical Connection for the Type 3722
Positioner 18. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Connections 20. . . . . . . . . . . . . . . . . .
Calibration 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting the Initial Cam Position 20. . . . . . . . . . . .
Zero and Span Adjustments 21. . . . . . . . . . . . . . .
Standard or Beacon Indicator Alignment 23. . . .
Changing Positioner Action 24. . . . . . . . . . . . . . . .
Single-Action/Double-Action 24. . . . . . . . . . . . . .
Direct-Action/Reverse-Action 24. . . . . . . . . . . . . .
Split-Range Operation 25. . . . . . . . . . . . . . . . . . . .
Changing the Spool Valve (To Increase
Positioner Output Capacity) 25. . . . . . . . . . . . .
Changing the Span Adjuster Assembly (To
Change Positioner Input Range) 26. . . . . . . .
Principle of Operation 27. . . . . . . . . . . . . . . . . . . . .
Maintenance 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Positioner Maintenance 28. . . . . . . . . . . . . . . . . .
Replacing the Standard or Beacon Indicator 28
Removing the Type 3722 Converter 28. . . . . .
Removing the Positioner 30. . . . . . . . . . . . . . . .
Removing the Feedback Arm Assembly 30. . .
Disassembling the Feedback Arm Assembly
and Span Adjuster Assembly 31. . . . . . . . . .
Removing the Feedback Shaft (Cam Shaft) 31
W6144/IL
W6058-1/IL
SUPPLY
CONNECTION
TYPE 3720 POSITIONER MOUNTED ON
A TYPE 1052 ACTUATOR
TYPE 3710 POSITIONER MOUNTED ON
A TYPE 1066 ACTUATOR
Figure 1. Positioners
Instruction Manual
Form 5300
July 2005 3710 and 3720 Positioners

3710 and 3720 Positioners Instruction Manual
Form 5300
July 2005
2
Contents (cont’d)
Disassembling the Spool Valve, Action Block,
and Gasket 33. . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembling the Input Module and
Summing Beam Assembly 33. . . . . . . . . . . .
Replacing the Input Module Diaphragm 34. . .
Assembling the Input Module and Summing
Beam Assembly 35. . . . . . . . . . . . . . . . . . . . .
Assembling the Spool Valve, Action Block,
and Gasket 36. . . . . . . . . . . . . . . . . . . . . . . . . .
Assembling the Feedback Shaft (Cam Shaft)36
Replacing the Feedback Arm Assembly
and Span Adjuster Assembly 36. . . . . . . . . .
Type 3722 Converter Maintenance 37. . . . . . . . .
Replacing the Converter Primary O-Ring
and Filter 37. . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembling the Type 3722 Converter 37. .
Assembling the Type 3722 Converter 37. . . . .
Testing the Type 3722 Converter Module 38. .
Parts Ordering 38. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Kits 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts List 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Positioner Common Parts 39. . . . . . . . . . . . . . . . . .
Diagnostic Connections 43. . . . . . . . . . . . . . . . . . . .
Type 3722 Electro-Pneumatic Converter 43. . . . .
Positioner Mounting Parts 44. . . . . . . . . . . . . . . . . .
Mounting Parts for Mounting Positioner on Type
585 and 585R Actuators 48. . . . . . . . . . . . . . . . .
Mounting Parts for the 67CFR on the Type 1032
Actuator 48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fittings 48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loop Schematics/Nameplates 49. . . . . . . . . . . . . .
Introduction
Scope of Manual
This instruction manual includes installation,
operation, calibration, maintenance, and parts
ordering information for the Type 3710 pneumatic
positioner and Type 3720 electro-pneumatic
positioner. This manual also provides field
installation and maintenance information for the
Type 3722 electro-pneumatic converter. Refer to
separate instruction manuals for information on the
actuator, control valve, and other accessories.
No person may install, operate, or maintain a Type
3710 pneumatic positioner, a Type 3720
electro-pneumatic positioner or a Type 3722
electro-pneumatic converter without first Dbeing fully
trained and qualified in valve, actuator and
accessory installation, operation and maintenance,
and Dcarefully reading and understanding the
contents of this manual. If you have any questions
about these instructions, contact your FisherRsales
office.
Description
The Type 3710 pneumatic positioner and the Type
3720 electro-pneumatic positioner are used with
either diaphragm actuators (spring return) or piston
rotary actuators (spring return or double-action) as
shown in figure 1. These positioners provide a valve
ball or disk position for a specific input signal. These
positioners can easily be configured to provide
single- or double-action output for rotary actuators.
The Type 3710 pneumatic positioner accepts a
pneumatic input signal. The Type 3720
electro-pneumatic positioner accepts a milliampere
(mA), direct current (dc), input signal. Refer to table
1 for an explanation of type numbers.
The Type 3710 pneumatic positioner provides a
valve position for a standard pneumatic input signal.
The positioner may also be split-ranged. See table 3
for input signal ranges.
The Type 3720 electro-pneumatic positioner
provides a valve position for a milliampere (mA),
direct current (dc), input signal. The positioner may
also be split-ranged. See table 3.
Positioner to Actuator Mountings List
The positioner mounts directly to the actuator cover
plate of Types 1051, 1052, and 1061 actuators. See
table 4 for actuator sizes.
Figure 2 shows a positioner ready for mounting on a
piston rotary actuator. A mounting plate (key 43) is
used to mount the positioner base plate to Types
1031, 1032, 1051, 1052, 1061, and 1062 actuators.
See table 4 for actuator sizes.
The positioner also mounts on a size 25 or 50 Type
585 and 585R sliding-stem actuator. A mounting
plate (key 43) is used to mount the positioner base
plate to the actuator.

