Emerson Fisher 3660, Fisher 3661 Data Sheet
3660 and 3661 Positioners
D101407X012
FisherR 3660 and 3661 Positioners
Fisher 3660 pneumatic and 3661 electro‐pneumatic
single‐acting positioners are used with various
actuators on sliding‐stem valves for throttling
applications. These rugged positioners provide a valve
position proportional to a pneumatic input or a
standard millampere DC input signal received from a
control device.
Features
n Accurate, Efficient, Vibration‐Resistant
Operation—Positioner design provides accurate,
fast‐responding instruments able to withstand the
vibrations of most plant environments. Low
steady‐state air consumption contributes to
efficient operation.
Product Bulletin
62.1:3660
May 2012
n Variable Gain—Easily adjustable gain and damping
adjustments fine tune the positioner stability to
specific application requirements.
n Versatility—Positioner accepts a standard
pneumatic input signal (3660) or a standard
milliampere DC input signal (3661) from a control
device. This positioner provides split range
capabilities and adjustable zero and spans.
n Fewer Spare Parts Required—Most of the parts for
3660 and 3661 positioners are interchangeable,
requiring fewer spare parts to support these
positioners.
n Rugged Construction—The case and cover are
designed to withstand mechanical vibration and
rough handling.
Fisher 3660 Positioner with
Baumannt Valve and Actuator
W7174
n Easy Positioner Adjustments—Zero and span
adjustments can be made with the cover in place.
n Control Valve Diagnostic Testing Capability—To
support diagnostic testing of
valve/actuator/positioner packages with the
FlowScannert valve diagnostic system,
connectors, piping, and other hardware can be
installed between the 3660 or 3661 positioner and
the actuator. A typical connector installation is
shown in figure 4.
www.Fisher.com
Product Bulletin
62.1:3660
May 2012
Specifications
3660 and 3661 Positioners
D101407X012
Available Configuration
3660: Single‐acting pneumatic valve positioner
3661: Single‐acting electro‐pneumatic valve
positioner
Input Signal
3660:
J0.2 to 1.0 bar (3 to 15 psig), J0.4 to 2.0 bar
(6 to 30 psig), or
JSplit range, see table 2
3661:
J4‐20 mA DC constant current with 30 VDC
maximum compliance voltage
JSplit range is also
available, see table 2
Equivalent Circuit (3661)
120 ohms shunted by three 5.6 V zener diodes
Output Signal
Type: Pneumatic pressure as required by the actuator
up to full supply pressure
Action:
positioner output),
JDirect (increasing input signal increases
JReverse (increasing input signal
decreases positioner output)
Supply Pressure
(1)
Recommended: 10% above actuator requirements
Maximum: 6.2 bar (90 psig) or pressure rating of
actuator, whichever is lower
Medium: air
3660 and 3661 are not compatible with natural gas as
the supply medium
Performance
Independent Linearity: ±1% of output span.
Hysteresis: 0.5% of output span
(2)
.
Deadband: 0.1% of input span.
Electromagnetic Compatibility for 3661
electro‐pneumatic positioner:
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
‐ continued ‐
Positioner Adjustments
Span: Adjustable from 19 mm to 50 mm
(0.75 to 2 inches) stem travel
Zero: 0 to 100%
Gain: 0.5 to 6% PB (proportional band)
(3)
.
Output Volume Damping: Loop dynamic response
adjustment
(4)
Delivery Capacity
1.4 Bar (20 Psig) Supply: 4.3 normal m
:
3
/hour
(150 scfh)
2.4 Bar (35 Psig) Supply: 6.6 normal m
3
/hour
(230 scfh)
(4)
Exhaust Capacity
1.4 Bar (20 Psig) Supply: 4.8 normal m
:
3
/hour
(170 scfh)
2.4 Bar(35 Psig) Supply: 7.4 normal m
3
/hour
(260 scfh)
Steady‐State Air Consumption
(4,5)
3660: 0.17 normal m3/hour (6.0 scfh) at
1.4 bar (20 psig) supply pressure.
