Emerson 1700 用户手册
40
Micro Motion
®
Model 1700 and 2700 Transmitters
Output Wiring – Model 1700/2700 Intrinsically Safe Transmitters
Figure 5-8
Hazardous area frequency/discrete output wiring using galvanic isolator
Figure 5-9
Hazardous area frequency/discrete output wiring using barrier with external load resistance
External power supply
R
load
V
out
Galvanic isolator
Hazardous area
Safe area
COUNTER
Note: R
barrier
and R
load
should be added together to
determine the proper V
in
Hazardous area
Safe area
Ground
V
out
V
in
R
barrier
R
load
COUNTER