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Reference Manual
00809-0100-4808, Rev CA
June 2008
2-11
Rosemount 3051N
To rerange the transmitter using the span and zero buttons, perform the
following procedure:
1. Loosen the screw holding the label on top of the transmitter housing,
and rotate the label to expose the zero and span buttons (see Figure
2-6).
2. Using a pressure source with an accuracy three to ten times the
desired calibrated accuracy, apply a pressure equivalent to the lower
range value to the high side of the transmitter.
3. To set the 4 mA point, press and hold the zero button for at least two
seconds, then verify that the output is 4 mA. If a meter is installed, it
will display ZERO PASS.
4. Apply a pressure equivalent to the upper range value to the high side
of the transmitter.
5. To set the 20 mA point, press and hold the span button for at least two
seconds, then verify that the output is 20 mA. If a meter is installed, it
will display SPAN PASS.
NOTE
If the transmitter security jumper is in the ON position, or if the local zero and
span adjustments are disabled through the software, you will not be able to
make adjustments to the zero and span using the local buttons. Refer to
Figure 2-1 for the proper placement of the transmitter security jumper. Or refer
to “Local Span and Zero Control (Local Keys)” in Section 2 for instructions on
how to enable the span and zero buttons.
FIGURE 2-6. Local Zero and
Span Adjustments.
After you rerange the transmitter using the span and zero adjustments, it is
possible to disable the adjustments to prevent further reranging. Refer to
“Local Span and Zero Control (Local Keys)” below for
more information.
Span and Zero Adjustment Buttons