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)
3660 and 3661 Positioners
D101407X012
Table 2. Standard and Split Range Capabilities
POSITIONER 3660 3660 3661
Split
One Way
1:1
Two Way
2:1
Three Way
3:1
Four Way
4:1
0.2 to 1.0 bar
(3 to 15 Psig)
Input Signal
Bar Psig Psig Bar
0.2 to 1.0 3 to 15 6 to 30 0.4 to 2.0 4 to 20
0.2 to 0.6
0.6 to 1.0
0.2 to 0.5
0.5 to 0.8
0.8 to 1.0
0.2 to 0.4
0.4 to 0.6
0.6 to 0.8
0.8 to 1.0
3 to 9
9 to 15
3 to 7
7 to 11
11 to 15
3 to 6
6 to 9
9 to 12
12 to 15
6 to 18
18 to 30
6 to 14
14 to 22
22 to 30
6 to 12
12 to 18
18 to 24
24 to 30
0.4 to 2.0 bar
(6 to 30 Psig)
Input Signal
0.4 to 1.2
1.2 to 2.0
0.4 to 1.0
1.0 to 1.6
1.6 to 2.0
0.4 to 0.8
0.8 to 1.2
1.2 to 1.6
1.6 to 2.0
4 to 20 mA DC Input Signal
4 to 12
12 to 20
4 to 9.33
9.33 to 14.66
14.66 to 20
4 to 8
8 to 12
12 to 16
16 to 20
Product Bulletin
62.1:3660
May 2012
Table 3. Positioner Input Signal, Action, and Output
Signal
Input Signal Positioner Output
Direct
0.2 to 1.0 bar (3 to 15 psig)
0.4 to 2.0 bar (6 to 30 psig)
4 to 20 mA
Reverse
1.0 to 0.2 bar (15 to 3 psig)
2.0 to 0.4 bar (30 to 6 psig)
20 to 4 mA
For split range signal refer to table 2
Up to 6.2 bar
(90 psig)
Table 4. Construction Materials
PART
Case and Cover Aluminum ---
Feedback Lever
Assembly
Range Spring N09902 ---
Input Module
Diaphragm Relay
Gasket
O‐Ring
Nozzle Aluminum ---
Flapper Aluminum ---
Relay Metal Parts
Gauges Brass and Plastic ---
All Fasteners Stainless Steel
Exterior Tubing
and Fitting
Connectors for
Diagnostic Testing
Stainless Steel ---
ECO
EPDM
Silicon Rubber
Ethylene/Propylene
Aluminum and
Stainless Steel
Copper/Brass Stainless Steel
Stainless Steel or Brass ---
MATERIAL
Standard Optional
---
---
5
Product Bulletin
62.1:3660
May 2012
3660 and 3661 Positioners
D101407X012
Principle of Operation
Refer to figure 2 for operational schematic.
The instrument pressure acts on the input module,
which controls the flapper‐nozzle system of the relay.
Supply pressure is applied to the relay, and the output
pressure of the relay is supplied to the control valve
actuator.
For a direct‐acting positioner, increases in instrument
pressure causes the input module to pivot the beam.
The beam pivots the flapper and restricts the nozzle.
The nozzle pressure increases and causes the relay
assembly to increase output pressure to the actuator.
With a direct‐acting actuator, this increased pressure
moves the actuator stem downward. Stem movement
is fed back to the beam by means of a feedback lever
and range spring, which cause the flapper to pivot
slightly away from the nozzle to prevent any further
increases in relay output pressure. The positioner is
Figure 2. Operational Schematic
once again in equilibrium but at a higher instrument
pressure, a slightly different flapper position, and a
new actuator stem position.
A decrease in instrument pressure decreases nozzle
pressure, which allows the relay to bleed off actuator
loading pressure.
Operation of a reverse‐acting positioner is similar
except that the flapper position is reversed from that
shown in figure 2. The reversed position uses the
alternate flapper pivot point so that increases in
instrument pressure rotate the flapper away from the
nozzle to reduce nozzle pressure.
With a 3661 electro‐pneumatic positioner, the
electro‐pneumatic converter provides a 0.2 to 1.0 bar
(3 to 15 psig) output pressure proportional to the
4‐20 mA input signal. The 0.2 to 1.0 bar (3 to 15 psig)
output pressure becomes the input signal pressure to
the input module.
