Emerson 2400S Manuale di Installazione Scaricare il pdf (Pagina 19)

Installation Manual 15

I/O Wiring – Model 2400S Analog Transmitters

Power Supply I/O Wiring – DP and DNI/O Wiring – ANBefore You Begin

Figure 3-5 Required external voltage versus mA load resistance

Figure 3-6 HART multidrop wiring – Internal or external power

0 200 400 600 800 1000 1200

If communicating with HART, a minimum of 250 Ohms is required.

Total mA load resistance (Ohms)

Minimum required external voltage (Volts)

OPERATING REGION

HART-compatible

host or controller

HART-compatible

transmitter

SMART FAMILY

™

transmitter

Note: For optimum HART communication, make sure the output loop

is single-point-grounded to an instrument-grade ground.

24 VDC loop power

supply required for

HART 4–20 mA

passive transmitters

600 Ohm maximum resistance

250 Ohm minimum resistance

Model 2400S

External power

Model 2400S

Internal power

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Emerson 2400S Manuale di Installazione Pagina 19