3710 and 3720 Positioners
Instruction Manual
Form 5300
July 2005
3
Table 1. Specifications
Available Configurations
Type 3710: JSingle- or Jdouble-acting
pneumatic rotary valve positioner
Type 3720: JSingle- or Jdouble-acting
electro-pneumatic rotary valve positioner
consisting of a Type 3710 with a Type 3722
attached
Type 3722: An electro-pneumatic converter that
converts a 4 to 20 mA dc input signal to a 0.2 to
1.0 bar (3 to 15 psig) signal for the pneumatic
positioner
Input Signal(1)
Type 3710:
Standard: J0.2 to 1.0 bar (3 to 15 psig)or J0.4
to 2.0 bar (6 to 30 psig)
Split-Range: J0.2 to 0.6 bar (3 to 9 psig) and 0.6
to 1.0 bar (9 to 15 psig) or J0.4 to 1.2 bar (6 to
18 psig) and 1.2 to 2.0 bar (18 to 30 psig)
Type 3720:
Standard: J4 to 20 mA dc constant current with
30 V dc maximum compliance voltage
Split-Range: J4 to 12 mA dc or 12 to 20 mA dc
Equivalent Circuit
Type 3720: 120 ohms shunted by three 5.6 V
zener diodes. See figure 15.
Output Signal(1)
Pneumatic pressure as required by the actuator
up to full supply pressure
Action(2):Field-reversible between Jdirect and
Jreverse within the pneumatic positioner
Declaration of SEP
Fisher Controls International LLC declares this
product to be in compliance with Article 3
paragraph 3 of the Pressure Equipment Directive
(PED) 97 / 23 / EC. It was designed and
manufactured in accordance with Sound
Engineering Practice (SEP) and cannot bear the
CE marking related to PED compliance.
However, the product may bear the CE marking
to indicate compliance with other applicable EC
Directives.
Supply Pressure(1,5)
Recommended: 0.3 bar (5 psig) above actuator
requirement
Maximum: 10.3 bar (150 psig) or maximum
pressure rating of the actuator, whichever is lower
Type 3720 and 3722 are not approved for use
with a flammable or hazardous supply medium.
Steady-State Air Consumption(3)
Type 3710:
Standard Spool Valve: 0.61 normal m3/hr (23
scfh) at 4.1 bar (60 psig) supply pressure
High-Capacity Spool Valve: 0.75 normal m3/hr
(28 scfh) at 4.1 bar (60 psig) supply pressure
Type 3720:
Standard Spool Valve: 0.80 normal m3/hr (30
scfh) at 4.1 bar (60 psig) supply pressure
High-Capacity Spool Valve: 0.93 normal m3/hr
(35 scfh) at 4.1 bar 60 psig supply pressure
Maximum Supply Air Demand(3) (Double Acting
Output)
Standard Spool Valve: 4.1 bar (60 psig) supply,
13 normal m3/hr (480 scfh)
High-Capacity Spool Valve: 4.1 bar (60 psig)
supply, 23 normal m3/hr (860 scfh)
Typical Performance(1,4)
Type 3710 Pneumatic Positioner
Independent Linearity: ±0.5% of output span
Hysteresis: 0.5% of output span
Deadband: 0.3% of input span
Type 3720 Electro-Pneumatic Positioner
Independent Linearity: ±1.0% of output span
Hysteresis: 0.6% of output span
Deadband: 0.35% of input span
Electromagnetic Interference (EMI)(1)
(Type 3722): Tested per IEC 61326-1 (Edition
1.1). Conforms to the European EMC Directive.
Meets emission limits for class A equipment
(industrial locations) and class B equipment
(domestic locations). Meets immunity
requirements for industrial locations (Table A.1 in
the IEC specification document). Immunity
performance is shown in table 2.
- Continued -

