Rosemount 1151GP - Zero Adjustment Range

Reference Manual
00809-0100-4360, Rev BA
August 2008
Rosemount 1151
4-14
Zero Adjustment Range The zero on a Rosemount 1151 Analog with the E or G output options can be
adjusted for up to 500% suppression or 600% elevation. See Figure 4-8.
Figure 4-8. Zero Adjustment
Range.
The zero may be elevated or suppressed to these extremes with the limitation
that no pressure within the calibrated range exceeds the full-range pressure
limit. For example, a Range 4 transmitter cannot be calibrated for 100 to 200
inH
2
O (24.8 to 49.7 kPa) (only 100% zero suppression) because 200 inH
2
O
exceeds the 150 inH
2
O full-range pressure limit of a Range 4.
To make large elevation or suppression adjustments, it is necessary to move
the jumper on the component side of the amplifier board. Figure 4-9 on page
-15 shows elevation and suppression jumper settings. The jumper has three
positions. The middle position allows normal levels of elevation or
suppression. For larger adjustments, move the jumper to the ELEVATE ZERO
(EZ) or SUPPRESS ZERO (SZ) as marked.
NOTE
Always make sure that the jumper is fully seated on its pins. If the jumper has
not been placed in any of the three positions, the amplifier board will provide
normal levels of elevation or suppression. A slide switch replaces the jumper
pin on some versions of the amplifier board.
600% Zero Elevation
600% Zero Elevation*
–150 –125 –100
–75
–50 –25 0
25
4
Pressure
(inH
2
O)
Pressure
(inH
2
O)
0 25
4
20
No Zero Elevation or Suppression*
4
20
Output
(mA)
500% Zero Elevation
500% Zero Suppression*
Output
(mA)
*Graphs based on a range 4 (0-25 inH
2
O to 0-150 inH
2
O) 1151
with a calibrated span of 25 inH
2
O.
0
25
50
75
100
125
150
20
Output
(mA)