Cable Selection; Cable Gland/Conduit; Power Supply; Hazardous Areas - Emerson Rosemount 5408 Reference Manual

Level transmitters. non-contacting radar
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Electrical Installation
November 2017
4.2

Cable selection

Use 24-14 AWG wire. Twisted pairs and shielded wiring are recommended for environments with high
EMI (electromagnetic interference).
The cables must be suitable for the supply voltage and approved for use in hazardous areas, where
applicable. Two wires can be safely connected to each terminal screw.
4.3

Cable gland/conduit

For explosion-proof/flameproof installations, only use cable glands or conduit entry devices certified
explosion-proof or flameproof.
4.4

Power supply

The transmitter operates on 12-42.4 Vdc (12-30 Vdc in Intrinsically Safe installations) at the transmitter
terminals.
For HART
determined by the voltage level of the external power supply, as described by
Figure 4-1. Load Limits
Maximum Loop Resistance = 43.5 * (External Power Supply Voltage - 12)
1400
1200
1000
800
600
400
200
4.5

Hazardous areas

When the transmitter is installed in hazardous areas, local regulations, and specifications in applicable
certificates must be observed. See
60
communication, a minimum loop resistance of 250  is required. Maximum loop resistance is
®
1322
782
521
250
0
17.8
12
20
External Power Supply Voltage (Vdc)
24
42.4
30
40
Appendix B: Product Certifications
Reference Manual
00809-0100-4408, Rev BA
Figure
4-1.
50
for more information.
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