Prepare The Electrical Connections - Emerson Rosemount 5400 Quick Start Manual

June 2017
4.0

Prepare the electrical connections

4.1 Cable selection
Use shielded twisted pair wiring (18-12 AWG).
For the RS-485 bus, use shielded twisted pair wiring, preferably with an
impedance of 120  (typically 24 AWG).
4.2 Cable gland/conduit
For explosion-proof/ flameproof installations, only use cable glands or conduit
entry devices certified explosion-proof or flameproof.
4.3 Power supply (Vdc)
Approval type
None
Non-sparking/Energy limited
Intrinsically safe
FISCO
Explosion-proof/Flameproof
4.4 4-20 mA/HART communication
Figure 1. Wiring Diagram
A. Field Communicator
B. Approved IS barrier
(for Intrinsically Safe installations only)
C. HART modem
Note
Rosemount 5400 Level Transmitters with Flameproof/Explosion-proof output have a
built-in barrier; no external barrier needed.
HART F
OUNDATION
16 - 42.4 9 - 32
16 - 42.4 9 - 32
16 - 30 9 - 30
N/A 9 - 17.5
20 - 42.4 16 - 32
Quick Start Guide
Fieldbus RS-485 with Modbus
8-30 (max. rating)
N/A
N/A
N/A
8-30 (max. rating)
A
C
1 2 3
4 5 6
7 8 9
0
D
B
D. Current meter
Load resistance (≥250 
E.
F. Power supply
F
E
11