Emerson Rosemount 8712EM Quick Start Manual page 24

Quick Start Guide
Figure 5-10:
34
32
30
28
A
26
24
22
20
90
A. Apparent power (VA)
B. Power supply (VAC)
DC power supply requirements
Standard DC units powered by 12VDC power supply may draw up to 1.2A of
current steady state. Low power DC units may draw up to 0.25A of current
steady state. Peak inrush is 42A at 42VDC supply, lasting approximately 1ms.
Inrush for other supply voltages can be estimated with: Inrush (Amps) =
Supply (Volts) / 1.0
Figure 5-11:
1.2
1.1
1.0
0.9
0.8
A
0.7
0.6
0.5
0.4
0.3
0.2
12
A. Supply current (amps)
B. Power supply (VDC)
24
Apparent power
110 130 150
DC current requirements
17 22
170 190
B
27 32
B
Rosemount 8712EM Transmitter with HART Protocol
November 2017
210 230 250
37 42