Emerson Rosemount 3051P Reference Manual page 66

Operation and maintenance
April 2020
5.4.1 Determine necessary sensor trims
Bench calibrations allow for calibrating the instrument for its desired range of operation.
Straight forward connections to pressure source allow for a full calibration at the planned
operating points. Exercising the transmitter over the desired pressure range allows for
verification of the analog output.
Trimming the pressure signal
possible to degrade the performance of the transmitter if a trim is done improperly or with
inaccurate equipment. To set the transmitter back to factory settings, see
trim—sensor
Procedure
1. Apply pressure.
2. Check digital pressure; if the digital pressure does not match the applied pressure,
3. Check reported analog output against the live analog output. If they do not match,
Trim with configuration buttons
Local configuration buttons are external buttons located underneath the top tag of the
transmitter. There are two possible sets of local configuration buttons you can order with
the transmitter and use to perform trim operations: Digital zero trim and LOI.
Procedure
To access the buttons, loosen screw and rotate top tag until buttons are visible.
• LOI (M4): Can perform both digital sensor trim and the 4–20 mA output trim (analog
output trim). Follow the same procedures listed in trimming with Field Communicator
or AMS Device Manager listed below.
• Analog zero and span (D4): Used to rerange the transmitter with an applied pressure.
• Digital zero trim (DZ): Used for performing a sensor zero trim. See
calibration frequency
Monitor all configuration changes either on the display or by measuring the loop output..
Figure 5-1
66
outlines how the trim operations change the calibration. It is
trim. Determine the necessary trims with the following steps.
perform a digital trim.
See Performing a sensor trim
perform an analog output trim.
See Performing digital-to-analog trim (4–20mA output
for trim instructions.
shows the physical differences between the two sets of buttons.
.
Reference Manual
00809-0700-4001
Recall factory
trim).
Determine
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