Emerson 2700, 1700 5.4.2Hazardous area mA output wiring, 7 Hazardous area mA output wiring

Output Wiring – Model 1700/2700 Intrinsically Safe Transmitters

5.4.2Hazardous area mA output wiring

Figure 5-7provides 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 5-7Hazardous area mA output wiring

Output Wiring – Intrinsically

Hazardous area

Safe area
	Vin
Rbarrier
	Vout
4-20 mA	Rload
	Ground

Note: Rbarrier and Rload should be added together to determine the proper Vin. Refer to Figure 5-2.

Safe

Output Wiring – Configurable I/O Output

5.4.3Hazardous 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 5-8utilizes 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 5-9utilizes a barrier with external load resistance.

Wiring – Fieldbus/PROFIBUS

Specifications

Installation Manual 39