Reference Manual
00809-0100-4022, Rev AA
July 2002
Model 4600
www.rosemount.com
Section 4
Operation and Maintenance
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4-1
Calibration for HART Protocol . . . . . . . . . . . . . . . . . . . . . . page 4-1
Sensor Trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4-5
Recall Factory Trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4-8
Analog Output Trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4-9
OVERVIEW
This section contains information on operation and maintenance of the Model
4600 transmitter.
HART Communicator and AMS instructions are given to perform maintenance
functions. For convenience, HART Communicator fast key sequences are
labeled “Fast Keys” for each software function below the appropriate
headings.
CALIBRATION FOR
HART PROTOCOL
Calibrating a Model 4600 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 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 Model 4600 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
characterization. Factory characterization also provides the ability to readjust
the 4 and 20 mA points without applying pressure to the transmitter.
Trim and rerange functions differ significantly. 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 characterization
curve stored in the microprocessor. Sensor trimming requires an accurate
pressure input and adds additional compensation that adjusts the position of
the factory characterization curve to optimize performance over a specific
pressure range.
NOTE
Sensor trimming adjusts the position of the factory characterization curve. It is
possible to degrade performance of the transmitter if the trim is done
improperly or with inaccurate equipment.
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