Emerson Rosemount 3300 Series Manuel d'utilisateur Page 16

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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
I
)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)
U
E
: External Power
Supply Voltage (V dc)
U
I
: Input Voltage(V dc)
Non-Hazardous Installations
Maximum Load Resistance
Operating
Region
External Power
Supply Voltage
U
E
(V)
R (Ω)
R (Ω)
U
E
(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
U
E
(V)
R (Ω)
RS485 bus
U
I
: Input
Voltage(V dc)
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