Conversion to Split Range
Converting a standard positioner to a split
range positioner (pneumatic input other than
3-15 psi or 6-30 psi), requires ordering the
proper conversion kit from the factory. This kit
will include a bias spring and bias spring car-
tridge. If required, it will also contain a new
range spring and mounting spacers.
1.
For close on increasing positioner:
Remove the cap on the top of the posi-
tioner along with the spring inside it.
For open on increasing positioner:
Remove the mounting bracket holding the
cap on the bottom of the positioner. Then
remove this cap along with the spring in-
side it.
2.
Replace the cap and spring with the larger
bias spring cartridge
and
bias spring
found in the kit. Make sure the
bias ad-
justment screw
in the
bias spring car-
tridge
is snug against the
bias spring
and
the spring is centered before tightening the
spring cartridge.
3.
For open on increasing positioner:
Remove the
washer
and
jam nut
from the
adjusting screw
in the
bias spring car-
tridge
. Reattach the mounting bracket up-
side down from its original position.
HPP-SB Positioner
Split Range
Stroke Close on
Increasing
Open on
Increasing
Reference
Drawings
4”
25-6014
25-1464
Proportional:
35-0513
35-0313/A
35-0511
35-0511/A
Tailrod Mount:
35-0533
6”
25-6014
25-1465
Proportional:
35-0522
35-0529
8”
25-6014
25-1466
Tailrod:
Table 5
: Split Range Conversion Kits
Note
: Refer to
Table 1
and
Table 2
for Bias
and Range Spring
Stroke
With
Transmitter
Without
Transmitter
4
25-8265
25-8001
6
25-8136
25-1093
8
25-1402
25-1423
Table 4
: Extension Rods for Positioners to
Close on Increasing Signal
Slide the
thread spacer
(brass bushing)
over the
adjusting screw
and tighten the
washer
and
jam nut
against the
thread
spacer
.
4.
If a range spring was sent with the kit, re-
move the existing range spring and replace
it with the new one.
5.
Adjust the unit per the Adjustment Proce-
dures.
HPP-SB
10
September 1999
Содержание HPP-SB
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