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Reference Manual
00809-0100-4021, Rev DA
November 2004
Rosemount 3144P
4-20
FOUNDATION Fieldbus
OPERATION
Overview This section contains information on operation and maintenance procedures.
METHODS AND MANUAL OPERATION
Each F
OUNDATION fieldbus host or configuration tool has different ways of
displaying and performing operations. Some hosts will use DD Methods to
complete device configuration and will display data consistently across
platforms. There is no requirement that a host or configuration tool support
these features.
In addition, if your host or configuration tool does not support methods this
section will cover manually configuring the parameters involved with each
method operation. For more detailed information on the use of methods, see
your host or configuration tool manual.
Trim the Transmitter Calibrating the transmitter increases the precision of your measurement
system. The user may use one or more of a number of trim functions when
calibrating. The trim functions allow the user to make adjustments to the
factory-stored characterization curve by digitally altering the transmitter’s
interpretation of the sensor input.
Figure 4-1. Trim
.
Application: Linear Offset Application: Linear Offset and Slope Correction
Solution: Single-Point Trim Solution: Two-Point Trim
Method:
1. Connect sensor to transmitter. Place
sensor in bath between range points.
2. Enter known bath temperature using
the 375 Field Communicator.
Method:
1. Connect sensor to transmitter. Place
sensor in bath at low range point.
2. Enter known bath temperature using the
375 Field Communicator.
3. Repeat at high range point.
One-Point Trim Two-Point Trim
Transmitter System Curve
Site-Standard Curve
Resistance (ohms)
Temperature
Resistance (ohms)
Tem
p
erature