Emerson Rosemount 3300 Series Manual do Utilizador descarregar pdf (Página 16)

Product Data Sheet

00813-0100-4811, Rev DA

Catalog 2008 - 2009

Rosemount 3300 Series

Level-16

POWER SUPPLY

4-20 mA with HART

The input voltage (U

)for HART

is 11-42 V dc

(11-30 V dc in IS applications, and 16-42 V dc in

Explosionproof / Flameproof applications).

The maximum load resistance and power supply

limitations for typical operating conditions can be

obtained from the following diagrams and table.

Modbus

The input voltage for Modbus is 8-30 V dc.

R: Load Resistance (Ω)

: External Power

Supply Voltage (V dc)

: Input Voltage(V dc)

Non-Hazardous Installations

Maximum Load Resistance

Operating

Region

External Power

Supply Voltage

(V)

R (Ω)

(V)

Operating

Region

Intrinsically Safe Installations

Maximum Load Resistance

External Power

Supply Voltage

External Power

Supply Voltage

Explosionproof / Flameproof (Ex d) Installations

NOTE

For the Ex d case, the diagram is only valid if the

HART

load resistance is at the + side, otherwise

the load resistance value is limited to 300 Ohm.

Maximum Load Resistance

Operating

Region

(V)

R (Ω)

RS485 bus

: Input

Voltage(V dc)

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 37 38

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