3710 and 3720 Positioners Instruction Manual
Form 5300
July 2005
4
Table 1. Specifications (Continued)
Operating Influences(1)
Supply Pressure Sensitivity: A 10% change in
supply pressure changes the valve shaft position
less than the following percentages of valve
rotation:
Type 3710: 1.0% at 4.1 bar (60 psig) supply
pressure
Type 3720: 1.5% at 4.1 bar (60 psig) supply
pressure
Operative Temperature Limits(1,5)
J−40 to 80_C (−40 to 180_F), J−50 to 80_C
(−58 to 180_F) or J0 to 107_C (32 to 225_F)
(Type 3710 only)
Hazardous Area Classification for Type 3710
Type 3710 pneumatic positioners comply with the
requirements of ATEX Group II Category 2 Gas
and Dust
Housing Classification for Type 3722 Converter
NEMA 3 (FM), Enclosure 3 (CSA), IP54 per IEC
60529. Mount instrument with vent on side or
bottom if weatherproofing is a concern.
Electrical Classifications for Type 3722
Converter
Intrinsically Safe, Explosion proof,
Dust-Ignition proof,
Intrinsically Safe, Explosion proof,
Dust-Ignition proof, Non-incendive
Intrinsically Safe, Flameproof, Type n
Intrinsically Safe, Flameproof, Type n
Refer to tables 5 and 6, and figures 34, 35, 36, 37
and 38 and the Hazardous Area Classification
bulletins 9.2:001 series and 9.2:002 for additional
information and/or approvals.
Pressure Connections
1/4-inch NPT female
Conduit Connection for Type 3722 Converter
J1/2-inch NPT female (standard) or
JM20 female (optional)
Rotary Valve Rotation
J90 degrees (standard) J60 degrees (optional)
Approximate Weight
Type 3710: 2.04 kg (4.5 pounds)
Type 3720: 2.72 kg (6.0 pounds)
1. This term is defined in ISA Standard S51.1.
2. For direct action, an increasing input signal extends actuator rod. For reverse action, an increasing input signal retracts actuator rod.
3. Normal cubic meters per hour (0°C and 1.01325 bar absolute). Scfh — standard cubic feet per hour (60°F and 14.7 psia).
4. Typical valves tested using a Fisher Type 1061 size 30 actuator at 4.1 bar (60 psig) supply pressure. Performance may vary with other actuator types and supply pressures.
5. The pressure and temperature limits in the document, and any applicable code or standard limitation should not be exceeded.
Table 2. EMC Immunity Performance Criteria
Port Phenomenon Basic Standard Test Level Performance
Criteria(1)
Electrostatic Discharge (ESD) IEC 61000-4-2 4 KV contact 8 KV air A
Enclosure Radiated EM field IEC 61000-4-3 80 to 1000 MHz, 10 V/m 1 KHz AM at 80% A
Enclosure
Rated power frequency magnetic field IEC 61000-4-8 60 A/m at 50 Hz A
Burst (fast transients) IEC 61000-4-4 1 KV A
I/O signal/control Surge IEC 61000-4-5 1 KV (line to ground only) B
I/O signal/control
Conducted RF IEC 61000-4-6 150 kHz to 80 MHz at 3 volts A
Specification limit = ±1% of span
1. A = No degradation during testing. B = Temporary degradation during testing, but is self-recovering.
APPROVED
SAA
ATEX

3710 and 3720 Positioners
Instruction Manual
Form 5300
July 2005
5
W6059-1*/IL
MOUNTING
SCREW
FEEDBACK
SHAFT
MOUNTING
SCREWS
TIE BAR
EXTENSION
(KEY 44) POSITIONER
MOUNTING
PLATE (KEY 43)
Figure 2. Mounting the Positioner Base Plate
Table 3. Input Signal Range
POSITIONER TYPE
INPUT SIGNAL RANGE
POSITIONER TYPE
Pneumatic Electronic
Type 3710
w/3 to 15 psig span adj. ass’y
(no color coding)
J0.2 - 1.0 bar (3 - 15 psig)
J0.2 - 0.6 bar (3 - 9 psig) and
0.6 - 1.0 bar (9 - 15 psig), split-ranging –––
Type 3710
w/6 to 30 psig span adj. ass’y
(red color coding)
J0.4 - 2.0 bar (6 - 30 psig)
J0.4 - 1.2 bar (6 to 18 psig) and
1.2 - 2.0 bar (18 - 30 psig), split-ranging –––
Type 3720 ––– J4 - 20 mA, dc
J4 - 12 mA, dc, or 12 - 20 mA, dc, split-ranging
Table 4. Positioner to Actuator Mountings
POSITIONER TO ACTUATOR MOUNTINGS
Direct Mounting to Actuator Cover Plate(1) Mounting Plate Required
SType 1051, sizes 30(2), 40, and 60
SType 1052, sizes 30(2), 40, 60, and 70
SType 1061, sizes 30, 40, 60, and 68
SType 1031, sizes 26, 33, 45, 60, and 80
SType 1032, sizes 45, 70, 185, 280, 425, 680, 1125, 1370, 2585, and 4580
SType 1051, size 33
SType 1052, sizes 20, 33
SType 1061, sizes 80, 100
SType 1066, sizes 20, 27, and 75
1. Includes purge tube option.
2. The size 30 actuator is no longer manufactured by Fisher. The Types 3710, 3720 positioners are available for field installation on existing size 30 actuators.

