Emerson 1700 Manuel D’Utilisation
Installation Manual
39
Output Wiring – Model 1700/2700 Intrinsically Safe Transmitters
O
u
tp
ut
Wi
ri
ut
Wi
ri
ng
– Con
– Con
fig
urab
le I
/O
S
p
e
ci
fication
s
Ou
tpu
tpu
t W
irin
g
irin
g
– Fiel
db
us/PR
us/PR
O
F
IB
U
S
Output Wiring – Intrinsica
ll
y Saf
e
5.4.2
Hazardous area mA output wiring
Figure 5-7 provides an example of basic hazardous area wiring for the Model 1700 transmitter’s mA
output or the Model 2700 transmitter’s primary mA output.
output or the Model 2700 transmitter’s primary mA output.
Figure 5-7
Hazardous area mA output wiring
5.4.3
Hazardous area frequency/discrete output wiring
The following frequency/discrete output wiring diagrams are examples of proper hazardous area
wiring for the Model 1700 transmitter’s frequency output or the Model 2700 transmitter’s
frequency/discrete output:
wiring for the Model 1700 transmitter’s frequency output or the Model 2700 transmitter’s
frequency/discrete output:
•
The diagram in Figure 5-8 utilizes a galvanic isolator that has an internal 1000
Ω resistor used
for sensing current:
-
ON > 2.1 mA
-
OFF < 1.2 mA
•
The diagram in Figure 5-9 utilizes a barrier with external load resistance.
Note: R
barrier
and R
load
should be added together to
determine the proper V
in
. Refer to Figure 5-2.
V
out
Hazardous area
Safe area
V
in
Ground
R
load
4-20 mA
R
barrier