Emerson Fisher 3710, Fisher 3720 Data Sheet
Product Bulletin
3710 and 3720 Positioners
D200437X012
62.1:3710
February 2015
Fisherr 3710 and 3720 Positioners and 3722
Electro-Pneumatic Converter
Fisher 3710 pneumatic and 3720 electro-pneumatic
positioners are designed for use with either diaphragm
or piston rotary actuators. These positioners provide a
valve ball or disk position for a specific input signal.
The 3710 provides a valve position in response to a
pneumatic input signal. The 3720 is created by the
addition of a Fisher 3722 electro-pneumatic converter
to the 3710 positioner. The positioner provides a valve
position in response to a DC current input signal. Either
type can easily be configured as single- or doubleacting for rotary actuators.
W6144
SUPPLY
CONNECTION
W6058-1
FISHER 3710 POSITIONER
MOUNTED ON A 1066 ACTUATOR
FISHER 3720 POSITIONER
MOUNTED ON A 1052 ACTUATOR
1/2 NPT OR M20
CONDUIT CONNECTION
W6145
FISHER 3722 ELECTRO-PNEUMATIC CONVERTER
SUPPLY
CONNECTION
EXTERNAL
GROUNDING
SCREW
www.Fisher.com
Product Bulletin
62.1:3710
February 2015
Specifications
3710 and 3720 Positioners
D200437X012
Available Configuration
3710:
J Single- or J double-acting pneumatic rotary
valve positioner
3720:
J Single- or J double-acting
electro-pneumatic rotary valve positioner consisting
of a 3710 with a 3722 attached
3722: An electro-pneumatic converter that converts
a 4-20 mA DC input signal to a 0.2 to 1.0 bar
(3 to 15 psig) signal for the pneumatic positioner
Input Signal
3710:.
Standard:
J 0.2 to 1.0 bar (3 to 15 psig) or J 0.4 to
2.0 bar (6 to 30 psig)
Split-Range:
1.0 bar (9 to 15 psig) or
J 0.2 to 0.6 bar (3 to 9 psig) and 0.6 to
J 0.4 to 1.2 bar (6 to 18 psig)
and 1.2 to 2.0 bar (18 to 30 psig)
3720:.
Standard:
J 4-20 mA DC constant current with
30 VDC maximum compliance voltage
Split-Range:
J 4-12 mA DC or 12-20 mA DC
Equivalent Circuit
3720: 120 ohms shunted by three 5.6 V zener diodes
Output Signal
Pneumatic pressure as required by the actuator up to
full supply pressure
(1)
Action
: Field reversible between direct and reverse
3720:.
6mm Spool Valve: 1.0 normal m
3
/hr (36 scfh) at
4.1 bar (60 psig) supply pressure
Maximum Supply Air Demand
6 mm Spool Valve: 20 normal m
(4)
(Double-Acting)
3
/hr (700 scfh) at
4.1 bar (60 psig) supply pressure
Typical Performance
(5)
3710 Pneumatic Positioner
Independent Linearity: ±0.5% of output span
Hysteresis: 0.5% of output span
Deadband: 0.3% of input span
3720 Electro-Pneumatic Positioner
Independent Linearity: ±1.0% of output span
Hysteresis: 0.6% of output span
Deadband: 0.35% of input span
Electromagnetic Compatibility for 3722
electro-pneumatic converter:
Meets EN 61326-1 (First Edition)
Immunity—Industrial locations per Table 2 of
the EN 61326-1 standard. Performance is
shown in table 1 below.
Emissions—Class A
ISM equipment rating: Group 1, Class A
Note: Electromagnetic Compatibility specifications
also apply to the 3720 positioner
Supply Pressure
(2)
Minimum 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
Supply Medium
3710: Air or Natural Gas
(3)
3720: Air
The 3720 positioner is not approved for use with
Natural Gas as the supply medium
Steady-State Air Consumption
3710:
6 mm Spool Valve: 0.82 normal m
(4)
3
/hr (29 scfh) at
4.1 bar (60 psig) supply pressure
2
-continued-
Operating Influences
Supply Pressure Sensitivity: A 10% change in supply
pressure changes the valve shaft position less than
the following percentages of valve rotation:
3710: 1.0% at 4.1 bar (60 psig) supply pressure
3720: 1.5% at 4.1 bar (60 psig) supply pressure
Operative Temperature Limits
-40 to 80_C (-40 to 180_F),
J
J -50 to 107_C (-58 to 225_F)
(2)
Construction Materials
Positioner Base: Low copper aluminum alloy
Cover: Polyester plastic
Feedback Shaft: Stainless steel
Range Spring: Stainless steel
3710 and 3720 Positioners
D200437X012
Specifications (Continued)
Product Bulletin
62.1:3710
February 2015
Construction Materials (continued)
Input Module Diaphragm, O-rings:
J Ethylene-propylene (EPDM)
Spool Valve: SST/C72900
J Nitrile or
office for classification/certification specific
information
Note: This classification also applies to the 3720
positioner
Tubing: Copper (standard)
Fittings: Brass (standard)
Gauges: Chrome-plated brass connection with plastic
case
Connectors for diagnostic testing:
J Brass
J Stainless steel or
Hazardous Area Classification for 3710 Positioner
3710 pneumatic positioners comply with the
requirements of ATEX Group II Category 2 Gas and
Dust
Electrical Classifications for 3722 Converter
CSA—Intrinsically Safe, Explosion-proof, Type n,
Dust-Ignition Proof
FM—Intrinsically Safe, Explosion-proof, Type n,
Non-incendive, Dust-Ignition Proof
Meets Customs Union technical regulation TP TC
012/2011 for Groups II/III Category 2 equipment
II Gb c T*X
III Db c T*X
ATEX—Intrinsically Safe, Flameproof, Type n
IECEx—Intrinsically Safe, Flameproof, Type n
Note: These ratings do not apply to the 3720
positioner
Refer to tables 2, 3, 4, and 5 for additional approvals
information
Note: These classifications also apply to the 3720
Pressure Connections
1/4 NPT internal
positioner
Electrical Connection for 3720 Positioner
Housing Classification for 3722 Converter
1/2-14 NPT conduit connection
CSA— Type 3 Encl.