3710 and 3720 Positioners Instruction Manual
Form 5300
July 2005
6
Table 5. Type 3722—Hazardous Area Classifications for North America
CERTIFICATION
BODY CERTIFICATION OBTAINED ENTITY RATING TEMPERATURE CODE ENCLOSURE RATING
(Intrinsic Safety)
Class/Division
SClass I,II,III Division 1 GP A,B,C,D,E,F,G
per drawing 24B0238
− − − T5 (Tamb t82°C) 3
CSA (Explosion Proof)
Class/Division
SClass I, Division 1 GP A,B,C,D − − − T5 (Tamb t82°C) 3
Class I Division 2 GP A,B,C,D
Class II Division 1 GP E,F,G
Class II Division 2 GP F,G − − − T5 (Tamb t82°C) 3
(Intrinsic Safety)
Class/Division
SClass I,II,III Division 1 GP A,B,C,D,E,F,G
per drawing 24B0239
Vmax = 40 Vdc
Imax = 200 mA
Ci= 0 nF
Li= 0 mH T5 (Tamb t82°C) 3
FM (Explosion Proof)
Class/Division
SClass I, Division 1 GP A,B,C,D − − − T5 (Tamb t82°C) 3
Class I Division 2 GP A,B,C,D
Class II Division 1 GP E,F,G
Class II Division 2 GP F,G − − − T5 (Tamb t82°C) 3
Table 6. Type 3722—Hazardous Area Classifications for Europe and Asia-Pacific
CERTIFICATION
BODY CERTIFICATION OBTAINED ENTITY RATING TEMPERATURE CODE ENCLOSURE RATING
(Intrinsic Safety)
II 1 G
Gas
SEEx ia IIC T4/T5/T6
Ui= 30 Vdc
Ii= 150 mA
Pi= 1.25 W
Ci= 0 nF
Li= 0 mH
T4 (Tamb t82°C)
T5 (Tamb t62°C)
T6 (Tamb t47°C) IP54
ATEX
(LCIE)
(Flameproof)
II 2 G
Gas
SEEx d IIB T5/T6
− − − T5 (Tamb t82°C)
T6 (Tamb t74°C) IP54
(Type n)
II 3 G
Gas
SEEx nA IIC T6
− − − T6 (Tamb t82°C) IP54
(Intrinsic Safety)
Gas
SEx ia IIC T4
Ui= 32 Vdc
Ii= 150 mA
Ci= 0 nF
Li= 0 mH T4 (Tamb t40°C) IP54
SAA (Flameproof)
Gas
SEx d IIB T6 − − − T6 (Tamb t40°C) IP54
(Type n)
Gas
SEx n IIC T4 − − − T4 (Tamb t40°C) IP54

3710 and 3720 Positioners
Instruction Manual
Form 5300
July 2005
7
W6145/IL
EXTERNAL
GROUNDING
SCREW
SUPPLY
CONNECTION
1/2-NPT OR M20
CONDUIT CONNECTION
Figure 3. Type 3722 Electro-Pneumatic Converter
Educational Services
For information on available courses for Type 3710
pneumatic positioners or Type 3720
electro-pneumatics positioners, as well as a variety
of other products, contact:
Emerson Process Management
Educational Services, Registration
P.O. Box 190; 301 S. 1st Ave.
Marshalltown, IA 50158−2823
Phone: 800−338−8158 or
Phone: 641−754−3771
FAX: 641−754−3431
e-mail: [email protected]
Specifications
Specifications are shown in table 1.
Note
Neither EmersonR, Emerson Process
Management, Fisher, nor any of their
affiliated entities assumes
responsibility for the selection, use,
and maintenance of any product.
Responsibility for the selection, use,
and maintenance of any product
remains with the purchaser and
end-user.
Installing the Type 3722 Converter
WARNING
Avoid personal injury from sudden
release of process pressure. Before
mounting the Type 3720 electro-
pneumatic positioner or Type 3722
electro-pneumatic converter:
DWear protective eyewear, gloves
and clothing whenever possible.
DDisconnect any operating lines
providing air pressure, electric power,
or a control signal to the actuator. Be
sure the actuator cannot suddenly
open or close the valve.
DUse bypass valves or completely
shut off the process to isolate the
valve from process pressure.
DRelieve any supply or output
pressure in the existing positioner.
DWhen installing an electro-
pneumatic positioner or converter in a
hazardous area, turn off control
signals until installation is complete.
Be sure all safety barriers,
connections, and the converter
housing cap and O-ring are properly
installed before supplying a control
signal to the unit.

3710 and 3720 Positioners Instruction Manual
Form 5300
July 2005
8
DUse lock-out procedures to be
sure that the above measures stay in
effect while you work on the
equipment.
DCheck 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.
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.
Note
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.
Note
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.

3710 and 3720 Positioners
Instruction Manual
Form 5300
July 2005
9
42B8466-A/DOC
42B8466-A/DOC
TYPE 3710 POSITIONER MOUNTED ON A
TYPE 1061 SIZE 30 ACTUATOR
TYPE 3720 POSITIONER MOUNTED ON A
TYPE 1061 SIZE 30 ACTUATOR
NOTES:
FIGURE 33 SHOWS ADDITIONAL POSITIONER/ACTUATOR COMBINATIONS
ACTUATOR COVER PLATE REQUIRED WHEN REPLACING AN INSTALLED TYPE 3610 POSITIONER
1
Figure 4. Typical Positioner/Actuator Combinations

3710 and 3720 Positioners Instruction Manual
Form 5300
July 2005
10
W6147-1/IL
W6146-1/IL
REAR VIEW, POSITIONER BASE PLATE, AND MOUNTING AREA
TIE BAR, MOUNTING PLATE REMOVED
Figure 5. Typical Piston Actuator (Type 1061)

