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Section 5: Operation and Maintenance
May 2013
Table 5-1. Recommended Calibration Tasks
Transmitter
Bench Calibration Tasks
1.
3051S 2CD
3051S 2CG
3051S 2L
2.
1.
3051S 2CA
3051S 2TA
3051S 2TG
2.
Note:
A 375 Field Communicator or AMS is required for all sensor and output trim procedures.
Rosemount 3051S2TG Range 5 transmitters use an absolute sensor that requires an accurate
absolute pressure source to perform the optional sensor trim.
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 3051S Wireless absolute pressure transmitters. Zero trim is zero
based, and absolute pressure transmitters reference absolute zero. To correct mounting
position effects on a 3051S 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.
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.
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.
Reference Manual
00809-0200-4802, Rev BA
Field Calibration Tasks
1.
Reconfigure parameters if necessary.
2.
Zero trim the transmitter to
compensate for mounting effects or
static pressure effects.
1.
Reconfigure parameters if necessary.
2.
Perform low trim value section of the
sensor trim procedure to correct for
mounting position effects.
Operation and Maintenance
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