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Instruction Manual
Form 5300
July 2005
Available Configurations
Type 3710: J Single- or J double-acting
pneumatic rotary valve positioner
Type 3720: J Single- or J double-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
(1)
Input Signal
Type 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)
Type 3720:
Standard: J 4 to 20 mA dc constant current with
30 V dc maximum compliance voltage
Split-Range: J 4 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.
(1)
Output Signal
Pneumatic pressure as required by the actuator
up to full supply pressure
: Field-reversible between J direct and
(2)
Action
J reverse 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.
3710 and 3720 Positioners
Table 1. Specifications
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
Type 3720 and 3722 are not approved for use
with a flammable or hazardous supply medium.
Steady-State Air Consumption
Type 3710:
Standard Spool Valve: 0.61 normal m
scfh) at 4.1 bar (60 psig) supply pressure
High-Capacity Spool Valve: 0.75 normal m
(28 scfh) at 4.1 bar (60 psig) supply pressure
Type 3720:
Standard Spool Valve: 0.80 normal m
scfh) at 4.1 bar (60 psig) supply pressure
High-Capacity Spool Valve: 0.93 normal m
(35 scfh) at 4.1 bar 60 psig supply pressure
Maximum Supply Air Demand
Output)
Standard Spool Valve: 4.1 bar (60 psig) supply,
13 normal m
High-Capacity Spool Valve: 4.1 bar (60 psig)
supply, 23 normal m
Typical Performance
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)
(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 -
(1,5)
(3)
(3)
(Double Acting
3
/hr (480 scfh)
3
/hr (860 scfh)
(1,4)
3
/hr (23
3
/hr
3
/hr (30
3
/hr
(1)
3
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