3710 and 3720 Positioners
Instruction Manual
Form 5300
July 2005
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W5916/IL
Figure 6. Loosening the Cam Locknut
Note
When removing the actuator cover
plate, take care not to change the
position of the rod end bearing on the
end of the turnbuckle inside the
actuator housing.
2. If necessary, install a new cover plate.
a. Remove the existing cap screws and actuator
cover plate from the actuator housing.
b. Remove the retaining ring (e-clip) and hub
from the cover plate.
c. Install the hub and retaining ring into the new
actuator/positioner cover plate.
Note
Position the actuator cover plate so
the positioner mounting holes on the
new cover plate allow placement of the
positioner in the desired orientation.
Actuator cover alignment on the Type
1052 actuator can be aided by moving
the actuator slightly away from its
“up” travel stop using a regulated air
source. If the hole alignment cannot be
obtained in this manner, temporarily
loosen the cap screws that secure the
housing to the mounting yoke and
shift the housing slightly. Do not
completely travel the actuator while
the cover is removed.
Tighten the actuator cap screws before
continuing.
3. Position the new actuator/positioner cover plate
so the positioner mounting holes on the new cover
plate allow placement of the new positioner in the
desired orientation. Secure the new cover plate to
the actuator.
4. Install the positioner tie bar (key 42) in place of
the travel indicator on the actuator hub.
Note
Before installation of the positioner
mounting plate (key 43), review the

3710 and 3720 Positioners Instruction Manual
Form 5300
July 2005
12
mounting drawings (figures 4, 33).
Properly align the positioner mounting
plate before attaching the mounting
plate to the actuator cover plate. Note
that the three positioner mounting
holes must be aligned to match the
three mounting screws which will pass
through the base of the positioner.
5. If the specific actuator requires a positioner
mounting plate (key 43), install the mounting plate
using the cap screws (key 45).
6. Unscrew the four captive cover screws and
remove the cover assembly (key 7) from the
positioner.
7. See figure 6. Loosen the cam locknut (key 37)
and rotate the feedback shaft (key 38) as necessary
to align the slot in the feedback shaft end with the tie
bar on the actuator hub. Tighten the cam locknut.
8. Align the positioner with the mounting holes in the
new actuator cover plate or positioner mounting
plate. Be sure that the tie bar fits securely into the
feedback shaft end slot. Secure the positioner to the
actuator cover plate or mounting plate using the
(hex) socket head cap screws (key 46).
9. Before installing the positioner cover, properly
align the valve position indicator (standard,
low-profile indicator or optional beacon indicator).
Follow the standard or beacon indicator alignment
procedure given in this instruction manual. Then,
install the positioner cover assembly.
Installing the Type 3710 or 3720
Pneumatic Positioner on Size 25 or 50
Type 585 and 585R Actuators
WARNING
Refer to the Installation WARNING at
the beginning of the Installing the
Type 3722 Converter section of this
manual.
Refer to figures 7, 8, and 9 for key number locations
unless noted otherwise.
1. An actuator stem bracket is supplied with the
positioner. Assemble the various positioner feedback
parts to the stem bracket as follows:
a. Refer to figure 8. Install the roller bearing (key
101) on the drive stud (key 95) and secure with
the E-ring (key 102).
b. Refer to figure 9. Attach the drive stud (with
roller bearing) to the drive stud bracket (key 98)
with 1/4-inch hex nut (key 96), lock washer (key
100), and flat washer (key 103). Place the flat
washer between the lock washer and the hex nut.
The washers and hex nut should all be on the
same side of the drive stud bracket as shown in
figure 9. The flat washer may be moved to the
other side of the drive stud (between the drive
stud and the drive stud bracket) if extra space is
required to position the roller bearing near the
center of the feedback lever. Leave the hex nut
loose for later adjustment.
c. Attach the drive stud bracket (with drive stud)
to the actuator stem bracket using two cap
screws (key 99), two lock washers (key 100), and
two hex nuts (key 96). Leave the hex nuts loose
for later adjustment.
2. Stroke the actuator from the top stop to the
bottom stop, and record the travel.
In steps 3 through 6, refer to the actuator instruction
manual for key number locations unless noted
otherwise.
3. Loosen eight screws, and remove the front and
back yoke covers (keys 18 and 20).
4. Loosen the two cap screws in the stem connector
assembly (key 15) and remove the stem connector.
Separate the actuator piston stem (key 12) from the
valve plug stem.
Note
Before performing the next step,
position the valve plug stem at the
lower end of its travel. Position the
actuator stem at the upper travel stop.
Check for sufficient clearance between
the actuator stem and the valve stem
to allow removing the stem bracket
assembly. If there is insufficient
clearance, remove the actuator from
the valve.
5. Loosen the stem bracket retainer (key 14) and let
it slide down over the valve plug stem. Remove the
stem bracket assembly (key 13).
6. Install the stem bracket assembly (with drive stud
and drive stud bracket) on the actuator stem. Align
the stem bracket assembly so that it will be parallel
with the back yoke cover. Install the stem bracket
retainer and tighten to 68 NSm (50 lbfSft). If the
actuator was removed from the valve, install the
actuator on the valve. Do not attach the stem
connector at this time.

