Emerson Rosemount 3051CF Series Reference Manual page 98

Operation and maintenance
July 2020
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.
Upper and lower sensor trim is a two-point sensor calibration where two end-point
pressures are applied and all output is linearized between them; this calibration also
requires an accurate pressure source. Always adjust the low trim value first to establish the
correct offset. Adjustment of the high trim value provides a slope correction to the
characterization curve based on the low trim value. The trim values help optimize
performance over a specific measurement range.
Figure 5-1: Sensor Trim Example
A. Before trim
B. After trim
C. Zero/lower sensor trim
D. Pressure reading
E. Pressure input
F. Upper sensor trim
5.4.2 Perform a calibration or sensor trim
If you need to perform both an upper and lower sensor trim, do the lower trim first.
Performing a sensor trim
Note
For block oriented user interfaces, perform calibrations and trims in the sensor transducer
block.
Menu navigation: Overview → Calibration → Sensor Trim
You can perform all sensor trims and restore factory calibration using the Overview and
Service Tools branches of the menu tree. In addition, you can document calibrations and
trims with the information stored to an asset management system.
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Reference Manual
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Rosemount 3051