Emerson Rosemount 644 Reference Manual page 76

Section 4: Operation and Maintenance
April 2015
Figure 4-4. Load Limits
Maximum Load = 40.8 X (Supply Voltage - 12.0)
1240
1100
1000
750
500
250
0
66
4–20 mA dc
Operating
Region
10 20 30 40 42.4
12.0
Supply Voltage (Vdc)
Reference Manual
00809-0200-4728, Rev RA
Electrical Installation