3710 and 3720 Positioners
Instruction Manual
Form 5300
July 2005
13
CAP SCREW
(KEY 99)
LOCK WASHER
(KEY 100)
HEX NUT
(KEY 96)
SPACER
(KEY 61)
MOUNTING PLATE
(KEY 43)
DRIVE STUD BRACKET
(KEY 98)
CAP SCREW
(KEY 93)
MOUNTING BEARING
(KEY 97)
CAP SCREW
(KEY 46)
CAP SCREW
KEY 45
LOCK
WASHER
(KEY 92)
Figure 7. Typical Type 3710 Positioner Mounted on a Type 585 Actuator
7. Attach the mounting bearing (key 97) to the
mounting plate (key 43) with three hex socket cap
screws (key 93).
8. Refer to the actuator instruction manual. Loosen
the four screws, and remove the actuator blanking
plate.
9. Attach the positioner mounting plate to the
actuator yoke as shown in figure 10 with four
spacers (keys 61), four cap screws (key 45) and lock
washers (key 92).
10. Loosen the four captive cover screws and
remove the positioner cover.
11. Loosen the cam locknut (key 37, figure 31).
12. Attach the positioner to the mounting plate with
three hex socket cap screws (key 46). Make sure
that the positioner feedback shaft (key 38, figure 31)
rotates freely and is not binding with the mounting
bearing, adjust if necessary.
13. Attach the feedback lever (key 94) to the end of
the feedback shaft with the two hex socket cap
screws (key 93). The markings on the feedback
lever should be visible when looking toward the back
of the positioner. Make sure the roller bearing (key
DRIVE STUD
(KEY 95)
ROLLER BEARING
(KEY 101) E-RING
(KEY 102)
Figure 8. Drive Stud and Roller Bearing Assembly
101) on the drive stud engages the slot in the
feedback lever.
WARNING
An unexpected change in actuator
supply pressure while performing the
following steps could result in
personal injury. Use lockout
procedures to ensure a stable air
supply.

3710 and 3720 Positioners Instruction Manual
Form 5300
July 2005
14
FLAT WASHER
(KEY 1103)
HEX NUT
(KEY 96)
LOCK
WASHER
(KEY 100)
DRIVE STUD
AND ROLLER BEARING
DRIVE STUD BRACKET
(KEY 98)
Figure 9. Drive Stud Bracket with Drive Stud
and Roller Bearing Assembly
W8461
Figure 10. Mounting Plate Positioned on Actuator
14. Perform the Actuator Mounting procedure steps
2 through 8 in the actuator instruction manual to
reconnect the actuator stem and valve stem.
15. Make sure the cam locknut (key 37, figure 31) is
loose, then stroke the valve/actuator to mid-travel.
Adjust the drive stud location vertically so that the
feedback lever is perpendicular to the stem. Tighten
the hex nut attached to the drive stud.
16. Refer to figure 11. Adjust the position of the
drive stud bracket so that the center of the roller
bearing aligns with the appropriate travel mark on
the feedback lever.
FEEDBACK LEVER
(KEY 94)
DRIVE STUD
AND ROLLER BEARING
Figure 11. Positioning Drive Stud in Feedback Lever
17. Tighten the cap screws to secure the drive stud
bracket to the stem bracket. If necessary, readjust
the drive stud position to keep the feedback lever
perpendicular to the stem.
18. Make the output, supply, instrument, and vent
connections as described in the Connection section.
Calibrate the positioner by performing the
procedures in the Calibration section.
19. Replace the actuator front and back yoke
covers. Discard the actuator blanking plate and four
screws.
Connections
WARNING
The positioner is capable of providing
full supply pressure to connected
equipment. To avoid personal injury
and equipment damage, make sure the
supply pressure never exceeds the
maximum safe working pressure of
any connected equipment.
To complete the installation of a positioner, connect
tubing and fittings between the positioner and the
actuator. The fittings, tubing, and mounting parts
required depend on the type number and optional
equipment such as filter, regulator, and bypass
valve.
Positioner pressure and electrical connection
locations are shown in figure 12. All pressure
connections are 1/4-inch NPT female. Use 3/8-inch
tubing or 1/4-inch pipe for all tubing connections.
The conduit connection to the converter is 1/2-inch
NPT female with an M20 connection, optional.

3710 and 3720 Positioners
Instruction Manual
Form 5300
July 2005
15
The positioner does not have a remote vent
connection. Refer to the section on vent opening,
purge option, and actuator vent connection for
instructions about a remote vent connection.
Supply Connection
WARNING
Severe personal injury or property
damage may occur if the instrument
air supply is not clean, dry and oil-free.
While use and regular maintenance of
a filter that removes particles larger
than 40 microns in diameter will
suffice in most applications, check
with a Fisher field office and Industry
Instrument air quality standards for
use with corrosive gas or if you are
unsure about the proper amount or
method of air filtration or filter
maintenance.
See figure 12.
Connect a clean, dry, oil-free, non-corrosive air
source to the supply connection of the positioner.
Recommended supply line size is 3/8-inch tubing or
1/4-inch pipe. Use of an appropriate supply air filter
or filter regulator is recommended. Refer to the
positioner specifications, table 1, for supply pressure
requirements.
Supply pressure must not exceed the following
limits:
DFor the positioner, do not exceed the maximum
pressure rating of 10.3 bar (150 psig).
DFor actuator pressure, refer to the appropriate
actuator instruction manual for maximum allowable
pressures.
DFor the valve body assembly, do not exceed
the maximum allowable torque or thrust of the
specific valve.
Output Connections
See figure 12.
Use 3/8-inch tubing between the actuator and
positioner.
For diaphragm rotary actuators (single-action
output from the positioner): Plug OUTPUT A.
Connect OUTPUT B to the diaphragm casing
connection.
For piston rotary actuators (double-action output
from the positioner): To extend the actuator stem
with increasing instrument input signal, connect
OUTPUT A to the lower actuator cylinder connection
and OUTPUT B to the upper actuator cylinder
connection. To retract the actuator stem with
increasing instrument input signal, connect OUTPUT
A to the upper actuator cylinder connection and
OUTPUT B to the lower actuator cylinder
connection.
Instrument Connection
See figure 12.
Use 3/8-inch tubing to connect the output from the
control device to the INSTRUMENT connection on a
pneumatic positioner. For the electro-pneumatic
positioner, refer to the Electrical Connection section.
Vent Opening, Purge Option, and
Actuator Vent Connection
WARNING
If a flammable or hazardous gas is
used as the supply pressure medium,
personal injury or property damage
could result from fire or explosion of
the accumulated gas. Personal injury
or property damage could also result
from contact with the hazardous gas.
The positioner/actuator assembly does
not form a gas-tight seal and
flammable or hazardous gas could
leak from the assembly. Therefore, if
the assembly is enclosed, install a
remote vent line from the enclosure.
Furthermore, a remote vent pipe from
the enclosure alone cannot be relied
upon to remove all hazardous gas.
Use adequate ventilation and other
necessary safety measures. Vent line
piping should comply with local and
regional codes and should be as short
as possible with adequate inside
diameter and few bends to reduce
case pressure buildup.