FLAPPER
31B3960‐C
B2152‐4
FEEDBACK
PLATE
FISHER 3660 POSITIONER
FEEDBACK
LEVER
PILOT
SHAFT
INPUT
MODULE
OUTPUT
RANGE
SPRING
PIVOT
BEAM
RELAY
BEAM
GAIN ADJA
A
DIRECT
ACTING
PIVOT
SUPPLY
INPUT
MODULE
I/P CONVERTER
NOZZLE
SECTION A‐A
RANGE
SPRING
A
PIVOT
FISHER 3661 POSITIONER
REVERSE
ACTING PIVOT
RELAY
GAIN ADJ
A
INPUT SIGNAL
SUPPLY
6
3660 and 3661 Positioners
D101407X012
Figure 3. Positioner Dimensions and Connections (see table 5 for the X dimension)
ACTUATOR POST
CENTERLINE
34.32
(1.35)
49.2
(1.94)
93
(3.66)
191.2
(7.53)
4 9
(1.93)
122.3
(4.81)
67.5
(2.66)
0.5
(0.02)
Product Bulletin
DIM X
1/4 NPT
SUPPLY
CONNECTION
30
(1.18)
30
(1.18)
21.5
(0.85)
62.1:3660
May 2012
ACTUATOR
CENTERLINE
31B3959‐C
C0686‐3
34.32
(1.35)
49.2
(1.94)
142.2
(5.60)
(3.66)
ACTUATOR POST
CENTERLINE
93
122.3
(4.81)
(2.66)
27.5
(1.08)
67.5
1/2 NPT
3661 I/P
ONLY
1/4 NPT
INSTRUMENT
CONNECTION
DIM X
1/4 NPT
SUPPLY
CONNECTION
30
(1.18)
30
(1.18)
21.5
(0.85)
1/4 NPT
INSTRUMENT
CONNECTION
1/4 NPT
OUTPUT
CONNECTION
ACTUATOR
CENTERLINE
1/4 NPT
OUTPUT
CONNECTION
mm
(INCH)
7
Product Bulletin
62.1:3660
May 2012
3660 and 3661 Positioners
D101407X012
Table 5. Dimension X for figure 3
ACTUATOR CENTERLINE TO POSITIONER
Type Size
657/667
1250
3024S
Baumann
GX
30
34
40
45/46
50/60
225
450
675
1.21
1.31
1.41
16in
32in
54in
70in
225
750
1200
mm Inch
92.2
95.3
104.9
108.0
128.5
86.0
86.0
110.0
83.5
87.5
2
2
2
2
87.5
53.8
71.4
71.4
71.4
81.0
81.0
81.0
X
3.63
3.75
4.13
4.25
5.06
3.39
3.39
4.33
3.29
3.44
3.44
2.12
2.81
2.81
2.81
3.19
3.19
3.19
Installation
The supply pressure medium should be clean, dry,
filtered air. If the supply source is capable of exceeding
the maximum actuator operating pressure or
positioner supply pressure, appropriate steps must be
taken during installation to protect the positioner and
all connected equipment against overpressure.
Ordering Information
Application
When ordering, specify:
1. Type number
2. Input signal range: pneumatic or milliampere
3. Maximum supply pressure available
4. Valve plug travel: actuator type and size
5. Stroking time requirements, if critical
6. Ambient temperature range
7. Direct or reverse acting
8. Supply pressure regulator, gauges, and bypass, if
required
9. Hazardous area classification (3661)
Overall dimensions and connections are shown in
figure 3 and table 5.
8
10. Connectors for diagnostic testing, if required
3660 and 3661 Positioners
D101407X012
Figure 4. FlowScanner Diagnostic System Connections
4 IN PIPE NIPPLE
12B8052‐A
A6084
3660 POSITIONER
Product Bulletin
62.1:3660
May 2012
BODY PROTECTOR
BODY
PIPE BUSHING
PIPE TEE
1 IN PIPE NIPPLE
12B8053‐A
A6085
FISHER 3660 POSITIONER
1 IN PIPE NIPPLE
4 IN PIPE NIPPLE
3661 POSITIONER
FISHER 3661 POSITIONER
BODY PROTECTOR
BODY
PIPE BUSHING
PIPE NIPPLE
9
Product Bulletin
62.1:3660
May 2012
Table 6. Fisher 3661 Positioner Hazardous Area Classifications—CSA (Canada)
Certification Body
Intrinsically Safe
Ex ia IIC T4/T5/T6 per drawing GE28591
Class I, II Division 1 GP
CSA
1. Must be installed in a suitable IP5x enclosure.
T4/T5/T6 per drawing GE28591
Type n
Zone
Ex nA IIC T6
Class I Division 2 GP A,B,C,D T6 - - - T6 (Tamb ≤ 82°C) CSA Type 3 Encl.
