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March 2013
12
Quick Installation Guide
Step 3 continued...
Load limitations
The Field Communicator requires a minimum load resistance of 250 within the
loop to function properly. The maximum load resistance can be obtained from
the following diagrams.
NOTE:
For Flameproof / Explosion-proof installations, the diagram is only valid if the HART load resistance
is at the + side and if the - side is grounded. Otherwise, the load resistance value is limited to
435 .
NOTE:
Rosemount 5300 Series Transmitters with Flameproof/Explosion-proof output have a built-in
barrier; no external barrier needed.
R(): Maximum Load Resistance
U
E
(V): External Power Supply Voltage
Explosion-proof/Flameproof (Ex d)
Installations
Non-Hazardous Installations,
and Non-Sparking / Energy
Limited Power Supply
R(): Maximum Load Resistance
U
E
(V): External Power Supply Voltage
Operating
region
Operating
region
Intrinsically Safe Installations
R(): Maximum Load Resistance
U
E
(V): External Power Supply Voltage