Overview; Calibration For Hart Protocol; Section 4 Overview - Emerson Rosemount 3051S Series Reference Manual

Reference Manual
00809-0100-4801, Rev CB
January 2007
Section 4

OVERVIEW

CALIBRATION FOR
HART PROTOCOL
Operation and Maintenance
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4-1
Calibration for HART Protocol . . . . . . . . . . . . . . . . . . . . . . page 4-1
Field Upgrades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4-14
This section contains information on commissioning and operating 3051S
Pressure Transmitters. Tasks that should be performed on the bench prior to
installation are explained in this section.
Instructions for performing configuration functions are given for HART
Communicator version 1.8 and AMS version 7.0. For convenience, HART
Communicator fast key sequences are labeled "Fast Keys" for each software
function below the appropriate headings.
Calibrating a 3051S transmitter may include the following procedures:
• Rerange: Sets the 4 and 20 mA points at required pressures.
• Sensor Trim: Adjusts the position of the factory sensor characterization
curve to optimize performance over a specified pressure range, or to
adjust for mounting effects.
• Analog Output Trim: Adjusts the analog output to match the plant
standard or the control loop.
The 3051S SuperModule uses a microprocessor that contains information
about the sensor's specific characteristics in response to pressure and
temperature inputs. A smart transmitter compensates for these sensor
variations. The process of generating the sensor performance profile is called
factory sensor characterization. Factory sensor characterization also provides
the ability to readjust the 4 and 20 mA points without applying pressure to the
transmitter.
Trim and rerange functions also differ. Reranging sets analog output to the
selected upper and lower range points and can be done with or without an
applied pressure. Reranging does not change the factory sensor
characterization curve stored in the microprocessor. Sensor trimming requires
an accurate pressure input and adds additional compensation that adjusts the
position of the factory sensor characterization curve to optimize performance
over a specific pressure range.
NOTE
Sensor trimming adjusts the position of the factory sensor characterization
curve. It is possible to degrade performance of the transmitter if the trim is
done improperly or with inaccurate equipment.
Rosemount 3051S Series
4-1