Emerson Rosemount 8712EM Quick Start Manual page 25

November 2017
Figure 5-12:
0.25
0.2
0.15
A
0.1
0.05
0
10
A. Supply current (amps)
B. Power supply (VDC)
Supply wire requirements
Use 10–18 AWG wire rated for the proper temperature of the application. For
wire 10–14 AWG use lugs or other appropriate connectors. For connections
in ambient temperatures above 122 °F (50 °C), use a wire rated for 194 °F
(90 °C). For DC powered transmitters with extended cable lengths, verify that
there is a minimum of 12VDC at the terminals of the transmitter with the
device under load.
Electrical disconnect requirements
Connect the device through an external disconnect or circuit breaker per
national and local electrical code.
Installation category
The installation category for the transmitter is OVERVOLTAGE CAT II.
Overcurrent protection
The transmitter requires overcurrent protection of the supply lines. Fuse
rating and compatible fuses are shown in
Table 5-6:
Power system
AC power
DC power
Quick Start Guide
Low power DC current requirements
15
Fuse requirements
Power supply
90–250VAC
12–42VDC
20 25
B
Table 5-6.
Fuse rating
2 Amp quick acting
3 Amp quick acting
Quick Start Guide
30
Manufacturer
Bussman AGC2 or
equivalent
Bussman AGC3 or
equivalent
25