Table 7. Fisher 3661 Positioner Hazardous Area Classifications —FM (United States)
Certification Body
Intrinsically Safe
Class I Zone 0 AEx ia IIC T4/T5/T6 per
drawing GE28590
Class I, II, III Division 1 GP A,B,C,D,E, F,G
FM
T4/T5/T6 per drawing GE28590
Type n
Class I Zone 2 AEx nA IIC T5
Class I Division 2, GP A,B,C,D T5
Class II, III Division 2, GP F,G T5
Certification Obtained Entity Rating Temperature Code Enclosure Rating
Vmax = 30 VDC
Imax = 150 mA
A,B,C,D,E,F,G
(1)
Certification Obtained Entity Rating Temperature Code Enclosure Rating
Pi = 1.25 W
Ci = 0 nF
Li = 0 mH
- - - T6 (Tamb ≤ 82°C) CSA Type 3 Encl.
Vmax = 30 VDC
Imax = 150 mA
Pi = 1.25 W
Ci = 0 nF
Li = 0 mH
- - - T5 (Tamb ≤ 82°C) NEMA 3, IP54
- - - T5 (Tamb ≤ 82°C) NEMA 3, IP54
T4 (Tamb ≤ 82°C)
T5 (Tamb ≤ 62°C)
T6 (Tamb ≤ 47°C)
T4 (Tamb ≤ 82°C)
T5 (Tamb ≤ 62°C)
T6 (Tamb ≤ 47°C)
3660 and 3661 Positioners
D101407X012
CSA Type 3 Encl.
NEMA 3, IP54
Table 8. Fisher 3661 Positioner Hazardous Area Classifications—ATEX
Certificate
Intrinsically Safe
Gas
ATEX
1. Special precautions are required during installation. See 3660 and 3661 Instruction Manual (D101402X012).
Ex ia IIC T4/T5/T6
Type n
Gas
Ex nA IIC T6
Certification Obtained Entity Rating Temperature Code Enclosure Rating
II 1 G
II 3 G
(1)
Ui = 30 VDC
Ii = 150 mA
Pi = 1.25 W
Ci = 0 nF
Li = 0 mH
- - - T6 (Tamb ≤ 82°C) IP44
Table 9. Fisher 3661 Positioner Hazardous Area Classifications—IECEx
Certificate
IECEx
Intrinsically Safe
Gas
Ex ia IIC T4/T5/T6
Type n
Gas
Ex nA II T6
Certification Obtained Entity Rating Temperature Code Enclosure Rating
Ui = 30 VDC
Ii = 150 mA
Pi = 1.25 W
Ci = 0 nF
Li = 0 mH
- - - T6 (Tamb ≤ 82°C) IP44
T4 (Tamb ≤ 82°C)
T5 (Tamb ≤ 62°C)
T6 (Tamb ≤ 47°C)
T4 (Tamb ≤ 82°C)
T5 (Tamb ≤ 62°C)
T6 (Tamb ≤ 47°C)
IP44
IP44
10
3660 and 3661 Positioners
D101407X012
Product Bulletin
62.1:3660
May 2012
11
Product Bulletin
62.1:3660
May 2012
3660 and 3661 Positioners
D101407X012
Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance
of any product. Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.
Fisher, Baumann, and FlowScanner are marks owned by one of the companies in the Emerson Process Management business unit of Emerson Electric Co.
Emerson Process Management, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property
of their respective owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not
to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are
governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such
products at any time without notice.
Emerson Process Management
Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Chatham, Kent ME4 4QZ UK
Dubai, United Arab Emirates
Singapore 128461 Singapore
www.Fisher.com
E 1987, 2012 Fisher Controls International LLC. All rights reserved.
12
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