FM— NEMA 3, IP54
ATEX— IP64
Rotary Valve Rotation
J 90 degrees (standard) J 60 degrees (optional)
IECEx— IP54
Options
Mount instrument with vent on side or bottom if
weatherproofing is a concern
Note: These classifications also apply to the 3720
positioner
Span Adjuster Assembly:
psig) input range or,
J 0.2 to 1.0 bar (3 to 15
J 0.4 to 2.0 bar (6 to 30 psig)
input range
Elastomers (O-rings, diaphragm):
J standard
temperature range, -40 to 80_C (-40 to 180_F),
Other Classifications/Certifications for 3722
Converter
CUTR— Customs Union Technical Regulations (Russia,
Kazakhstan, and Belarus)
J extended temperature range -50 to 107_C (-58 to
225_F)
J Special applications, J Beacon indicator,
J Gauges
(6)
, tire valves, or connectors for diagnostic
testing
INMETRO—National Institute of Metrology, Quality
and Technology (Brazil)
KGS—Korea Gas Safety Corporation (South Korea)
Contact your Emerson Process Management sales
NOTE: Specialized instrument terms are defined in ANSI/ISA Standard 51.1 - Process Instrument Terminology.
1. Direct-acting, an increasing input signal extends actuator rod. Reverse-acting, an increasing input signal retracts actuator rod.
2. The pressure and temperature limits in this document and any applicable standard or code limitation should not be exceeded.
3. Natural gas should not contain more than 20 ppm of H
4. Normal m
5. Typical values determined by tests with a 1061 size 30 actuator at 4.1 bar (60 psig) supply pressure. Performance may vary with other actuator types and supply pressures.
6. Gauges not available for high temperature range.
3
/hr--Normal cubic meters per hour (0_C and 1.01325 bar, absolute); Scfh--Standard cubic feet per hour (60_F and 14.7 psia).
S.
2
Approximate Weight
3710: 2.04 kg (4.5 pounds)
3720: 2.72 kg (6.0 pounds)
3
Product Bulletin
62.1:3710
February 2015
3710 and 3720 Positioners
D200437X012
Table 1. Fisher 3722 Electro-Pneumatic Converter
Port Phenomenon Basic Standard Test Level
Electrostatic Discharge (ESD) IEC 61000-4-2
Enclosure
I/O signal/control
Specification limit = ±1% of span
1. The information contained in the table also applies to the 3720 positioner.
2. A = No degradation during testing. B = Temporary degradation during testing, but is self-recovering.
Radiated EM field IEC 61000-4-3
Rated power frequency magnetic
field
Burst (fast transients) IEC 61000-4-4 1 kV A
Surge IEC 61000-4-5 1 kV (line to ground only) B
Conducted RF IEC 61000-4-6 150 kHz to 80 MHz at 3 volts A
Features
(1)
EMC Summary Results—Immunity
4 kV contact;
8 kV air
80 to 1000 MHz @ 10V/m with 1 kHz AM at 80%
1400 to 2000 MHz @ 3V/m with 1 kHz AM at 80%
2000 to 2700 MHz @ 1V/m with 1 kHz AM at 80%
IEC 61000-4-8 60 A/m at 50 Hz A
n Extended Temperature Capability—With EPDM
O-rings and input module diaphragm, 3710 and
3720 positioners can be used in low-temperature
n Accurate, Fast Response—3710 and 3720
and high-temperature applications.
positioners use field-proven spool valve technology
for a simple design that gives accurate,
fast-responding operation with high cycle life.
These positioners are able to withstand the severe
vibrations of most plant environments.
n Meets Special Application Requirements— 3710 and
3720 positioners with EPDM O-rings and input
module diaphragm can be used in applications with
special material requirements as in the food and
beverage industry, pharmaceuticals, and tobacco
processing.
n Modular Construction—The 3710 positioner
converts easily to a 3720 positioner by adding the
3722 electro-pneumatic converter. The converter
mounts over the instrument and supply ports in the
3710 positioner base. This provides a simple,
compact, and cost-effective field conversion from
pneumatic to electro-pneumatic valve positioning.
n Easy Positioner Adjustments—With the cover
removed (figure 1), all internal components are
easily accessed. Zero and span adjustments are
made by hand with no tools required.
n Stable Operation—Changes in supply pressure and
ambient temperature have minimal effect on
positioner operation.
Performance
Criteria
A
A
(2)
n Corrosion-Resistant Construction with Air
Purge—Case, components, and gasket materials
withstand harsh environments. Proven engineered
resins and 300 Series stainless steel construction is
used throughout each unit. Die castings are low
copper aluminum alloy to maximize corrosion
resistance. Positioner bleed air purges internal
positioner parts. As an option with some Fisher
actuators, bleed air also purges the actuator
housing for additional protection.
4
n Control Valve Diagnostic Testing Capability—To
support diagnostic testing of
valve/actuator/positioner packages, connectors,
piping, and other hardware can be installed
between the 3710 positioner and the actuator. A
typical connector installation is shown in figure 5.
n Valve Position Indicator—Standard, low-profile
indicator or optional, beacon-style indicator mount
easily to the positioner cover.
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