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 cartridge. If re-
quired, 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 po-
sitioner along with the spring inside
it.
For open on increasing positioner:
Remove the mounting bracket hold-
ing the cap on the bottom of the posi-
tioner. Then remove this cap along
with the spring inside it.
2.
Replace the cap and spring with the
larger bias spring cartridge and bias
spring found in the kit. Make sure
the bias adjustment screw in the
bias spring cartridge is snug against
the bias spring and the spring is cen-
tered 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
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:
6”
25-6014 25-1465
Proportional:
35-0522
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 part numbers.
Stroke
With
Without
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
3. (Cont.) Reattach the mounting
bracket upside down from its original
position.
4. Slide the thread spacer (brass
bushing) over the adjusting screw
and tighten the washer and jam nut
against the thread spacer.
5.
If a range spring was sent with the
kit, remove the existing range spring
and replace it with the new one.
6.
Adjust the unit per the Adjustment
Procedures.
HPP-4
13
September 1999
HPP-4 Positioner
Split Range
