3660 Bypass Operation - Fisher 3660 Instruction Manual

3660 and 3661 Positioners
September 2015
Table 8. Range Spring Selection for Baumann Actuators
TYPE
0.2 to 1.0 bar
(3 to 15 Psig)
Input Signal
Split
Range Span
Bar
(Psig) (Psi)
One Way 0.2 to 1.0
1:1 (3 to 15)
0.2 to 0.6
(3 to 9)
Two Way
2:1 0.6 to 1.0
(9 to 15)
0.2 to 0.5
(3 to 7)
Three Way 0.5 to 0.8
3:1 (7 to 11)
0.8 to 1.0
(11 to 15)
0.2 to 0.4
(3 to 6)
0.4 to 0.6
Four Way (6 to 9)
4:1 0.6 to 0.8
(9 to 12)
0.8 to 1.0
(12 to 15)
1. Contact your Emerson Process Management sales office
2. Pilot shaft setting is the A dimension in figure 20.
Figure 20. Pilot Shaft Setting
PILOT SHAFT
(KEY 19A)
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
26
3660
0.4 to 2.0 bar
(6 to 30 Psig)
Input Signal
Range Span
Bar Bar Bar
(Psig) (Psi)
0.8 0.4 to 2.0 1.6
(12) (6 to 30) (24)
0.4 to 1.2
(6 to 18)
0.4 0.8
(6) 1.2 to 2.0 (12)
(18 to 30)
0.4 to 0.97
(6 to 14)
0.3 0.97 to 1.5 0.55
(4) (14 to 22) (8)
1.5 to 2.0
(22 to 30)
0.4 to 0.8
(6 to 12)
0.8 to 1.2
0.2 (12 to 18) 0.4
(3) 1.2 to 1.6 (6)
(18 to 24)
1.6 to 2.0
(24 to 30)
for range spring ordering information.
A
FEEDBACK LEVER
ASSEMBLY (KEY 19)
FEEDBACK SHAFT
LOCATION
3661
4 to 20 mA DC
Input Signal (1/2 to 3/4 inch)
Range Spring
Range Span
Selection
mA mA
(key 30)
For Baumann
4 to 20 16
Actuators
4 to 12
8 Standard
12 to 20
4 to 9.33
9.33 to 14.66 5.33 Split Range
14.66 to 20
4 to 8
8 to 12
4 Split Range
12 to 16
16 to 20
Instruction Manual
VALVE STEM TRAVEL
12.7 to 19 mm
Approximate
Range Spring
Pilot Shaft
Selection
(2)
Setting
(1)
(key 30)
mm (Inch)
For Baumann
89 (3.50)
Actuators
92 (3.63) Split Range
70 (2.75) Split Range
95 (3.75) - - -
D101402X012
19.1 to 50 mm
(3/4 to 2 inch)
Approximate
Pilot Shaft
(2)
Setting
(1)
mm (Inch)
129 (5.09)
92 (3.63)
137 (5.38)
- - -