Rosemount 8712, Reference Manual

Page: 116 / 212

Reference Manual
00809-0100-4664, Rev BA
January 2010
Rosemount 8712
A-2
DC Load Limitations (Analog Output)
Maximum loop resistance is determined by the voltage level of the external
power supply, as described by:
FIGURE 1. DC Load Limitations
NOTE
Field Communication requires a minimum loop resistance of 250 ohms.
Supply Current Requirements
Units powered by 12-42 V DC power supply may draw up to 1 amp of current
steady state.
FIGURE 2. DC Current Requirements
Power Consumption
10 watts maximum
Ambient Temperature Limits
Operating
-20 to 140 °F (-29 to 60 °C) with local operator interface
-40 to 165 °F (-40 to 74 °C) without local operator interface
Storage
–40 to 176 °F (–40 to 80 °C)
R
max
= 41.7(V
ps
– 10.8)
V
ps
= Power Supply Voltage (Volts)
R
max
= Maximum Loop Resistance (Ohms)
Power Supply (Volts)
Lo
ad (Oh
m
s)
Operating
Region
1250
1000
500
0
10.8
42
12 18 24 30 36 42
0.0
0.3
0.8
1.0
0.5
Power Supply (Volts)
Sup
p
ly C
u
rrent (Am
p
s
)