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Reference Manual
00809-0100-4514, Rev BA
January 2008
3-5
Rosemount 1154
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). 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.
Figure 3-4. Linearity and
Damping Adjustment.
Damping Adjustment Damping electronics are available as an option. Transmitters with standard
electronics can be retrofitted with the adjustable damping feature by changing
out both the amplifier board (RMT P/N 01154-0021-0004) and the calibration
board (RMT P/N 01154-0023-0002).
Rangedown Factor
Maximum Allowable Span
Calibrated Span
-------------------------------------------------------------------- -=
Damping
Adjustment
(Optional)
Linearity
Adjustment
Electronics Side of
Transmitter
Housing (Cover
Removed)