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Reference Manual
00809-0100-4388, Rev BA
January 2008
Rosemount 1153 Series D
3-6
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 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 on page 3-8). 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 ϫ
6 ϫ 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 Section 5
Maintenance and Troubleshooting. Spare cover O-rings are supplied with
each transmitter.
Rangedown Factor
Maximum Allowable Span
Calibrated Span
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