Emerson Rosemount 5408 Reference Manual page 169

Reference Manual
00809-0100-4408
HART Revision
• Revision 6 (default)
• Revision 7 (option code HR7)
The HART revision can be switched in field.
Power supply
Transmitter operates on 12-42.4 Vdc transmitter terminal voltage (12-30 Vdc in
Intrinsically Safe installations).
Power consumption
Max. 1 W, current max. 23 mA
Load limitations
For HART
loop resistance is determined by the voltage level of the external power supply.
Figure A-3: Load Limits
Maximum Loop Resistance = 43.5 * (External Power Supply Voltage - 12)
A. Loop Resistance (Ohms)
B. External Power Supply Voltage (Vdc)
Cable selection
Use 24-14 AWG wire. Twisted pairs and shielded wiring are recommended for
environments with high EMI (electromagnetic interference).
Use wire rated at least 5 °C above maximum ambient temperature.
Two wires can be safely connected to each terminal screw.
Rosemount 5408 and 5408:SIS Level Transmitters
®
communication, a minimum loop resistance of 250 Ω is required. Maximum
Specifications and reference data
February 2020
169