3710 and 3720 Positioners Instruction Manual
Form 5300
July 2005
16
34B0693-A
B2386-1/IL
OUTPUT CONNECTIONS
INPUT (SUPPLY)
CONNECTION
VENT
M20 CABLE
GLAND
RIGHT SIDE VIEW
RIGHT SIDE VIEW
TYPE 3720
TOP VIEW
INPUT
CONNECTIONS
VENT
OPENING
REAR VIEW
TYPE 3710
Figure 12. Connections
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.
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

3710 and 3720 Positioners
Instruction Manual
Form 5300
July 2005
17
W6073/IL
PURGE TUBE (KEY 58)
O-RINGS (KEY 59)
LONG-BLADED SCREW
DRIVER THROUGH VENT
Figure 13. Mounting the Positioner Base Plate with Purge Tube
installs in the vent opening in the positioner base
plate. When the purge tube is used, it relays actuator
exhaust pressure from the positioner into the
actuator housing.
Within the actuator and positioner assembly,
exhaust pressure takes the following course:
DThe actuator exhaust pressure vents from the
actuator through the positioner spool valve into the
positioner case.
DThe exhaust pressure then exits the positioner
case through the vent opening.
DThe purge tube carries the exhaust pressure
into the actuator housing.
DThe exhaust pressure then purges the actuator
housing and dissipates from the housing.
Most Fisher actuators do not have vent openings.
The exhaust pressure simply dissipates from within
the actuator housing. However, the Types 1051,
1052, and 1061 actuators feature an operational
screened vent connection when a metal access
plate is specified for the actuator housing.
When using the purge option, remember: The
actuator and positioner assembly is not airtight.
However, if you use the optional purge tube to
connect the positioner to the actuator and the
actuator has a vent opening, leave open the 1/4-inch
NPT vent connection in the actuator housing to
prevent pressure buildup in the positioner case.
If the 1/4-inch NPT vent connection is available, a
vent line can be installed from the actuator.
However, the valve/actuator/positioner assembly is
not airtight. Maintain adequate ventilation and
observe other safety measures.
For help in selecting the purge option for positioner/
actuator combinations, contact your Fisher sales
office.
Connecting the Purge Tube
The positioner mounts directly to the actuator cover
plate of Types 1051, 1052, and 1061 actuators. See
table 4 for actuator sizes.
With an integral mounting, a purge tube (key 58),
with two O-rings (key 59), can be used to relay
actuator exhaust pressure from the positioner into
the actuator housing. If the current actuator cover

