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Reference Manual
00809-0100-4808, Rev CA
June 2008
Rosemount 3051N
2-14
Smart transmitters operate differently than analog transmitters. A smart
transmitter uses a microprocessor and sensor memory that contains
information about the sensor’s specific characteristics in response to pressure
and temperature inputs. A smart transmitter compensates for these sensor
variations. The process of generating the sensor performance profile is called
factory characterization. Factory characterization also provides the ability to
readjust the 4 and 20 mA points without applying pressure to the transmitter.
The trim and rerange functions also differ. Reranging sets the transmitter
analog output to the selected upper and lower range points and can be done
with or without an applied pressure. Reranging does not change the factory
characterization curve stored in the microprocessor. Sensor trimming requires
an accurate pressure input and adds additional compensation that adjusts the
position of the factory characterization curve to optimize transmitter
performance over a specific pressure range.
NOTE
Sensor trimming adjusts the position of the factory characterization curve. It is
possible to degrade the performance of the transmitter if the sensor trim is
done improperly or with inaccurate equipment. Contact Rosemount Nuclear
Instruments, Inc. at 952-949-5210 if you have questions.
Table 2-2. Recommended
Calibration Tasks.
Transmitter Bench Calibration Tasks Field Calibration Tasks
3051ND
3051NG
1. Set output configuration parameters:
a. Set the process variable units.
b. Set the output type.
c. Set the range points.
d. Set the damping value.
2. Optional: Perform a full sensor trim. (Accurate
multimeter required.)
3. Optional: Perform an analog output trim. (Accurate
multimeter required.)
1. Reconfigure parameters if necessary.
2. Zero trim the transmitter to compensate for mounting
effects or static pressure effects.
3051NA
1. Set output configuration parameters:
a. Set the process variable units.
b. Set the output type.
c. Set the range points.
d. Set the damping value.
2. Optional: Perform a full sensor trim if equipment
available (accurate absolute pressure source
required), otherwise perform the low trim value section
of the full sensor trim procedure.
3. Optional: Perform an analog output trim (accurate
multimeter required).
1. Reconfigure parameters if necessary.
2. Perform low trim value section of the full sensor trim
procedure to correct for mounting position effects.
Notes:
• A HART Communicator is required for all sensor and output trim procedures.
• Rosemount 3051N Range 4 and Range 5 transmitters require a special calibration procedure when used
in differential pressure applications under high static line pressure (see “Compensating Rosemount 3051N
Range 4 and 5 Differential Transmitters for Line Pressure” on page 2-20).