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Reference Manual
00809-0100-4631, Rev BA
April 2007
3-5
Rosemount 1154 Series H
Figure 3-3. Jumper Wire
Placement.
Linearity Adjustment
In addition to the span and zero adjustments, there is a linearity adjustment
located inside the transmitter on the amplifier board (see Figure 3-4 on
page 3-6). Linearity is factory calibrated for optimum performance over the
calibrated range of the instrument and is not normally adjusted in the field. If
you want to maximize linearity over some particular range, use the following
procedure:
1.
Apply mid-range pressure and note the error between theoretical and
actual output signal.
2.
Apply full-scale pressure. Multiply the error noted in Step 1 by six and
by the following rangedown factor:
3.
Add the result to the full-scale output for negative errors, or subtract
the result from the full-scale output for positive errors, by adjusting the
linearity trimmer (see Figure 3-4). Example: At
4-to-1 rangedown the midscale point is low by 0.05 mA. Therefore,
adjust the “Linearity” trimmer until full-scale output increases by (0.05
mA
6
4) = 1.2 mA.
4.
Readjust zero and span.
NOTE
If you remove either cover during the above procedures, replace the O-ring
and torque the cover per the instructions given in
. Spare cover O-rings are supplied with each
transmitter.
DETAIL B
(To Elevate Zero)
DETAIL C
(To Suppress Zero)
DETAIL A
Moderate
Elevation/
Suppression
(No Jumper Wire)
Jumper Wire
Jumper
Wire
Rangedown Factor
Maximum Allowable Span
Calibrated Span
---------------------------------------------------------------------
=
1152-0289A, 0289B
, 0289C
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