Emerson Rosemount 3051S MultiVariable - Page 115

Lower Sensor Trim button under the Process Temperature Sensor Trim heading
and follow the on-screen prompts.
3. Adjust the calibrator/RTD simulator to a test point temperature value that
represents the maximum process temperature (for example, 140 °F or 60 °C). Select
the Upper Sensor Trim button under the Process Temperature Sensor Trim
heading and follow the on-screen prompts.
Recall factory trim
The Recall Factory Trim button will restore the transmitter to the original factory
characterization curve. The Recall Factory Trim button can be useful for recovering from
an inadvertent zero trim or inaccurate pressure source.
When the recall factory trim function is used, the transmitter’s upper and lower trim
values are set to the values configured at the factory. If custom trim values were specified
when the transmitter was ordered, the device will recall those values. If custom trim values
were not specified, the device will recall the upper and lower sensor limits.
Transmitter RTD sensor matching using Callendar-Van
Dusen constants
The Rosemount 3051SMV accepts Callendar-Van Dusen constants from a calibrated RTD
schedule and generates a special custom curve to match that specific sensor Resistance
vs. Temperature performance. Matching the specific sensor curve with the transmitter
configuration enhances the temperature measurement accuracy.
Under the Sensor Matching heading, the Callendar-Van Dusen constants R
0
, A, B, and C
can be viewed. If the Callendar-Van Dusen constants are known for the user’s specific Pt
100 RTD sensor, the constants R
0
, A, B, and C may be edited by selecting the Callendar-
Van Dusen Setup button and following the on-screen prompts. The user may also view the
α, β, and δ Coefficients by selecting the View Alpha, Beta, Delta button. The constants R
0
,
α, β, and δ may be edited by selecting the Callendar-Van Dusen Setup button and
following the on-screen prompts. To reset the transmitter to the IEC 751 Defaults, select
the Reset to IEC 751 Defaults button.
4.3.6
Analog calibration
Mass and energy flow Fast Keys 1, 2, 5, 2
Direct process variable output Fast Keys 1, 2, 4, 5
Reference Manual Operation and Maintenance
00809-0100-4803 October 2018
Emerson.com/Rosemount 115