3710 and 3720 Positioners Instruction Manual
Form 5300
July 2005
18
CONVERTER MODULE
TERMINAL BLOCK
FIELD WIRING
INDICATING DEVICE
GROUNDING
SCREW
EARTH
SCREW
NOTES:
FOR TROUBLESHOOTING OR MONITORING OPERATION THE
INDICATING DEVICE CAN BE A VOLTMETER ACROSS A 250 OHM
RESISTOR OR CURRENT METER
THE TYPE 3722 CONVERTER HOUSING FEATURES INTERNAL AND
EXTERNAL GROUNDING SCREWS
2
1
2
1
Figure 14. Field Wiring Diagram
plate does not have the positioner mounting holes
and purge tube knockout, order a new cover plate.
See the parts list for the specific actuator cover plate
required for each actuator.
1. The actuator cover plate features a purge tube
knockout. Locate the knockout and use appropriate
tools to open this hole in the cover plate.
2. Install the actuator cover plate and then insert the
purge tube with O-ring into the purge tube hole in the
cover plate.
Note
When mounting a positioner to an
actuator with the purge tube installed,
guide the purge tube into the vent
opening in the positioner base plate by
removing the vent screen (key 41) and
then inserting an appropriate tool such
as a screwdriver through the vent
opening into the purge tube.
When the positioner is secured to the
actuator, install the vent screen.
3. Before mounting the positioner, be sure the
second O-ring is properly fitted to the end of the
purge tube. Use care when mounting the positioner.
Be sure the purge tube with O-ring fits into the vent
opening on the rear of the positioner base plate.
60 OHMS
60 OHMS
5.6 V 5.6 V5.6 V
4−20 mA
Figure 15. Circuit Schematic
4. Secure the positioner to the mounting plate using
the (hex) socket head cap screws (key 46).
5. Install the vent screen in the positioner base
plate.
Electrical Connection for Type 3720
Positioner
WARNING
In explosion-proof applications,
disconnect power before removing the
converter housing cap.
In Class I, Division 1 explosion-proof
applications, install rigid metal conduit
and a conduit seal no more than 457
mm (18 inches) from the converter.
Personal injury or property damage
may result from explosion if the seal is
not installed.
For intrinsically-safe installations,
refer to Fisher loop schematics or to
instructions provided by the barrier
manufacturer for proper wiring and
installation.
Use the 1/2-inch NPT (or M20 thread) conduit
connection for field wiring installation. Refer to
figures 14 and 15 when connecting field wiring from
the control device to the converter. Connect the
positive wire from the control device to the
converter’s positive ( + ) terminal and the negative
wire from the control device to the converter’s
negative ( − ) terminal.
Do not overtighten the terminal screws. Maximum
torque is 0.45 Newton-meters (0.45 NSm) or 4
pounds force per inch (4 lbfSin).

3710 and 3720 Positioners
Instruction Manual
Form 5300
July 2005
19
13B8743-A
B2414/IL
12B8055-A
B2385/IL
PIPE NIPPLE
OUTPUT “B”
PIPE NIPPLE
OUTPUT “A”
PIPE NIPPLE
OUTPUT “A”
PIPE NIPPLE
OUTPUT “B”
TYPE 3710
TYPE 3722
STEM PROVIDED WHEN
GAUGE IS SPECIFIED
GAUGE
BODY PROTECTOR
BODY
PIPE BUSHING
PIPE TEE
CONNECTOR BODY
TO INSTRUMENT
PIPE TEE
PIPE BUSHING
BODY
BODY PROTECTOR
PIPE NIPPLE
SUPPLY
PIPE NIPPLE
SUPPLY
PIPE
NIPPLE
INSTR.
TYPE 3710
TYPE 3720
TYPE 3710
GAUGE
NOTE:
REMOVE PIPE PLUG,
THEN INSTALL CONNECTOR BODY
1
1
STEM PROVIDED WHEN
GAUGE IS SPECIFIED
Figure 16. Diagnostic Connections

3710 and 3720 Positioners Instruction Manual
Form 5300
July 2005
20
Diagnostic Connections
See figure 16.
For diagnostic testing of control valve packages
(valve, actuator, positioner, and accessories),
special connectors and hardware are available. The
hardware required for diagnostic connections
includes 3/4-inch NPT pipe nipples and pipe tees
with a 1/8-inch NPT pipe bushing for the connector.
The connector consists of a 1/8-inch NPT body and
body protector. If the diagnostic connectors are
ordered for a positioner with gauges, 1/8-inch stems
are also included.
Install connectors and hardware between the
positioner and the actuator.
1. Before assembling the pipe nipple, pipe tee, pipe
bushing, actuator piping, and connector body, apply
sealant (key 64) to all threads.
2. Assemble connectors and hardware. Remove
standard piping connections, if necessary, and install
the diagnostic connections.
DType 3720: For a diagnostic connection to the
instrument pressure output from the converter
module, remove the 1/8-inch NPT pipe plug (key 86)
from the Type 3722 converter housing. Apply
sealant (key 83) to the threads of the 1/8-inch NPT
connector body and install it directly into the
housing.
DTypes 3710, 3720: For diagnostic connections
made up of a pipe nipple, pipe tee, pipe bushing,
and connector body, turn the pipe tee to position the
connector body for easy access when doing
diagnostic testing.
Calibration
The following calibration procedures are for Type
3710 pneumatic positioner adjustment. For the Type
3720 electro-pneumatic positioner, there are no
A6045/IL
0.8 mm
(0.031 INCH)
Figure 17. Proper Cam Position
adjustments within the Type 3722 converter portion
of the positioner. All adjustments are accomplished
within the pneumatic portion of the positioner.
WARNING
During calibration the valve will move.
To avoid personal injury or property
damage caused by the release of
pressure or process fluid, provide
some temporary means of control for
the process.
Setting the Initial Cam Position
Before trying any calibration procedure, follow these
instructions to position the cam (key 36) with respect
to the valve position.
1. Unscrew the four captive cover screws (key 8)
and remove the positioner cover assembly (key 7).
2. See figure 18. Inspect the cam (key 36) and
loosen the cam locknut (key 37).
3. Disconnect the positioner output tubing at the
actuator and attach a regulated air source or other
means of positioning the actuator.
4. Position the actuator to correspond with the initial
valve position at minimum instrument input signal.
Stroke the actuator to the final valve position and
note the direction of actuator shaft rotation. Return
the actuator to its initial valve position.
5. See figure 17. Position the cam on the roller for
the desired input signal range, for example, 0−100%,
and insure that the arrow on the cam corresponds
with the direction of actuator shaft rotation for