Sensor Trim Overview - Emerson Rosemount 2051 Wireless Series Reference Manual

Section 5: Operation and Maintenance
June 2012
Table 5-1. Recommended Calibration Tasks
Transmitter Bench Calibration Tasks
1.
3051CD
3051CG
3051L
3051TG, Range
1-4
2.
1.
3051CA
3051TA
3051TG, Range 5
2.
Note:
A Field Communicator or AMS is required for all sensor and output trim procedures.
Rosemount 3051C Range 4 and Range 5 transmitters require a special calibration procedure
when used in differential pressure applications under high static line pressure.
5.2.1

Sensor Trim Overview

Trim the sensor using either sensor or zero trim functions. Trim functions vary in complexity and
are application-dependent. Both trim functions alter the transmitter's interpretation of the
input signal.
Zero trim is a single-point offset adjustment. It is useful for compensating for mounting position
effects and is most effective when performed with the transmitter installed in its final mounting
position. Since this correction maintains the slope of the characterization curve, it should not be
used in place of a sensor trim over the full sensor range.
When performing a zero trim, ensure that the equalizing valve is open and all wet legs are filled
to the correct levels.
Note
Do not perform a zero trim on 3051 Wireless absolute pressure transmitters. Zero trim is zero
based, and absolute pressure transmitters reference absolute zero. To correct mounting
position effects on a 3051 Wireless absolute pressure transmitter, perform a low trim within the
sensor trim function. The low trim function provides an offset correction similar to the zero trim
function, but it does not require zero-based input.
52
Set output configuration parameters:
a. Set the range points.
b. Set the output units.
c. Set the output type.
d. Set the damping value.
Optional: Perform a sensor trim.
(Accurate pressure source required.)
Set output configuration parameters:
a. Set the range points.
b. Set the output units.
c. Set the output type.
d. Set the damping value.
Optional: Perform a sensor trim if
equipment available (accurate
absolute pressure source required),
otherwise perform the low trim value
section of the sensor trim procedure.
00809-0100-4100, Rev AA
Field Calibration Tasks
1. Reconfigure parameters if
necessary.
2. Zero trim the transmitter to
compensate for mounting effects
or static pressure effects.
3. Optional: Perform an analog output
trim. (Accurate multimeter
required)
1. Reconfigure parameters if
necessary.
2. Perform low trim value section of
the sensor trim procedure to
correct for mounting position
effects.
3. Optional: Perform an analog output
trim (Accurate multimeter
required)
Operation and Maintenance
Reference Manual