Range Adjustment - Becker HPP-5 Instruction Manual

Spring
Green (20-2592)
Silver (25-1038)
Blue (25-1036)
Red (25-1037)
Table 1: Adjustable Bias Springs
Spring Range
(psi)
6
12
18
24
Table 2: Range Spring Configurations
Note: For intermediate ranges, use the next
size range spring.
HPP-5
Range
1-6
2-11
4-20
8-30
Stroke (Part Number)
4 6
01-6288 01-6287 01-6287 01-6801
25-1151 25-1152 25-1153 25-1154
25-1599 25-1600 25-1601 25-1602
25-1218 25-1219 25-1220 25-1221

Range Adjustment

Note: There will be some interaction between
range and bias adjustments. It may therefore
be necessary to readjust the bias and re-check
the range after completing the following steps.
The range, or the amount of travel be-
tween the lower and upper limits of the
input signal, is set with the range
spring. This range will typically be 12
psi for a 3-15 psi system or 24 psi for a
6-30 psi system. The limits of the range
can be defined as the initial point at
which the instrument signal
to the HPP-5 starts valve
movement until the end of
the valve stroke and full
8 12
pressure differential across
the cylinder output gauges.
After setting the bias for
1.
the start of the valve travel,
continue increasing the in-
strument signal until the
valve strokes is completed AND the
cylinder output gauges show full
power gas pressure differential.
Be sure not to overshoot at this
2.
point as any signal level above this
upper limit will show the same read-
ing on the cylinder gauges. This
point is the highest end of the range
and the value may not necessarily
be equal to the desired upper range
value.
10
HPP-5 Positioner
Range Adjustment
September 1999