Reference Manual
00809-0100-4825, Rev BB
August 2005
Rosemount 248
www.rosemount.com
Appendix A Specifications and
Reference Data
Transmitter Specifications . . . . . . . . . . . . . . . . . . . . . . . . . page A-1
Sensor Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . page A-6
Dimensional Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . page A-8
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page A-10
TRANSMITTER
SPECIFICATIONS
Functional
Specifications
Inputs
User-selectable. See “Transmitter Accuracy and Ambient Temperature
Effects” on page A-5 for sensor options.
Output
2-wire 4–20 mA, linear with temperature or input; digital output signal
superimposed on 4–20 mA signal, available for a HART communicator or
control system interface
Isolation
Input/output isolation tested to 500 V ac rms (707 V dc) at 50/60 Hz
Power Supply
An external power supply is required. The transmitter operates on 12.0 to
42.4 V dc transmitter terminal voltage with load resistance between 250 and
1100 ohms. A minimum of 17.75 V dc power supply is required with a load of
250 ohms. Transmitter power terminals are rated to 42.4 V dc. A HART
Communicator requires a loop resistance between 250 and 1100 ohms. Do
not communicate with the transmitter when power is below 12 V dc at the
transmitter terminals.
Humidity Limits
0–99% relative humidity, non-condensing
NAMUR Recommendations
The Rosemount 248 meets the following NAMUR recommendations:
• NE 21 – Electromagnetic compatibility (EMC) for Process and
Laboratory Apparatus
• NE 43 – Standard of the signal level breakdown information of
digital transmitters
• NE 89 – Standard of temperature transmitters with digital
signal processing
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