Hazardous Area Ma Output Wiring; Hazardous Area Frequency/Discrete Output Wiring - Emerson Micro Motion 2700 Installation Manual

Output Wiring – Model 1700/2700 IS Transmitters continued
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
Hazardous area
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.
Transmitter Installation: Model 1700 and 2700 Transmitters
Safe area
R
barrier
Note: R and R should be added together to
barrier load
determine the proper V . Refer to Figure 5-2.
in
V
in
V
out
R
4-20 mA
load
Ground
39