Emerson Fisher 3710 Instruction Manual page 3

Instruction Manual
D101728X012
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
diodes. See figure 15.
Output Signal
Pneumatic pressure as required by the actuator up
to full supply pressure
: Field‐reversible between J direct and
(1)
Action
J reverse within the pneumatic positioner
(2)
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
(29 scfh) at 4.1 bar (60 psig) supply pressure
3720:
6 mm Spool Valve: 1.0 normal m
4.1 bar (60 psig) supply pressure
Maximum Supply Air Demand
(Double Acting Output)
6 mm Spool Valve: 20 normal m
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)
‐ continued ‐
3710 and 3720 Positioners
September 2017
(3)
3
3
/hr (36 scfh) at
(3)
3
/hr (700 scfh) at
(4)
(2)
/hr
3