Instruction Manual
D101728X012
3710 and 3720 Positioners
September 2017
3
Table 1. Specifications
Available Configurations
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:
J
0.2 to 0.6 bar (3 to 9 psig) and 0.6 to
1.0 bar (9 to 15 psig) or
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
Output Signal
Pneumatic pressure as required by the actuator up
to full supply pressure
Action
:
Field‐reversible between
J
direct and
J
reverse within the pneumatic positioner
Supply Pressure
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
3720:
Air
Supply medium must be clean, dry, and noncorrosive
Per ISA Standard 7.0.01
A maximum 40 micrometer particle size in the air
system is acceptable. Further filtration down to 5
micrometer particle size is recommended. Lubricant
content is not to exceed 1 ppm weight (w/w) or
volume (v/v) basis. Condensation in the air supply
should be minimized
Per ISO 8573-1
Maximum particle density size:
Class 7
Oil content:
Class 3
Pressure Dew Point:
Class 3 or at least 10
_
C less than
the lowest ambient temperature expected
3720 positioners are not approved for use with
natural gas as the supply medium
Steady‐State Air Consumption
3710:
6 mm Standard Spool Valve:
0.82 normal m
3
/hr
(29 scfh) at 4.1 bar (60 psig) supply pressure
3720:
6 mm Spool Valve:
1.0 normal m
3
/hr (36 scfh) at
4.1 bar (60 psig) supply pressure
Maximum Supply Air Demand
(Double Acting Output)
6 mm Spool Valve:
20 normal m
3
/hr (700 scfh) at
4.1 bar (60 psig) supply pressure
Typical Performance
3710:
Independent Linearity:
±
0.5% of output span
Hysteresis:
0.5% of output span
Deadband:
0.3% of input span
3720:
Independent Linearity:
±
1.0% of output span
Hysteresis:
0.6% of output span
Deadband:
0.35% of input span
Electromagnetic Compatibility for 3722
Meets EN 61326‐1:2013
Immunity—Industrial locations per Table 2 of
the EN 61326‐1 standard. Performance is
shown in table 2 below.
Emissions—Class A
ISM equipment rating: Group 1, Class A
Note: Electromagnetic Interference (EMI)
specifications also apply to 3720 positioners
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
J
-40 to 80
_
C (-40 to 180
_
F),
J
-50 to 107
_
C
(-58 to 225
_
F)
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