Input Signal Ranges; Valve Positioner Split-Range Operation - Emerson Fisher 3582i Instruction Manual

Instruction Manual
D200138X012
With a reverse‐acting or split‐range valve positioner, the bypass handle may be locked in the POSITIONER position so
that bypass cannot be used. To lock the bypass handle in the POSITIONER position, first shut off the instrument and
supply pressure to the valve positioner. Then, remove the hex head shoulder screw from the center of the handle.
Remove the handle and rotate it 180 degrees and re‐install it with the handle between the two lugs cast on the bypass
block. Replace the shoulder screw.

Input Signal Ranges

Standard input signal ranges for valve positioners and valve stem position transmitters are shown in table 9. Changing
from one standard range to another requires changing the range spring. To change the range spring, refer to the
instructions for changing the range spring in the maintenance section of this manual. Split‐range operation of 3582
valve positioners or the 3582i valve positioner normally does not require changing the spring. Refer to the section
below for split‐range information.
Table 9. Standard Instrument Input Signals and Range Springs
INSTRUMENT INPUT SIGNAL
RANGE
0.2-1.0 bar (3-15 psig)
(2)
4-20 mA
0.4-2.0 bar (6-30 psig)
1. Minimum and maximum allowable input signals ensure functional operation.
2. For 3582i only.
Valve Positioner Split‐Range Operation
3582 valve positioners and the 3582i valve positioner are suitable for split‐range operations. In split‐range operation,
the input signal, either pneumatic or DC current, from a single control device is split between two or more control
valves. No additional parts are required to use an existing valve positioner for split‐range operation.
Table 10 shows some typical split‐ranges for the valve positioners.
Table 10. Split‐Range Capabilities
Split
Two‐way
Three‐way
Split
Two‐way
Three‐way
To change to split‐range operation, perform the beam alignment procedures then perform the calibration procedure
using the desired split range inputs that result in full valve travel. For example, for a 3582 positioner with a 0.2 to 1.0
bar (3 to 15 psig) input signal range in a two‐way split, a 0.6 bar (9 psig) input signal should completely stroke the valve
for a 0.2 to 0.6 bar (3 to 9 psig) signal range.
Note
The flapper must approach the nozzle squarely at the midpoint value of the input signal range for proper operation.
ALLOWABLE INPUT SIGNAL
STANDARD SPAN
Minimum
0.8 bar (12 psig) 0.07 bar (1 psig)
16 mA 2 mA
1.6 bar (24 psig) 0.07 bar (1 psig)
0.2 to 1.0 Bar or 3 to 15 Psig Input Signal
Bar
0.2 to 0.6
0.6 to 1.0
0.2 to 0.5
0.5 to 0.7
0.7 to 1.0
(1)
Maximum
1.4 bar (21 psig)
22 mA
2.4 bar (35 psig)
3582 POSITIONERS
0.4 to 2.0 Bar or 6 to 30 Psig Input Signal
Psig
3 to 9 0.4 to 1.2
9 to 15 1.2 to 2.0
3 to 7 0.4 to 0.9
7 to 11 0.9 to 1.5
11 to 15 1.5 to 2.0
3582i POSITIONER
4‐20 Milliampere Input Signal
4 to 12
12 to 20
4 to 9.3
9.3 to 14.7
14.7 to 20
3582, 582i, and 3583
RANGE SPRING RANGE SPRING PART
COLOR NUMBER
Silver 1V621727012
Red 1V621927012
Bar Psig
6 to 18
18 to 30
6 to 14
14 to 22
22 to 30
January 2013
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