Safe area mA output load resistance valuesFigure 8-4:
1000
900
800
700
600
500
400
300
200
100
0
12 14 16 18 20 22 24 26 28 30
OPERATING REGION
Supply voltage VDC (Volts)
External resistor R
load
(Ohms)
R
max
= (V
supply
– 12)/0.023
Min. 250Ω and 17.5V required for HART communication
8.3 Safe area HART multidrop wiring
Tip
For optimum HART communication, single-point ground the output loop to an instrument-grade
ground.
Safe area HART multidrop wiringFigure 8-5:
A. 250–600 Ω resistance
B. HART-compatible host or controller
C. HART-compatible transmitters
D. Model 1700 or Model 2700 transmitter with intrinsically safe outputs
E. SMART FAMILY transmitter
F. 24 VDC loop power supply required for HART 4–20 mA passive transmitters
I/O wiring for Model 1700 and Model 2700 transmitters with intrinsically safe outputs
Installation Manual 83
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