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Installation Manual 39
Output Wiring – Model 1700/2700 Intrinsically Safe Transmitters
Output Wiring – Configurable I/O SpecificationsOutput Wiring – Fieldbus/PROFIBUSOutput Wiring – Intrinsically Safe
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.
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:
• 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