0.22 normal m
3
/hour (7.9 scfh) at 2.4 bar (35 psig)
supply pressure
3661: 0.24 normal m
(20 psig) supply pressure. 0.33 normal m
3
/hour (8.8 scfh) at 1.4 bar
3
/hour
(12.3 scfh) at 2.4 bar (35 psig) supply pressure
Operating Influences
Supply Pressure: 69 mbar (1 psig) change in supply
pressure changes the actuator stem position less than
(6)
0.16%
Operative Temperature Limits
of the travel
(1)
3660 without Pressure Gauges: -40 to 121°C
(-40 to 250°F)
3660 with Pressure Gauges: -40 to 82°C
(-40 to 180°F)
3661 with or without Pressure Gauges: -40 to 82°C
(-40 to 180°F)
Hazardous Area Classification for 3660
3660 pneumatic positioners comply with the
requirements of ATEX Group II Category 2 Gas and
Dust
2
3660 and 3661 Positioners
D101407X012
Specifications (continued)
Product Bulletin
62.1:3660
May 2012
Hazardous Area Classification for 3661
CSA—Intrinsically Safe, Type n, Non‐incendive
Conduit Connection for 3661
1/2 NPT (M20 or PG13 adaptors optional)
FM—Intrinsically Safe, Type n, Non‐incendive
ATEX—Intrinsically Safe, Type n
(Gas Atmospheres Only)
Vent Connection
1/4 NPT internal
IECEx—Intrinsically Safe, Type n
(Gas Atmospheres Only)
Refer to tables 6, 7, 8, and 9 for additional
information
Housing Classification for 3661
CSA—Type 3 Encl.
Maximum Valve Stem Travel
50 mm (2 inch); adjustable to obtain lesser travel with
standard input signal—minimum 19 mm (0.75 inch)
Construction Materials
See table 4
FM—NEMA 3, IP54
ATEX—IP44
IECEx—IP44
Mounting orientation requires vent location to be
Approximate Weight
3660: 2.6 pounds (1.2 kg)
3661: 3.0 pounds (1.4 kg)
below horizontal
Options
Mounting
The positioner can be mounted in one of four
different configurations. See figure 1.
Pressure Connections
1/4 NPT internal
NOTE: Specialized instrument terms are defined in ANSI/ISA Standard 51.1 - Process Instrument Terminology.
1. The pressure/temperature limits in this bulletin and any applicable standard or code limitation should not be exceeded.
2. Hysteresis value at a gain setting of 1/2 turn.
3. Adjusting the gain (PB) adjustment will change the nozzle flapper relationship. This nozzle flapper change affects the actuator/positioner response time.
4. Normal m
5. Air consumption at a gain setting of 1/2 turn.
6. At supply pressure of 2.4 bar (35 psig).
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).
3660:
JInstrument and output pressure gauges,
JIntegrally mounted bypass valve
3661: Output pressure gauge
3660 and 3661: Connectors for diagnostic testing
Jstainless steel or Jbrass
Table 1. Fisher 3661 Electro‐Pneumatic Positioner EMC Summary Results—Immunity
Port Phenomenon Basic Standard Test Level Performance Criteria
Electrostatic discharge
(ESD)
Enclosure
I/O signal/control
Specification limit = ±1% of span
1. 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 IEC 61000‐4‐4 1 kV A
Surge IEC 61000‐4‐5 1 kV (line to ground only, each) B
Conducted RF IEC 61000‐4‐6 150 kHz to 80 MHz at 3 Vrms A
IEC 61000‐4‐2
IEC 61000‐4‐8 60 A/m at 50 Hz A
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%
(1)
A
A
3
Product Bulletin
62.1:3660
May 2012
Figure 1. Mounting Configurations (see table 3 for Positioner Action and Signals)
3660 and 3661 Positioners
D101407X012
PILOT SHAFT
1
ACTUATOR: AIR‐TO‐RETRACT
POSITIONER ACTION: DIRECT
(INCREASING INPUT SIGNAL INCREASES
OUTPUT PRESSURE TO ACTUATOR)
1
OUTPUT
AIR SUPPLY
INPUT SIGNAL
OUTPUT
AIR SUPPLY
INPUT SIGNAL
FEEDBACK
PLATE
2
ACTUATOR: AIR‐TO‐RETRACT
POSITIONER ACTION: REVERSE
(INCREASING INPUT SIGNAL DECREASES
OUTPUT PRESSURE TO ACTUATOR)
2
OUTPUT
INPUT
SIGNAL
AIR SUPPLY
OUTPUT
INPUT
SIGNAL
AIR SUPPLY
ACTUATOR: AIR‐TO‐EXTEND
POSITIONER ACTION: REVERSE
(INCREASING INPUT SIGNAL DECREASES
OUTPUT PRESSURE TO ACTUATOR)
Notes:
1 When mounting on Baumann actuators, install feedback plate so lip is up. Install feedback lever arm assembly so pilot shaft is on
top of the feedback plate.
2 When mounting on Baumann actuators, install feedback plate so lip is down. Install feedback lever arm assembly so pilot shaft is
underneath the feedback plate.
17B9106‐B
17B9105‐B
38B0195‐B
A4035‐2
4
ACTUATOR: AIR‐TO‐EXTEND
POSITIONER ACTION: DIRECT
(INCREASING INPUT SIGNAL INCREASES
OUTPUT PRESSURE TO ACTUATOR)
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