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Reference Manual
00809-0100-4102, Rev AA
Section 5: Operation and Maintenance
May 2013
Operation and maintenance
5.4.3 Recall Factory Trim—Sensor Trim
The Recall Factory Trim—Sensor Trim command allows the restoration of the as-shipped factory
settings of the Sensor Trim. This command can be useful for recovering from an inadvertent zero
trim of an absolute pressure unit or inaccurate pressure source.
Recalling factory trim with AMS
Right click on the device and, under the Method drop down menu, move cursor over Calibrate
and select Restore Factory Calibration.
1. Click Next after setting the control loop to manual.
2. Select Sensor Trim under Trim to recall and click Next.
3. Follow the screen prompts to recall Sensor Trim.
5.4.4 Line Pressure Effect (Range 2 and Range 3)
The following specifications show the static pressure effect for the Rosemount 2051 Range 2
and Range 3 pressure transmitters used in differential pressure applications where line pressure
exceeds 2000 psi (138 bar).
Zero Effect
± 0.1% of the upper range limit plus an additional ± 0.1% of upper range limit error for each 1000
psi (69 bar) of line pressure above 2000 psi (138 bar).
Example: Line pressure is 3000 psi (207 bar) for Ultra performance transmitter. Zero effect error
calculation:
± {0.05 + 0.1 x [3 kpsi - 2 kpsi]} = ± 0.15% of the upper range limit
Span Effect
Refer to “Line Pressure Effect” on page 91.
5.4.5 Compensating for Line Pressure (Range 4 and Range 5)
The Rosemount 2051 Wireless Range 4 and 5 pressure transmitters require a special calibration
procedure when used in differential pressure applications. The purpose of this procedure is to
optimize transmitter performance by reducing the effect of static line pressure in these
applications. The 2051 Wireless differential pressure transmitters (Ranges 1, 2, and 3) do not
require this procedure because optimization occurs in the sensor.
Applying high static pressure to the 2051 Wireless Range 4 and Range 5 pressure transmitters
causes a systematic shift in the output. This shift is linear with static pressure; correct it by
performing the “Sensor Trim” procedure on page 68.
The following specifications show the static pressure effect for the 2051 Wireless Range 4 and
Range 5 transmitters used in differential pressure applications: