Emerson Rosemount 248 Reference Manual page 34

Configuration
May 2019
3.4.3 Review configuration data
Before operating the Rosemount
configuration data to be sure that it reflects the current application.
When activating the Review function, scroll through the configuration data list to check
each process variable. If changes to the transmitter configuration data are necessary, refer
to Configuring the transmitter
3.4.4 Check output
Before performing other transmitter on-line operations, review the Rosemount
digital output parameters to be sure that the transmitter is operating properly.
The Process Variables menu displays continuously updated process variables, including
sensor temperature, percent of range, analog output, and terminal temperature. The
primary variable is the 4 –20 mA analog signal. The secondary variable is the transmitter
terminal temperature.
3.4.5 Configuring the transmitter
The Rosemount 248 must be configured for certain basic variables to be operational. In
many cases, these variables are pre-configured at the factory. Configuration may be
required if the transmitter is not configured, or if the configuration variables need revision.
Variable mapping
The Variable Mapping menu displays the sequence of the process variables. When using
the Rosemount 248 5 Variable Re-Map can be selected to change this configuration. When
the Select PV screen appears Snsr 1 must be selected. Either Sensor 1, Terminal
Temperature, or not used can be selected for the remaining variables. The primary
variable is the 4–20 mA analog signal.
Select sensor type
The Connections command allows selection of the sensor type and the number of sensor
wires to be connected. Select from the following sensors:
• 2-, 3-, or 4-wire Pt 100, Pt 200, Pt 500, Pt 1000 RTDs: α = 0.00385 Ω/°C
• 2-, 3-, or 4-wire Pt 100, Pt 200 (HART 7 only): α = 0.003916 Ω/°C
• 2-, 3-, or 4-wire Ni 120 nickel RTDs
• 2-, 3-, or 4-wire Cu 10 RTDs
• IEC/NIST/DIN Type B, E, J, K, R, S, T thermocouples
• DIN type L, U thermocouples
• ASTM Type W5Re/W26Re thermocouple
• –10 to 100 millivolts
• 2-, 3-, or 4-wire 0 to 2000 ohms
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248 in an actual installation, review all of the factory-set
below.
Rosemount 248 Temperature Transmitter Reference Manual
Reference Manual
00809-0100-4825
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