Instruction Manual
D101402X012
3660 and 3661 Positioners
September 2015
26
Table 8. Range Spring Selection for Baumann Actuators
TYPE 3660 3661 VALVE STEM TRAVEL
Split
0.2 to 1.0 bar
(3 to 15 Psig)
Input Signal
0.4 to 2.0 bar
(6 to 30 Psig)
Input Signal
4 to 20 mA DC
Input Signal
12.7 to 19 mm
(1/2 to 3/4 inch)
19.1 to 50 mm
(3/4 to 2 inch)
Range
Bar
(Psig)
Span
Bar
(Psi)
Range
Bar
(Psig)
Span
Bar
(Psi)
Range
mA
Span
mA
Range Spring
Selection
(key 30)
(1)
Approximate
Pilot Shaft
Setting
(2)
mm (Inch)
Range Spring
Selection
(key 30)
(1)
Approximate
Pilot Shaft
Setting
(2)
mm (Inch)
One Way
1:1
0.2 to 1.0
(3 to 15)
0.8
(12)
0.4 to 2.0
(6 to 30)
1.6
(24)
4 to 20 16
For Baumann
Actuators
89 (3.50)
For Baumann
Actuators
129 (5.09)
Two Way
2:1
0.2 to 0.6
(3 to 9)
0.6 to 1.0
(9 to 15)
0.4
(6)
0.4 to 1.2
(6 to 18)
1.2 to 2.0
(18 to 30)
0.8
(12)
4 to 12
12 to 20
8 Standard 92 (3.63) Split Range 92 (3.63)
Three Way
3:1
0.2 to 0.5
(3 to 7)
0.5 to 0.8
(7 to 11)
0.8 to 1.0
(11 to 15)
0.3
(4)
0.4 to 0.97
(6 to 14)
0.97 to 1.5
(14 to 22)
1.5 to 2.0
(22 to 30)
0.55
(8)
4 to 9.33
9.33 to 14.66
14.66 to 20
5.33 Split Range 70 (2.75) Split Range 137 (5.38)
Four Way
4:1
0.2 to 0.4
(3 to 6)
0.4 to 0.6
(6 to 9)
0.6 to 0.8
(9 to 12)
0.8 to 1.0
(12 to 15)
0.2
(3)
0.4 to 0.8
(6 to 12)
0.8 to 1.2
(12 to 18)
1.2 to 1.6
(18 to 24)
1.6 to 2.0
(24 to 30)
0.4
(6)
4 to 8
8 to 12
12 to 16
16 to 20
4 Split Range 95 (3.75) - - - - - -
1. Contact your Emerson Process Management sales office for range spring ordering information.
2. Pilot shaft setting is the A dimension in figure 20.
Figure 20. Pilot Shaft Setting
A
PILOT SHAFT
(KEY 19A)
FEEDBACK LEVER
ASSEMBLY (KEY 19)
FEEDBACK SHAFT
LOCATION
38B0195‐B
3660 Bypass Operation
3660 positioners may be supplied with a bypass assembly.
CAUTION
Do not use bypass operation when the positioner is reverse acting or is in split‐range operation. In these cases, bypassing
the positioner sends the input signal directly to the actuator. Such a change will affect the desired operation and possibly
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